ip_dynaddr.txt

ip_dynaddr.txt - v i а SеrgеniuS, 04/30/2011 12:37 pm

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IP dynamic address hack-port v0.03
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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This stuff allows diald ONESHOT connections to get established by
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dynamically changing packet source address (and socket's if local procs).
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It is implemented for TCP diald-box connections(1) and IP_MASQuerading(2).
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If enabled[*] and forwarding interface has changed:
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  1)  Socket (and packet) source address is rewritten ON RETRANSMISSIONS
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      while in SYN_SENT state (diald-box processes).
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  2)  Out-bounded MASQueraded source address changes ON OUTPUT (when
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      internal host does retransmission) until a packet from outside is
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      received by the tunnel.
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This is specially helpful for auto dialup links (diald), where the
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``actual'' outgoing address is unknown at the moment the link is
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going up. So, the *same* (local AND masqueraded) connections requests that
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bring the link up will be able to get established.
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[*] At boot, by default no address rewriting is attempted. 
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  To enable:
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     # echo 1 > /proc/sys/net/ipv4/ip_dynaddr
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  To enable verbose mode:
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     # echo 2 > /proc/sys/net/ipv4/ip_dynaddr
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  To disable (default)
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     # echo 0 > /proc/sys/net/ipv4/ip_dynaddr
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Enjoy!
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-- Juanjo  <jjciarla@raiz.uncu.edu.ar>
Thank you!