Re: Problem filtering CARP in PF

[Marco Pfatschbacher]

On Fri, Mar 02, 2012 at 09:23:38AM +0100, Marios Makassikis wrote:
> 
> The demotion counter is decremented when you lose connectivity (ip_output
> errors for instance), but shouldn't it be reincremented when you regain
> connectivity?
 
Well, that's a chicken and egg problem there.
It won't send out any further advertisements, because its demote
count is higher. But without doing so, it cannot know that the error
is gone.
We could try to solve this by sending some probe carp advertisements
using an unused/reserved vhid, but I'm not sure if that's worth the
trouble..