question regarding mrouted error

Hi, I was wondering if anyone could help me with the following warning in mrouted: --- warning - received IP data field too short(8 bytes) for IGMP --- I checked the value of IGMP_MINLEN field in igmp.

urgent question regarding IP-in-IP encapsulation

Hi, I have a question regarding Ip-in-IP encapsulation in freeBSD. In my implementation, I want a multicast router to encapsulate multicast packets destined for certain groups with an extra IP header before forwarding them out. I am giving below some of the code: if(IN_MULTICAST(ntohl(ip->ip_dst