Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> |