| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |