Re: DNAT, and finding out original destination IP?

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On Friday 2008-04-25 13:06, Bradley Kite wrote:
>
>I'm using DNAT to transparently redirect TCP connections to a local
>application which is listening on a port for new connections.
>
>From within my application, I'd like to be able to find out the
>original destination IP address of the packet/connection, before it
>got DNAT'ed.

getsockopt(... SO_ORIGINAL_DST ...) in endpoint programs or
alternatively, iptables -m conntrack --ctorigdst <xxx> can be used
in iptables.
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