[5378] kea-dhcp4/6 now keep track of their configured global params

src/bin/dhcp4/json_config_parser.cc
    configureDhcp4Server() - added extract of configured globals

src/bin/dhcp4/tests/get_config_unittest.cc
src/bin/dhcp6/tests/get_config_unittest.cc
    Updated extracted and unparsed configs.

src/bin/dhcp6/json_config_parser.cc
    configureDhcp6Server() - added extract of configured globals

src/lib/dhcpsrv/srv_config.h
src/lib/dhcpsrv/srv_config.cc
    Added storage and maintence of configured globals
    SrvConfig::toElement() - added configured globals to result

src/lib/dhcpsrv/tests/srv_config_unittest.cc
    TEST_F(SrvConfigTest, configuredGlobals) - new test

7 files changed, 561 insertions, 106 deletions

diff --git a/src/bin/dhcp4/json_config_parser.cc b/src/bin/dhcp4/json_config_parser.cc
index 6ee88509b0..646091cd09 100644
--- a/src/bin/dhcp4/json_config_parser.cc
+++ b/src/bin/dhcp4/json_config_parser.cc
@@ -316,6 +316,9 @@ configureDhcp4Server(Dhcpv4Srv& server, isc::data::ConstElementPtr config_set,
 
         SrvConfigPtr srv_cfg = CfgMgr::instance().getStagingCfg();
 
