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...got a problem similar to this one (http://mailman.ds9a.nl/pipermail/lartc/2005q4/017614.html), GRE tunnel can forward normal IP packets such as ICMP but failed to tunnel multicast traffics. Here''s the setup: 192.168.20.0/24 LAN-A--------------RtrA-------------RtrB--------------LAN-B 192.168.50.0/24 192.168.60.0/24 RtrA interfaces: eth0 192.168.20.100 eth1 192.168.50.1 HOSTA in LAN-A eth0 192.168.50.250 RtrB interfaces: eth0 192.168.20.98 eth1 192.168.60.1 HOSTB in LAN-B eth0 192.168.60.250 Here is the setup script on RtrB:...

I need to send multicast traffic through a GRE tunnel between two Linux routers. The tunnel works for normal IP packets, but I can''t see how to make it work for multicast. Here''s the setup: 10.10.10.0/24 LAN-B--------------RtrB-------------RtrC--------------LAN-C 192.168.2.0/24 192.168.1.0/24 RtrB interfaces: eth0 192.168.2.1 eth1 10.10.10.11 RtrC interfaces: eth0 192.168.1.1 eth1 10.10.10.201 Tunnel setup on RtrB: ip tunnel add netC mode gre remote 10.10.10.201 local 10.10....