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I am running an arch box as a router. I have gotten it working quite well, doesn't almost everything I need. One issue that I am still having problems with is upnp port forwarding from a different subnet.
My gateway(the arch router) is 192.168.5.1
it is running the upnp service (linux-igd) and works fine reciving requests and forwarding port for anyone on 192.168.5.0/24
I however have a second subnet at 192.168.2.0/28 and upnp programs on it do not successfully forward ports. I made sure I do not have filter multicast enabled on the 2nd router. I am not double nating either so I am not sure whats wrong.
I made sure to add the multicast routes to my router as well ( i can't add them to the 2nd router but I don't think thats the issue)
239.0.0.0 * 255.0.0.0 U 0 0 0 lan
224.0.0.0 * 240.0.0.0 U 0 0 0 lan
I googled the upnp standard at it says ttl of 4 so I should be fine going only 1 subnet away.
One thing that I was attempted but couldn't figure out how to correctly set it was using iptables to increase the ttl on any multicast coming out of the arch box.
If anyone can point out or explain what I am doing wrong I would be really thankful.
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