All things related to multicast

[Stig Venaas <>]

Nicholas J Humfrey wrote:
> Yes, I wasn't expecting this behaviour, but it certainly seems to 
> happen. Could this be a known Cisco bug? Does it keep group membership 
> state in a single table or multiple tables for each IGMP version?

At least I haven't seen any such issues with Cisco. Rather than guessing
where the bug might be, try to do some debugging. First thing I would do
is tcpdump/wireshark to see which IGMP messages each of the hosts
receive and send, also check the IGMP state on the router for the
relevant groups, and if possible the IGMP state on the host for that
group. I don't know how much info you can get out of Mac OS X and
Vista...

Stig