My understanding of EIGRP multicast packets was that the TTL is set to one, and that this is the mechanism that prevents the packet from being routed off the local subnet.
However, doing a packet capture reveals that the TTL on EIGRP multicast packets is actually 2. Some research hints that the same may be true for RIP and OSPF, although I haven't verified. The Wireshark expert note refers to RFC 3171, but that RFC doesn't mention TTL. Here is the actual text of the note: "Time To Live" != 1 for a packet sent to the Local Network Control Block (see RFC 3171) So what is the purpose of setting these TTL's to 2? Obviously, they are not getting routed off the subnet, so some other mechanism is being used to prevent this. Thanks, Doug _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs
