diff options
| author | Andrei Pavel <andrei@isc.org> | 2022-04-04 15:34:14 +0200 |
|---|---|---|
| committer | Tomek Mrugalski <tomek@isc.org> | 2022-04-25 15:00:37 +0200 |
| commit | 4a035f60cf2bd4dab3a4b05effb4f28d42b258c9 (patch) | |
| tree | 2698f372a547cb0ba5bf34aaf1934da2d81d12f1 /doc/sphinx/arm/dhcp4-srv.rst | |
| parent | Update conf.py (diff) | |
| download | kea-4a035f60cf2bd4dab3a4b05effb4f28d42b258c9.tar.xz kea-4a035f60cf2bd4dab3a4b05effb4f28d42b258c9.zip | |
[#1842] document overlapping pools and subnets
Diffstat (limited to 'doc/sphinx/arm/dhcp4-srv.rst')
| -rw-r--r-- | doc/sphinx/arm/dhcp4-srv.rst | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/doc/sphinx/arm/dhcp4-srv.rst b/doc/sphinx/arm/dhcp4-srv.rst index 9feabe94a7..be5f90ed62 100644 --- a/doc/sphinx/arm/dhcp4-srv.rst +++ b/doc/sphinx/arm/dhcp4-srv.rst @@ -1231,6 +1231,26 @@ address) address from that pool. In the aforementioned example of pool assigned as well. This may be invalid in some network configurations. To avoid this, use the ``min-max`` notation. +.. note:: + + Here are some liberties and limits to the values that subnets and pools can + take in Kea configurations that are out of the ordinary: + + +-------------------------------------------------------------+---------------+--------------------------------------------------------------------------------+ + | Kea configuration case | Result | Comment | + +=============================================================+===============+================================================================================+ + | Overlapping subnets | Allowed | Administrator consideration needs to be given to how clients are matched to | + | | | these subnets. | + +-------------------------------------------------------------+---------------+--------------------------------------------------------------------------------+ + | Overlapping pools in one subnet | Startup error | DHCP4_PARSER_FAIL | + +-------------------------------------------------------------+---------------+--------------------------------------------------------------------------------+ + | Overlapping address pools in different subnets | Allowed | Can act as a substitute for a global pool mechanic. When assigning leases from | + | | | one pool, Kea correctly excludes leases given under any pool that overlaps | + | | | with it such that no lease is given twice. | + +-------------------------------------------------------------+---------------+--------------------------------------------------------------------------------+ + | Pools that are outside the subnet they are configured under | Startup error | DHCP4_PARSER_FAIL | + +-------------------------------------------------------------+---------------+--------------------------------------------------------------------------------+ + .. _dhcp4-t1-t2-times: Sending T1 (Option 58) and T2 (Option 59) |