summaryrefslogtreecommitdiffstats
path: root/Documentation/networking/ip_dynaddr.txt
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/networking/ip_dynaddr.txt')
-rw-r--r--Documentation/networking/ip_dynaddr.txt29
1 files changed, 29 insertions, 0 deletions
diff --git a/Documentation/networking/ip_dynaddr.txt b/Documentation/networking/ip_dynaddr.txt
new file mode 100644
index 000000000000..45f3c1268e86
--- /dev/null
+++ b/Documentation/networking/ip_dynaddr.txt
@@ -0,0 +1,29 @@
+IP dynamic address hack-port v0.03
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+This stuff allows diald ONESHOT connections to get established by
+dynamically changing packet source address (and socket's if local procs).
+It is implemented for TCP diald-box connections(1) and IP_MASQuerading(2).
+
+If enabled[*] and forwarding interface has changed:
+ 1) Socket (and packet) source address is rewritten ON RETRANSMISSIONS
+ while in SYN_SENT state (diald-box processes).
+ 2) Out-bounded MASQueraded source address changes ON OUTPUT (when
+ internal host does retransmission) until a packet from outside is
+ received by the tunnel.
+
+This is specially helpful for auto dialup links (diald), where the
+``actual'' outgoing address is unknown at the moment the link is
+going up. So, the *same* (local AND masqueraded) connections requests that
+bring the link up will be able to get established.
+
+[*] At boot, by default no address rewriting is attempted.
+ To enable:
+ # echo 1 > /proc/sys/net/ipv4/ip_dynaddr
+ To enable verbose mode:
+ # echo 2 > /proc/sys/net/ipv4/ip_dynaddr
+ To disable (default)
+ # echo 0 > /proc/sys/net/ipv4/ip_dynaddr
+
+Enjoy!
+
+-- Juanjo <jjciarla@raiz.uncu.edu.ar>