IGMP problems.

[hav0c]

Well I have smoothwall running on a computer acting as a router for my ISDN connection. I have it set up to dial on demand and I have it set to auto disconnect after 5 min. of inactivity. Thing is it won't disconnect because about every 60 seconds I get stupid IGMP mulitcast junk causing the timer for pppd to reset. I have set iptables to drop the packets... but it doesn't help because it still has to receive the packet to know if it should drop it or not. So what can I do? Anyway to get pppd to ignore the IGMP packets?

Any suggestions?

[desmocat]

Are you getting the IGMP traffic across the same interface as the DDR/isdn interface?
I don't know about smoothwall, but if you could have the two interfaces separate, you could filter the IGMP traffic with an inbound access list to deny anything that is from 224.X.X.X and the ISDN interface would never see any of the updates.
Hope this stirs up something to maybe help you.