linux/Documentation/networking/ip_dynaddr.txt
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   1IP dynamic address hack-port v0.03
   2~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   3This stuff allows diald ONESHOT connections to get established by
   4dynamically changing packet source address (and socket's if local procs).
   5It is implemented for TCP diald-box connections(1) and IP_MASQuerading(2).
   6
   7If 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
  14This is specially helpful for auto dialup links (diald), where the
  15``actual'' outgoing address is unknown at the moment the link is
  16going up. So, the *same* (local AND masqueraded) connections requests that
  17bring 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
  27Enjoy!
  28
  29-- Juanjo  <jjciarla@raiz.uncu.edu.ar>
  30
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