Thank you Mike, that seems to be my problem!
I am using an SMC-8728 switch, and IGMPv2 is simply not making it
through tagged VLANs on the switch. But when I test on my HP-2810 things
are fine!
Just sent out a report to SMC support; let's see what they come up with.
Thank again for pointing me into the right direction,
Z.
Mike wrote:
Zoilo Gomez wrote:
Using tcpdump, I see that the IGMPv2 queries being sent out on the
server via the vlan101 interface, however nothing ever arrives on the
client. ICMP (ping) and other traffic over the VLAN are working fine.
Does anybody have a clue what could be the problem?
I don't know if this is your problem, but Cisco IOS has a bug in
earlier revs that incorrectly counts vlan tagged frams that are 64
octets, as 'runts' (but, forwards them anyways) - I beleive it's
expecting a 68 octet minimum in the vlan tagged case. But the second
part is that with this bug, although frames are being forwarded,
multicast is not, which will lead to the case where ping and such
works but igmp for example does not. This will also break carp and
other multicast reliant protocols as well. This bug exists in 2003 -
2004 year release verisons of IOS and I don't know if it was ever
documented by cisco but it's for real and is resolved in later revs.
One clue if your switch supports this, is flashing amber on the
switchport(s) of your 8021q enabled router and excessive runt frames
noted in the interface statistics of the switch.
Does anyone have multicast+igmp running over Linux vlans?
Yes, lots and lots, but the above fix was necessary when we
upgraded to 2970 switches....
Mike-
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