ip_dynaddr.txt
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> |