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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /Documentation/networking/ip_dynaddr.txt
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+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>