On Sat, 09 Mar 2013 16:53:27 +0100 (CET) Alexandre DERUMIER <aderum...@odiso.com> wrote:
> >>Are you sure about that? How can we test that (looking at the sources it > >>seems to be enabled)? > > igmp querier in linux bridge is on disabled in newer kernel since the commit > I have pointed, > but it's enabled by default is current redhat kernel. > > With tcpdump on bridge you should see igmp queries comming from the bridge. > This is from the bridge carrying proxmox cluster traffic: tcpdump -i vmbr30 -vv net 224.0.0.0/4 |grep 'igmp query' tcpdump: listening on vmbr30, link-type EN10MB (Ethernet), capture size 65535 bytes 0.0.0.0 > all-systems.mcast.net: igmp query v2 From a bridge where no multicast traffic should occur: tcpdump -i vmbr20 -vv net 224.0.0.0/4 tcpdump: listening on vmbr20, link-type EN10MB (Ethernet), capture size 65535 bytes 17:20:45.093219 IP (tos 0xc0, ttl 1, id 0, offset 0, flags [DF], proto IGMP (2), length 32, options (RA)) 0.0.0.0 > all-systems.mcast.net: igmp query v2 As Alexandre stated multicast query is happening. But apparently my switch ignores querying or the query sent from the bridge is not a request to be querier since if I disable querying on the switch no multicast traffic is passed through the switch. A side note: igmp multicast traffic is also used for building routing tables so disable it might have severe impact on network performance. -- Hilsen/Regards Michael Rasmussen Get my public GnuPG keys: michael <at> rasmussen <dot> cc http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xD3C9A00E mir <at> datanom <dot> net http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xE501F51C mir <at> miras <dot> org http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xE3E80917 -------------------------------------------------------------- Never have so many understood so little about so much. -- James Burke
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