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Date: Fri, 8 Mar 2013 18:51:32 +0100 From: Michael Rasmussen <m...@datanom.net> To: Alexandre DERUMIER <aderum...@odiso.com> Subject: Re: [pve-devel] corosync, multicast problem because of vmbr multicast_snooping enabled On Fri, 08 Mar 2013 18:26:59 +0100 (CET) Alexandre DERUMIER <aderum...@odiso.com> wrote: > > >>You are certain that it is not your switch which is causing problems? > Do you talk to me or Dietmar ? > To you:-) > >>I have never seen multicast problems in my log files and my switch will > >>block multicast traffic unless multicast snooping is enabled on the > >>ports involved or the entire vlan. > This is strange, with multicast snooping (on your switch), your switch should > forward multicast traffic to all ports, > and not block it. By switch by default blocks all multicast traffic. This can be open on selected ports or an entire vlan. > What is your switch model ? > HP V1910 > > > What I don't known is the relationship between igmp snooping of linux bridge > and igmp snooping of a physical switchs. > Logical deduction: A linux bridge is like an unmanage switch using un-tagged packages so provided the physical nic or bond on witch the bridge is configured allows multicast traffic then the linux switch will also carry multicast traffic unless blocked in the kernel or by iptables. The Phd thesis describing the igmp snooping implementation in linux bridges can be downloaded here: http://eprints.fri.uni-lj.si/1086/ -- 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 -------------------------------------------------------------- Send a self-addressed, stamped envelope. -- 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 -------------------------------------------------------------- Life is like an onion: you peel off layer after layer and then you find there is nothing in it. -- James Huneker
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