+        // Preserve all scalar global parameters
+        srv_cfg->extractConfiguredGlobals(config_set);
+
         // This is a way to convert ConstElementPtr to ElementPtr.
         // We need a config that can be edited, because we will insert
         // default values and will insert derived values as well.
diff --git a/src/bin/dhcp4/tests/get_config_unittest.cc b/src/bin/dhcp4/tests/get_config_unittest.cc
index 40006fe256..ca2affa5a4 100644
--- a/src/bin/dhcp4/tests/get_config_unittest.cc
+++ b/src/bin/dhcp4/tests/get_config_unittest.cc
@@ -1203,7 +1203,7 @@ const char* EXTRACTED_CONFIGS[] = {
 "                ],\n"
 "                \"rebind-timer\": 2,\n"
 "                \"relay\": {\n"
-"                    \"ip-addresses\": [ \"192.0.2.123\", \"192.0.2.124\" ]\n"
+"                    \"ip-addresses\": [ \"192.0.3.123\", \"192.0.3.124\" ]\n"
 "                },\n"
 "                \"renew-timer\": 1,\n"
 "                \"subnet\": \"192.0.2.0/24\",\n"
@@ -1896,8 +1896,11 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
-"        \"subnet4\": [ ]\n"
+"        \"subnet4\": [ ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 1
 "{\n"
@@ -1939,6 +1942,7 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -1966,7 +1970,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 2
 "{\n"
@@ -2008,6 +2013,7 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -2035,7 +2041,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 3
 "{\n"
@@ -2077,6 +2084,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -2105,7 +2114,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 4
 "{\n"
@@ -2147,6 +2157,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -2253,7 +2265,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.5.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 5
 "{\n"
@@ -2295,6 +2308,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -2401,10 +2416,12 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.5.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 6
 "{\n"
+"        \"boot-file-name\": \"bar\",\n"
 "        \"decline-probation-period\": 86400,\n"
 "        \"dhcp-ddns\": {\n"
 "            \"always-include-fqdn\": false,\n"
@@ -2441,8 +2458,12 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
 "        },\n"
+"        \"next-server\": \"1.2.3.4\",\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
+"        \"server-hostname\": \"foo\",\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -2471,7 +2492,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 7
 "{\n"
@@ -2513,6 +2535,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -2541,10 +2565,12 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 8
 "{\n"
+"        \"boot-file-name\": \"nofile\",\n"
 "        \"decline-probation-period\": 86400,\n"
 "        \"dhcp-ddns\": {\n"
 "            \"always-include-fqdn\": false,\n"
@@ -2581,8 +2607,12 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
 "        },\n"
+"        \"next-server\": \"192.0.0.1\",\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
+"        \"server-hostname\": \"nohost\",\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -2611,7 +2641,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 9
 "{\n"
@@ -2653,6 +2684,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -2681,7 +2714,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 10
 "{\n"
@@ -2723,6 +2757,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -2751,7 +2787,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 11
 "{\n"
@@ -2793,6 +2830,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -2847,7 +2886,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.3.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 12
 "{\n"
@@ -2887,8 +2927,11 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"lease-database\": {\n"
 "            \"type\": \"memfile\"\n"
 "        },\n"
+"        \"match-client-id\": true,\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -2943,7 +2986,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.3.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 13
 "{\n"
@@ -2985,6 +3029,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -3013,7 +3059,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 14
 "{\n"
@@ -3055,6 +3102,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -3117,7 +3166,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.3.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 15
 "{\n"
@@ -3159,6 +3209,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -3187,7 +3239,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 16
 "{\n"
@@ -3626,6 +3679,8 @@ const char* UNPARSED_CONFIGS[] = {
 "            }\n"
 "        ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -3654,7 +3709,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 24
 "{\n"
@@ -3696,6 +3752,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -3741,7 +3799,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 25
 "{\n"
@@ -3810,6 +3869,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"type\": \"uint32\"\n"
 "            }\n"
 "        ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -3838,7 +3899,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 26
 "{\n"
@@ -3916,8 +3978,11 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"type\": \"ipv4-address\"\n"
 "            }\n"
 "        ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
-"        \"subnet4\": [ ]\n"
+"        \"subnet4\": [ ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 27
 "{\n"
@@ -4012,6 +4077,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"type\": \"ipv4-address\"\n"
 "            }\n"
 "        ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -4040,7 +4107,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 3000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 3000\n"
 "    }\n",
     // CONFIGURATION 28
 "{\n"
@@ -4091,6 +4159,8 @@ const char* UNPARSED_CONFIGS[] = {
 "            }\n"
 "        ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -4136,7 +4206,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 29
 "{\n"
@@ -4178,6 +4249,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -4250,7 +4323,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.3.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 30
