kern/98622: carp with IPv6 broken on 6.1

[Philippe Pegon]

>Number:         98622
>Category:       kern
>Synopsis:       carp with IPv6 broken on 6.1
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jun 07 15:30:18 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Philippe Pegon
>Release:        6.1
>Organization:
>Environment:
# uname -a
FreeBSD ns1a.u-strasbg.fr 6.1-RELEASE FreeBSD 6.1-RELEASE #1: Wed May 10 12:21:39 CEST 2006     root at crc.u-strasbg.fr:/usr/obj/usr/src/sys/NS1A  i386

>Description:
when an inet6 address is configured on a carp interface, the master works fine, but the backup is constantly switching between master and slave.
It worked fine on FreeBSD 6.0, the problem appeared after upgrading from 6.0 to 6.1
While looking with tcpdump, I can't see IPv6 carp advertisement on FreeBSD 6.1, whereas I can see it with FreeBSD 6.0
>How-To-Repeat:
two box with FreeBSD 6.1 in failover with carp, configure an IPv6 address on the carp interface and you can see the backup switching from master to slave in loop.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: