1.. SPDX-License-Identifier: GPL-2.0 2 3================================== 4IP dynamic address hack-port v0.03 5================================== 6 7This stuff allows diald ONESHOT connections to get established by 8dynamically changing packet source address (and socket's if local procs). 9It is implemented for TCP diald-box connections(1) and IP_MASQuerading(2). 10 11If enabled\ [#]_ and forwarding interface has changed: 12 13 1) Socket (and packet) source address is rewritten ON RETRANSMISSIONS 14 while in SYN_SENT state (diald-box processes). 15 2) Out-bounded MASQueraded source address changes ON OUTPUT (when 16 internal host does retransmission) until a packet from outside is 17 received by the tunnel. 18 19This is specially helpful for auto dialup links (diald), where the 20``actual`` outgoing address is unknown at the moment the link is 21going up. So, the *same* (local AND masqueraded) connections requests that 22bring the link up will be able to get established. 23 24.. [#] At boot, by default no address rewriting is attempted. 25 26 To enable:: 27 28 # echo 1 > /proc/sys/net/ipv4/ip_dynaddr 29 30 To enable verbose mode:: 31 32 # echo 2 > /proc/sys/net/ipv4/ip_dynaddr 33 34 To disable (default):: 35 36 # echo 0 > /proc/sys/net/ipv4/ip_dynaddr 37 38Enjoy! 39 40Juanjo <jjciarla@raiz.uncu.edu.ar> 41