 "{\n"
@@ -4292,6 +4366,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -4337,7 +4413,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 31
 "{\n"
@@ -4379,6 +4456,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -4429,7 +4508,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 32
 "{\n"
@@ -4488,6 +4568,8 @@ const char* UNPARSED_CONFIGS[] = {
 "            }\n"
 "        ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -4516,7 +4598,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 33
 "{\n"
@@ -4594,8 +4677,11 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"type\": \"ipv4-address\"\n"
 "            }\n"
 "        ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
-"        \"subnet4\": [ ]\n"
+"        \"subnet4\": [ ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 34
 "{\n"
@@ -4681,6 +4767,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"type\": \"ipv4-address\"\n"
 "            }\n"
 "        ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -4709,7 +4797,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 3000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 3000\n"
 "    }\n",
     // CONFIGURATION 35
 "{\n"
@@ -4766,6 +4855,8 @@ const char* UNPARSED_CONFIGS[] = {
 "            }\n"
 "        ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -4794,7 +4885,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 36
 "{\n"
@@ -4855,6 +4947,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"type\": \"string\"\n"
 "            }\n"
 "        ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -4883,7 +4977,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 37
 "{\n"
@@ -4925,8 +5020,11 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
-"        \"subnet4\": [ ]\n"
+"        \"subnet4\": [ ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 38
 "{\n"
@@ -4968,8 +5066,11 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
-"        \"subnet4\": [ ]\n"
+"        \"subnet4\": [ ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 39
 "{\n"
@@ -5011,6 +5112,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -5039,7 +5142,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 40
 "{\n"
@@ -5081,6 +5185,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -5109,7 +5215,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 41
 "{\n"
@@ -5151,6 +5258,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -5170,7 +5279,7 @@ const char* UNPARSED_CONFIGS[] = {
 "                ],\n"
 "                \"rebind-timer\": 2,\n"
 "                \"relay\": {\n"
-"                    \"ip-addresses\": [ \"192.0.2.123\", \"192.0.2.124\" ]\n"
+"                    \"ip-addresses\": [ \"192.0.3.123\", \"192.0.3.124\" ]\n"
 "                },\n"
 "                \"renew-timer\": 1,\n"
 "                \"reservation-mode\": \"all\",\n"
@@ -5179,7 +5288,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 42
 "{\n"
@@ -5221,6 +5331,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -5330,7 +5442,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.5.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 43
 "{\n"
@@ -5372,6 +5485,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -5415,7 +5530,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.0.0/16\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 44
 "{\n"
@@ -5457,6 +5573,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -5640,7 +5758,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.4.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 45
 "{\n"
@@ -5692,6 +5811,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"type\": \"uint32\"\n"
 "            }\n"
 "        ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -5740,7 +5861,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.3.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 46
 "{\n"
@@ -5782,6 +5904,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -5888,7 +6012,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.5.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 47
 "{\n"
@@ -6102,6 +6227,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -6130,7 +6257,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 52
 "{\n"
@@ -6172,6 +6300,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -6200,7 +6330,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 53
 "{\n"
@@ -6242,6 +6373,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -6270,7 +6403,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 54
 "{\n"
@@ -6312,6 +6446,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -6340,7 +6476,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 55
 "{\n"
@@ -6382,6 +6519,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -6410,7 +6549,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 56
 "{\n"
@@ -6478,6 +6618,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -6506,7 +6648,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 57
 "{\n"
@@ -6548,6 +6691,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -6576,7 +6721,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 58
 "{\n"
@@ -6618,6 +6764,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -6647,7 +6795,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 59
 "{\n"
@@ -6689,6 +6838,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -6722,7 +6873,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 60
 "{\n"
@@ -6764,6 +6916,8 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
 "        \"subnet4\": [\n"
 "            {\n"
@@ -6797,7 +6951,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"192.0.2.0/24\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 61
 "{\n"
@@ -6853,8 +7008,11 @@ const char* UNPARSED_CONFIGS[] = {
 "        },\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"rebind-timer\": 2000,\n"
+"        \"renew-timer\": 1000,\n"
 "        \"shared-networks\": [ ],\n"
-"        \"subnet4\": [ ]\n"
+"        \"subnet4\": [ ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 62
 "{\n"
diff --git a/src/bin/dhcp6/json_config_parser.cc b/src/bin/dhcp6/json_config_parser.cc
index 4d28b3781d..70ce51c59a 100644
--- a/src/bin/dhcp6/json_config_parser.cc
+++ b/src/bin/dhcp6/json_config_parser.cc
@@ -419,6 +419,9 @@ configureDhcp6Server(Dhcpv6Srv& server, isc::data::ConstElementPtr config_set,
 
