mikeage
Joined: 11 Sep 2008
Posts: 70
Location: Israel
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| Posted: Sun May 24, 2009 7:37 am Post subject: Replacing rp_filter with iptables |
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I've had to disable rp_filter for an interface (tun0) for an OpenVPN network which uses SNAT and policy based routing (see http://michael.gorven.za.net/blog/2008/08/15/routing-port-number for example). Several sites I found (none of which I can find at the moment, of course), suggested using iptables to mimic the functionality of rp_filter (in my case, I have a packet that was originally sourced from 192.168.1.100 (b/c of the default route) being SNAT'ed to a source of 192.168.2.5 (b/c of the policy route), and rp_filter was rejecting the return packets).
I didn't find any instructions anywhere for how to implement rp_filter (where needed) using iptables -- any advice? |
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