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>