         SrvConfigPtr srv_config = CfgMgr::instance().getStagingCfg();
 
+        // Preserve all scalar global parameters
+        srv_config->extractConfiguredGlobals(config_set);
+
         // Set all default values if not specified by the user.
         SimpleParser6::setAllDefaults(mutable_cfg);
 
diff --git a/src/bin/dhcp6/tests/get_config_unittest.cc b/src/bin/dhcp6/tests/get_config_unittest.cc
index 55cfc62390..82f56b0564 100644
--- a/src/bin/dhcp6/tests/get_config_unittest.cc
+++ b/src/bin/dhcp6/tests/get_config_unittest.cc
@@ -984,7 +984,7 @@ const char* EXTRACTED_CONFIGS[] = {
 "                    }\n"
 "                ],\n"
 "                \"relay\": {\n"
-"                    \"ip-addresses\": [ \"2001:db8:1::abcd\", \"2001:db8:1::abce\" ]\n"
+"                    \"ip-addresses\": [ \"2001:db9::abcd\", \"2001:db9::abce\" ]\n"
 "                },\n"
 "                \"subnet\": \"2001:db8:1::/64\"\n"
 "            }\n"
@@ -1772,7 +1772,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -1782,7 +1785,8 @@ const char* UNPARSED_CONFIGS[] = {
 "            \"type\": \"LLT\"\n"
 "        },\n"
 "        \"shared-networks\": [ ],\n"
-"        \"subnet6\": [ ]\n"
+"        \"subnet6\": [ ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 1
 "{\n"
@@ -1824,7 +1828,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -1857,7 +1864,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:1::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 2
 "{\n"
@@ -1899,7 +1907,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -1998,7 +2009,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:4::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 3
 "{\n"
@@ -2040,7 +2052,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -2139,7 +2154,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:4::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 4
 "{\n"
@@ -2181,7 +2197,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -2280,7 +2299,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:4::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 5
 "{\n"
@@ -2322,7 +2342,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -2355,7 +2378,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:1::/64\",\n"
 "                \"valid-lifetime\": 4\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 6
 "{\n"
@@ -2397,7 +2421,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -2431,7 +2458,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:1::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 7
 "{\n"
@@ -2473,7 +2501,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -2507,7 +2538,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:1::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 8
 "{\n"
@@ -2549,7 +2581,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -2612,7 +2647,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:2::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 9
 "{\n"
@@ -2654,7 +2690,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -2687,7 +2726,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:1::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 10
 "{\n"
@@ -2729,7 +2769,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -2806,7 +2849,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -2885,7 +2931,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -2979,7 +3028,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -3392,7 +3444,10 @@ const char* UNPARSED_CONFIGS[] = {
 "            }\n"
 "        ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -3425,7 +3480,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:1::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 20
 "{\n"
@@ -3467,7 +3523,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -3517,7 +3576,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:1::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 21
 "{\n"
@@ -3586,7 +3646,10 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"type\": \"uint32\"\n"
 "            }\n"
 "        ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -3619,7 +3682,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:1::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 22
 "{\n"
@@ -3697,7 +3761,10 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"type\": \"ipv4-address\"\n"
 "            }\n"
 "        ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -3707,7 +3774,8 @@ const char* UNPARSED_CONFIGS[] = {
 "            \"type\": \"LLT\"\n"
 "        },\n"
 "        \"shared-networks\": [ ],\n"
-"        \"subnet6\": [ ]\n"
+"        \"subnet6\": [ ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 23
 "{\n"
@@ -3802,7 +3870,10 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"type\": \"ipv4-address\"\n"
 "            }\n"
 "        ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -3835,7 +3906,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:1::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 24
 "{\n"
@@ -3877,7 +3949,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -3950,7 +4025,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:2::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 25
 "{\n"
@@ -3992,7 +4068,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -4078,7 +4157,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:1::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 26
 "{\n"
@@ -4135,7 +4215,10 @@ const char* UNPARSED_CONFIGS[] = {
 "            }\n"
 "        ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -4168,7 +4251,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:1::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 27
 "{\n"
@@ -4229,7 +4313,10 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"type\": \"string\"\n"
 "            }\n"
 "        ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -4262,7 +4349,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:1::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 28
 "{\n"
@@ -4304,7 +4392,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -4314,7 +4405,8 @@ const char* UNPARSED_CONFIGS[] = {
 "            \"type\": \"LLT\"\n"
 "        },\n"
 "        \"shared-networks\": [ ],\n"
-"        \"subnet6\": [ ]\n"
+"        \"subnet6\": [ ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 29
 "{\n"
@@ -4356,7 +4448,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -4366,7 +4461,8 @@ const char* UNPARSED_CONFIGS[] = {
 "            \"type\": \"LLT\"\n"
 "        },\n"
 "        \"shared-networks\": [ ],\n"
-"        \"subnet6\": [ ]\n"
+"        \"subnet6\": [ ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 30
 "{\n"
