Re: kern/47013: carp device misbehaving with ipv6 alias (ip6_output, failed: 65 / HOSTUNREACH)

[Hauke Fath <hf%spg.tu-darmstadt.de@localhost>]

The following reply was made to PR kern/47013; it has been noted by GNATS.

From: Hauke Fath <hf%spg.tu-darmstadt.de@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: Hauke Fath <hf%spg.tu-darmstadt.de@localhost>
Subject: Re: kern/47013: carp device misbehaving with ipv6 alias (ip6_output,
 failed: 65 / HOSTUNREACH)
Date: Tue, 18 Oct 2016 16:33:42 +0200

 I find that, even with this PR's "workaround" patch in place, the 
 secondary host's attempts to take over the one interface that has an 
 ipv6 address go on:
 
 % fgrep carp0 /var/log/messages | wc -l
       299
 % fgrep carp0 /var/log/messages | tail -20
 Oct 18 15:47:19 secondary-router /netbsd: carp0: MASTER -> BACKUP (more 
 frequent advertisement received)
 Oct 18 15:47:19 secondary-router /netbsd: carp0: state transition from: 
 MASTER -> to: BACKUP
 Oct 18 15:47:22 secondary-router /netbsd: carp0: INIT -> MASTER (preempting)
 Oct 18 15:47:22 secondary-router /netbsd: carp0: state transition from: 
 BACKUP -> to: MASTER
 Oct 18 15:47:26 secondary-router /netbsd: carp0: MASTER -> BACKUP (more 
 frequent advertisement received)
 Oct 18 15:47:26 secondary-router /netbsd: carp0: state transition from: 
 MASTER -> to: BACKUP
 Oct 18 15:47:30 secondary-router /netbsd: carp0: INIT -> MASTER (preempting)
 Oct 18 15:47:30 secondary-router /netbsd: carp0: state transition from: 
 BACKUP -> to: MASTER
 Oct 18 16:02:12 secondary-router /netbsd: carp0: MASTER -> BACKUP (more 
 frequent advertisement received)
 Oct 18 16:02:12 secondary-router /netbsd: carp0: state transition from: 
 MASTER -> to: BACKUP
 Oct 18 16:02:15 secondary-router /netbsd: carp0: INIT -> MASTER (preempting)
 Oct 18 16:02:15 secondary-router /netbsd: carp0: state transition from: 
 BACKUP -> to: MASTER
 Oct 18 16:20:28 secondary-router /netbsd: carp0: MASTER -> BACKUP (more 
 frequent advertisement received)
 Oct 18 16:20:28 secondary-router /netbsd: carp0: state transition from: 
 MASTER -> to: BACKUP
 Oct 18 16:20:32 secondary-router /netbsd: carp0: INIT -> MASTER (preempting)
 Oct 18 16:20:32 secondary-router /netbsd: carp0: state transition from: 
 BACKUP -> to: MASTER
 Oct 18 16:24:30 secondary-router /netbsd: carp0: MASTER -> BACKUP (more 
 frequent advertisement received)
 Oct 18 16:24:30 secondary-router /netbsd: carp0: state transition from: 
 MASTER -> to: BACKUP
 Oct 18 16:24:34 secondary-router /netbsd: carp0: INIT -> MASTER (preempting)
 Oct 18 16:24:34 secondary-router /netbsd: carp0: state transition from: 
 BACKUP -> to: MASTER
 %
 
 ... telling me the underlying problem is not fixed. Every now and then, 
 ssh sessions are dying on me.
 
 hauke