On 7/31/11 4:02 PM, Jussi Peltola wrote: > On Sun, Jul 31, 2011 at 02:16:15PM -0700, David Newman wrote: >> 2. CARP heartbeat messages use multicast. This means a switch with >> dual-stack CARP-attached devices should support not only IGMP snooping >> for IPv4 but also MLD snooping for IPv6. > > Hmm. carppeer does not seem to like an inet6 address to work around > that. I wonder what happens if you dual-stack a carp interface with a > carppeer - I remember having some mysterious issues after which I've > been running a separate carp if for ipv6. OTOH I have dual-stacked > carppeer-less carp if's that show no problems. Perhaps I can find time > to investigate.
Can't say; I've never used carppeer. If it's used with a multicast group address I would think the switch would need to support MLD for this to work with IPv6. The only exception I can think of is with a crummy switch that just floods multicast frames everywhere, same as broadcast. dn