@@ -4408,7 +4504,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -4441,7 +4540,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:1::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 31
 "{\n"
@@ -4483,7 +4583,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -4508,7 +4611,7 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"rapid-commit\": false,\n"
 "                \"rebind-timer\": 2000,\n"
 "                \"relay\": {\n"
-"                    \"ip-addresses\": [ \"2001:db8:1::abcd\", \"2001:db8:1::abce\" ]\n"
+"                    \"ip-addresses\": [ \"2001:db9::abcd\", \"2001:db9::abce\" ]\n"
 "                },\n"
 "                \"renew-timer\": 1000,\n"
 "                \"reservation-mode\": \"all\",\n"
@@ -4516,7 +4619,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:1::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 32
 "{\n"
@@ -4558,7 +4662,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -4660,7 +4767,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:4::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 33
 "{\n"
@@ -4702,7 +4810,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -4750,7 +4861,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8::/40\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 34
 "{\n"
@@ -4792,7 +4904,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -4848,7 +4963,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 35
 "{\n"
@@ -4890,7 +5006,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -4923,7 +5042,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:1::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 36
 "{\n"
@@ -4965,7 +5085,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -5117,7 +5240,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:3::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 37
 "{\n"
@@ -5169,7 +5293,10 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"type\": \"uint32\"\n"
 "            }\n"
 "        ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -5215,7 +5342,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:2::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 38
 "{\n"
@@ -5257,7 +5385,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"client-link-addr-option\", \"remote-id\", \"subscriber-id\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -5267,7 +5398,8 @@ const char* UNPARSED_CONFIGS[] = {
 "            \"type\": \"LLT\"\n"
 "        },\n"
 "        \"shared-networks\": [ ],\n"
-"        \"subnet6\": [ ]\n"
+"        \"subnet6\": [ ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 39
 "{\n"
@@ -5309,7 +5441,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"client-link-addr-option\", \"remote-id\", \"subscriber-id\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -5319,7 +5454,8 @@ const char* UNPARSED_CONFIGS[] = {
 "            \"type\": \"LLT\"\n"
 "        },\n"
 "        \"shared-networks\": [ ],\n"
-"        \"subnet6\": [ ]\n"
+"        \"subnet6\": [ ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 40
 "{\n"
@@ -5361,7 +5497,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -5460,7 +5599,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:4::/48\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 41
 "{\n"
@@ -5502,7 +5642,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"23\", \"37\", \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -5512,7 +5655,8 @@ const char* UNPARSED_CONFIGS[] = {
 "            \"type\": \"LLT\"\n"
 "        },\n"
 "        \"shared-networks\": [ ],\n"
-"        \"subnet6\": [ ]\n"
+"        \"subnet6\": [ ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 42
 "{\n"
@@ -5776,7 +5920,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -5809,7 +5956,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8:1::/64\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 47
 "{\n"
@@ -5851,7 +5999,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -5884,7 +6035,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8::/32\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 48
 "{\n"
@@ -5926,7 +6078,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -5960,7 +6115,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8::/32\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 49
 "{\n"
@@ -6002,7 +6158,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -6041,7 +6200,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8::/32\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 50
 "{\n"
@@ -6083,7 +6243,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -6122,7 +6285,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8::/32\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 51
 "{\n"
@@ -6164,7 +6328,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -6199,7 +6366,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8::/32\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 52
 "{\n"
@@ -6241,7 +6409,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -6277,7 +6448,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8::/32\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 53
 "{\n"
@@ -6319,7 +6491,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -6360,7 +6535,8 @@ const char* UNPARSED_CONFIGS[] = {
 "                \"subnet\": \"2001:db8::/32\",\n"
 "                \"valid-lifetime\": 4000\n"
 "            }\n"
-"        ]\n"
+"        ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 54
 "{\n"
@@ -6416,7 +6592,10 @@ const char* UNPARSED_CONFIGS[] = {
 "        \"mac-sources\": [ \"any\" ],\n"
 "        \"option-data\": [ ],\n"
 "        \"option-def\": [ ],\n"
+"        \"preferred-lifetime\": 3000,\n"
+"        \"rebind-timer\": 2000,\n"
 "        \"relay-supplied-options\": [ \"65\" ],\n"
+"        \"renew-timer\": 1000,\n"
 "        \"server-id\": {\n"
 "            \"enterprise-id\": 0,\n"
 "            \"htype\": 0,\n"
@@ -6426,7 +6605,8 @@ const char* UNPARSED_CONFIGS[] = {
 "            \"type\": \"LLT\"\n"
 "        },\n"
 "        \"shared-networks\": [ ],\n"
-"        \"subnet6\": [ ]\n"
+"        \"subnet6\": [ ],\n"
+"        \"valid-lifetime\": 4000\n"
 "    }\n",
     // CONFIGURATION 55
 "{\n"
diff --git a/src/lib/dhcpsrv/srv_config.cc b/src/lib/dhcpsrv/srv_config.cc
index 3e29985b3f..c2e53b073c 100644
--- a/src/lib/dhcpsrv/srv_config.cc
+++ b/src/lib/dhcpsrv/srv_config.cc
@@ -34,7 +34,8 @@ SrvConfig::SrvConfig()
       cfg_host_operations6_(CfgHostOperations::createConfig6()),
       class_dictionary_(new ClientClassDictionary()),
       decline_timer_(0), echo_v4_client_id_(true), dhcp4o6_port_(0),
-      d2_client_config_(new D2ClientConfig()) {
+      d2_client_config_(new D2ClientConfig()),
+      configured_globals_(Element::createMap()) {
 }
 
