* transparent UDP proxy
@ 2008-03-18 11:59 Michel Lespinasse
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From: Michel Lespinasse @ 2008-03-18 11:59 UTC (permalink / raw)
To: netdev
Hi,
After redirecting UDP connections to a local port with netfilter (DNAT),
I'm trying to figure out what the original intended destination was.
For TCP sockets, I could just use the SO_ORIGINAL_DST socket option,
but that does not work with UDP (I tried, with a 2.6.22.19 kernel)
I also tried using recvmsg and looking for an IP_PKTINFO control message
as outlined in
http://lists.cistron.nl/pipermail/freeradius-users/2002-March/005600.html
but that did not work either (no anciliary data was ever received).
Is there any way to figure out the original destination IP of a NATed
UDP packet ?
Thanks,
--
Michel Lespinasse
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2008-03-18 11:59 transparent UDP proxy Michel Lespinasse
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