mirror of
https://github.com/torvalds/linux.git
synced 2024-12-23 11:21:33 +00:00
30 lines
1.2 KiB
Plaintext
30 lines
1.2 KiB
Plaintext
|
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>
|