 SrvConfig::SrvConfig(const uint32_t sequence)
@@ -50,7 +51,8 @@ SrvConfig::SrvConfig(const uint32_t sequence)
       cfg_host_operations6_(CfgHostOperations::createConfig6()),
       class_dictionary_(new ClientClassDictionary()),
       decline_timer_(0), echo_v4_client_id_(true), dhcp4o6_port_(0),
-      d2_client_config_(new D2ClientConfig()) {
+      d2_client_config_(new D2ClientConfig()),
+      configured_globals_(Element::createMap()) {
 }
 
 std::string
@@ -206,6 +208,21 @@ SrvConfig::updateStatistics() {
     }
 }
 
+void 
+SrvConfig::extractConfiguredGlobals(isc::data::ConstElementPtr config) {
+    if (config->getType() != Element::map) {
+        isc_throw(BadValue, "extractConfiguredGlobals must be given a map element");
+    }
+
+    const std::map<std::string, ConstElementPtr>& values = config->mapValue();
+    for (auto value = values.begin(); value != values.end(); ++value) {
+        if (value->second->getType() != Element::list &&
+            value->second->getType() != Element::map) {
+                addConfiguredGlobal(value->first, value->second);
+        }
+    }
+}
+
 ElementPtr
 SrvConfig::toElement() const {
     // Get family for the configuration manager
@@ -214,8 +231,13 @@ SrvConfig::toElement() const {
     ElementPtr result = Element::createMap();
     // DhcpX global map
     ElementPtr dhcp = Element::createMap();
+
+    // Add in explicitly configured globals.
+    dhcp->setValue(configured_globals_->mapValue()); 
+
     // Set user-context
     contextToElement(dhcp);
+
     // Set decline-probation-period
     dhcp->set("decline-probation-period",
               Element::create(static_cast<long long>(decline_timer_)));
@@ -226,6 +248,7 @@ SrvConfig::toElement() const {
     // Set dhcp4o6-port
     dhcp->set("dhcp4o6-port",
               Element::create(static_cast<int>(dhcp4o6_port_)));
+
     // Set dhcp-ddns
     dhcp->set("dhcp-ddns", d2_client_config_->toElement());
     // Set interfaces-config
diff --git a/src/lib/dhcpsrv/srv_config.h b/src/lib/dhcpsrv/srv_config.h
index 5ca75aefbc..5a73148c12 100644
--- a/src/lib/dhcpsrv/srv_config.h
+++ b/src/lib/dhcpsrv/srv_config.h
@@ -59,10 +59,12 @@ public:
     static const uint32_t CFGSEL_DDNS    = 0x00000010;
     /// Number of all subnets
     static const uint32_t CFGSEL_SUBNET  = 0x00000003;
+    /// Configured globals
+    static const uint32_t CFGSEL_GLOBALS = 0x00000020;
     /// IPv4 related config
-    static const uint32_t CFGSEL_ALL4    = 0x00000015;
+    static const uint32_t CFGSEL_ALL4    = 0x00000035;
     /// IPv6 related config
-    static const uint32_t CFGSEL_ALL6    = 0x0000001A;
+    static const uint32_t CFGSEL_ALL6    = 0x0000003A;
     /// Whole config
     static const uint32_t CFGSEL_ALL     = 0xFFFFFFFF;
     //@}
@@ -556,6 +558,21 @@ public:
         d2_client_config_ = d2_client_config;
     }
 
