Re: Anyone have scripts for managing interfaces under new CARP setup?

On 2013-04-02 1:52 AM, "Gleb Smirnoff" <glebius_at_freebsd.org> wrote:
>
>   Freddie,
>
> On Wed, Mar 27, 2013 at 04:10:03PM -0700, Freddie Cash wrote:
> F> Just curious if anyone has any scripts for managing fail-over of
multiple
> F> interfaces using the new CARP setup in 10-CURRENT.
> F>
> F> Fail-over of all CARP vhids associated with a single interface is
working
> F> correctly.  But, I have 2 separate, physical interfaces running with
CARP,
> F> and want to fail-over everything if one of the links (or boxes) goes
down.
> F>
> F> Figured I'd ask around to see if anyone has done something like this
> F> already.  I've been playing with devd.conf settings and logging
events, but
> F> don't have anything written up to do the actual switch yet.
>
>   Same as for old CARP, you can achieve behavior when a box with lower
> advskew yields master status to a second one, setting:
>
> sysctl net.inet.carp.preempt=1
>
>   If an interface on the master has proper link state notification to the
> kernel, then once the interface goes down, the advskew on the box will be
> demoted and backup box will preempt it.

That's how I have things set and it wasn't switching the 2nd interface.

However, I think that may be due to the IPFW rules on one interface
blocking CARP multicast packets on that interface, while they were going
through correctly on the 2nd interface. I'll see if I can schedule a manual
test later this week now that IPFW is configured correctly.

Thanks for the confirmation of things are supposed to work.