On Fri, Sep 15, 2006 at 12:49:20PM -0700, Tom Bombadil wrote: > Greetings all... This was probably discussed before, but I couldn't > really find anything in the archives. > > 1) We have a carp0 interface with a few aliases in it, and carp works > fine between master (SERVER-A) and backup (SERVER-B)... until... > > 2) ... we plumb a another new alias into SERVER-B's carp0. Then the > status of carp0 on SERVER-B goes from BACKUP to MASTER, even though the > advskew on SERVER-A is lower (0) than SERVER-B's advskew (127).
carp only accepts advertisments if the configuration (hash) is identical. > 3) Now, we have both servers saying carp0 is MASTER, and some > connectivity problems going on, and this in the logs: > Sep 15 04:00:02 fw1 /bsd: carp0: incorrect hash of course. both hosts use the same MAC and IP address. > 4) We haven't tested it, but it seems that if we have added the alias to > SERVER-A first, the problem would still happen, because the hash would > be different as well. > > Question: whats the best way to add an alias to carp, and avoid this > problem? ifconfig down the carp on the backup, add the alias on the backup, add the alias on the master, ifconfig up the backup.
