Multicast and ip_route_input()

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I am trying to send igmp traffic from eth1 to eth0.  So in ip_route_input() I check if (MULTICAST(daddr)&&skb->nh.iph->protocol == IPPROTO_IGMP) and the input device is eth1 then I copy it to eth0.  The weird thing is that it only works if I do a tcpdump on eth1.  I have some printk statements and the multicast packets dont get to ip_route_input unless tcpdump is running.  I am not running a multicast router.  If anyone has any ideas I would appreciate the help.  Thanks.

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