carp0 interface goes down on 6.2-PRERELEASE

[Tom Judge]

Ari Suutari wrote:
> Hi,
>
> I started experimenting with carp, in order to replace
> freevrrpd stuff we are currently using.
>
> I'm running quite recent version of RELENG_6 (compiled
> this week).
>
> I was able to configure carp ok, but for some odd reason the
> interface goes down by itself shortly after it has been configured.
>
> Here is output from test script:
>
> # sh -x test.sh
> + ifconfig carp0 destroy
> + ifconfig carp0 create
> + ifconfig carp0 up
> + ifconfig carp0 inet 192.168.5.59/24 vhid 55 pass xxx123
> + ifconfig carp0
> carp0: flags=49<UP,LOOPBACK,RUNNING> mtu 1500
>         inet 192.168.5.59 netmask 0xffffff00
>         carp: BACKUP vhid 55 advbase 1 advskew 0
> + sleep 5
> + ifconfig carp0
> carp0: flags=8<LOOPBACK> mtu 1500
>         carp: INIT vhid 55 advbase 1 advskew 0
>
> See, here the interface is up, but after 5 seconds it has gone
> down. Could anybody give a hint why this happens ? There are
> messages on console about promiscuous mode being enabled/disabled,
> but nothing else.
>

I have seen similar problems when the carp multicast (224.0.0.18) 
traffic was not allowed to be transmitted to the network due to a 
firewall configuration problem.

Tom