On Wed, Jul 25, 2012 at 12:07:25PM +0200, Henning Brauer wrote: > * Lee Verberne <l...@blarg.org> [2012-07-19 23:46]: > > A power supply failed in my 2-node OpenBSD 5.1 unicast CARP cluster > > recently. After the failure I noticed that the carp demote counter was > > being increased by output errors: > > > > carp: carp0 demoted group carp by 1 to 1 (> snderrors) > > > > I tracked this back to the surviving node being unable to arp for the > > ethernet address of its carppeer. At least, adding static permanent arp > > entries stopped the Oerrs on carp0. > > > > I'm planning on adding static arp entries as a best-practice now any > > time I use unicast CARP. I didn't see any documentation or list traffic > > on this topic, though, so I thought I'd ask what others do. Am I > > missing something or is this ill-advised? > > hmm, interesting one. I guess the best thing we could do, is to ignore send errors if unicast carp is being used. I don't think we can distinguish the ip_output errors to only ignore failures on missing arp entries.
> not too ill-advised (the common problem with static arp entries > remain, foremost, they are static, thus changes require extra steps). > > -- > Henning Brauer, h...@bsws.de, henn...@openbsd.org > BS Web Services, http://bsws.de, Full-Service ISP > Secure Hosting, Mail and DNS Services. Dedicated Servers, Root to Fully > Managed > Henning Brauer Consulting, http://henningbrauer.com/
