1 IP dynamic address hack-port v0.03
2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3 This stuff allows diald ONESHOT connections to get established by
4 dynamically changing packet source address (and socket's if local procs).
5 It is implemented for TCP diald-box connections(1) and IP_MASQuerading(2).
6
7 If enabled[*] and forwarding interface has changed:
8 1) Socket (and packet) source address is rewritten ON RETRANSMISSIONS
9 while in SYN_SENT state (diald-box processes).
10 2) Out-bounded MASQueraded source address changes ON OUTPUT (when
11 internal host does retransmission) until a packet from outside is
12 received by the tunnel.
13
14 This is specially helpful for auto dialup links (diald), where the
15 ``actual'' outgoing address is unknown at the moment the link is
16 going up. So, the *same* (local AND masqueraded) connections requests that
17 bring the link up will be able to get established.
18
19 [*] At boot, by default no address rewriting is attempted.
20 To enable:
21 # echo 1 > /proc/sys/net/ipv4/ip_dynaddr
22 To enable verbose mode:
23 # echo 2 > /proc/sys/net/ipv4/ip_dynaddr
24 To disable (default)
25 # echo 0 > /proc/sys/net/ipv4/ip_dynaddr
26
27 Enjoy!
28
29 -- Juanjo <jjciarla@raiz.uncu.edu.ar>
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