On 2013-03-31 Robert Keizer wrote:
Keep in mind that turning off rp filter means that packets which match an IP for any interface will be accepted on all.
Is that what it does? I just remember multihome just would not work at all until I set rp to 0.
Also, I've found in my tests that the packets always come back to the correct modem. I've never seen any randomness; packets coming back into the wrong modem.
I have no idea how iptables/netfilter and/or the kernel even would react to such packets if they did exist.
Either way, if it's not a security issue and if it all works as-is, I'm not too concerned :-)