+    /// @brief Returns pointer to configured global parameters
+    isc::data::ConstElementPtr getConfiguredGlobals() const {
+        return (isc::data::ConstElementPtr(configured_globals_));
+    }
+
+    /// @brief Saves scalar elements from the global scope of a configuration
+    void extractConfiguredGlobals(isc::data::ConstElementPtr config);
+
+    /// @brief Adds a parameter to the collection configured globals
+    /// @param name std::string name of the global to add
+    /// @param value ElementPtr containing the value of the global
+    void addConfiguredGlobal(const std::string& name, isc::data::ConstElementPtr value) {
+        configured_globals_->set(name, value);
+    }
+
     /// @brief Unparse a configuration object
     ///
     /// @return a pointer to unparsed configuration
@@ -657,7 +674,11 @@ private:
     /// this socket is bound and connected to this port and port + 1
     uint16_t dhcp4o6_port_;
 
+    /// @brief Stores D2 client configuration
     D2ClientConfigPtr d2_client_config_;
+
+    /// @brief Stores the global parameters specified via configuration
+    isc::data::ElementPtr configured_globals_;
 };
 
 /// @name Pointers to the @c SrvConfig object.
diff --git a/src/lib/dhcpsrv/tests/srv_config_unittest.cc b/src/lib/dhcpsrv/tests/srv_config_unittest.cc
index 7f5a176fc5..86f3266515 100644
--- a/src/lib/dhcpsrv/tests/srv_config_unittest.cc
+++ b/src/lib/dhcpsrv/tests/srv_config_unittest.cc
@@ -431,6 +431,61 @@ TEST_F(SrvConfigTest, hooksLibraries) {
     EXPECT_TRUE(copied.getHooksConfig().equal(conf.getHooksConfig()));
 }
 
