| 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> |