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Documentation / networking / ip_dynaddr.txt




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Based on kernel version 3.9. Page generated on 2013-05-02 23:11 EST.

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