+// Verifies basic functions of configured global handling.
+TEST_F(SrvConfigTest, configuredGlobals) {
+    // Create an instance.
+    SrvConfig conf(32);
+
+    // The map of configured globals should be empty.
+    ConstElementPtr srv_globals = conf.getConfiguredGlobals();
+    ASSERT_TRUE(srv_globals);
+    ASSERT_EQ(Element::map, srv_globals->getType());
+    ASSERT_TRUE(srv_globals->mapValue().empty());
+
+    // Attempting to extract globals from a non-map should throw.
+    ASSERT_THROW(conf.extractConfiguredGlobals(Element::create(777)), isc::BadValue);
+
+    // Now let's create a configuration from which to extract global scalars.
+    // Extraction (currently) has no business logic, so the elements we use
+    // can be arbitrary.
+    ConstElementPtr global_cfg;
+    std::string global_cfg_str =
+    "{\n"
+    " \"astring\": \"okay\",\n"
+    " \"amap\": { \"not-this\":777, \"not-that\": \"poo\" },\n"
+    " \"anint\": 444,\n"
+    " \"alist\": [ 1, 2, 3 ],\n"
+    " \"abool\": true\n"
+    "}\n";
+    ASSERT_NO_THROW(global_cfg = Element::fromJSON(global_cfg_str));
+
+    // Extract globals from the config.
+    ASSERT_NO_THROW(conf.extractConfiguredGlobals(global_cfg));
+
+    // Now see if the extract was correct.
+    srv_globals = conf.getConfiguredGlobals();
+    ASSERT_TRUE(srv_globals);
+    ASSERT_EQ(Element::map, srv_globals->getType());
+    ASSERT_FALSE(srv_globals->mapValue().empty());
+
+    // Maps and lists should be excluded.
+    auto globals = srv_globals->mapValue();
+    for (auto global = globals.begin(); global != globals.end(); ++global) {
+        if (global->first == "astring") {
+            ASSERT_EQ(Element::string, global->second->getType());
+            EXPECT_EQ("okay", global->second->stringValue());
+        } else if (global->first == "anint") {
+            ASSERT_EQ(Element::integer, global->second->getType());
+            EXPECT_EQ(444, global->second->intValue());
+        } else if (global->first == "abool") {
+            ASSERT_EQ(Element::boolean, global->second->getType());
+            EXPECT_TRUE(global->second->boolValue());
+        } else {
+            ADD_FAILURE() << "unexpected element found:" << global->first;
+        }
+    }
+}
+
 // Verifies that the toElement method works well (tests limited to
 // direct parameters)
 TEST_F(SrvConfigTest, unparse) {
@@ -448,8 +503,7 @@ TEST_F(SrvConfigTest, unparse) {
     defaults += conf.getCfgExpiration()->toElement()->str() + ",\n";
     defaults += "\"lease-database\": { \"type\": \"memfile\" },\n";
     defaults += "\"hooks-libraries\": [ ],\n";
-    defaults += "\"dhcp-ddns\": \n";
-    defaults += conf.getD2ClientConfig()->toElement()->str() + ",\n";
+    defaults += "\"dhcp-ddns\": \n"; defaults += conf.getD2ClientConfig()->toElement()->str() + ",\n";
 
     std::string defaults4 = "\"echo-client-id\": true,\n";
     defaults4 += "\"shared-networks\": [ ],\n";
@@ -481,15 +535,28 @@ TEST_F(SrvConfigTest, unparse) {
     isc::test::runToElementTest<SrvConfig>
         (header6 + defaults + defaults6 + trailer, conf);
 
-    // Verify direct non-default parameters
+    // Verify direct non-default parameters and configured globals
     CfgMgr::instance().setFamily(AF_INET);
     conf.setEchoClientId(false);
     conf.setDhcp4o6Port(6767);
+    // Add "configured globals"
+    conf.addConfiguredGlobal("renew-timer", Element::create(777));
+    conf.addConfiguredGlobal("foo", Element::create("bar"));
     params = "\"echo-client-id\": false,\n";
-    params += "\"dhcp4o6-port\": 6767\n";
+    params += "\"dhcp4o6-port\": 6767,\n";
+    params += "\"renew-timer\": 777,\n";
+    params += "\"foo\": \"bar\"\n";
     isc::test::runToElementTest<SrvConfig>
         (header4 + defaults + defaults4 + params + trailer, conf);
-}    
+
+    // Verify direct non-default parameters and configured globals
+    CfgMgr::instance().setFamily(AF_INET6);
+    params = ",\"dhcp4o6-port\": 6767,\n";
+    params += "\"renew-timer\": 777,\n";
+    params += "\"foo\": \"bar\"\n";
+    isc::test::runToElementTest<SrvConfig>
+        (header6 + defaults + defaults6 + params + trailer, conf);
+}
 
 // Verifies that the toElement method does not miss host reservations
 TEST_F(SrvConfigTest, unparseHR) {