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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /Documentation/networking/ip_dynaddr.txt
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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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>