CARP issue with 2 Masters

[Frank Cam]

Hi Matthew

That did the trick, have accidentally been using an old pre-carp set of 
firewall rules for the last few days. After your response, I went back and 
updated to the new rule-set. It's always the simple things.

Thank you, your response was greatly appreciated.

Frank

> > I have CARP running on a master and a slave server and for some unknown
> reason 
> > the slave continues to classify itself as a master, even though the
> advskew is 
> > higher than on the master. 
> > It appears that queries sent to the CARP ip address go to the master 50%
> of the 
> > time and the slave 50% of the time when both servers are up. This plays
> havoc 
> > with my databases as I synchronise them asynchronously.
> > 
> > When I take the carp interface down on the slave using 'ifconfig carp0
> down && 
> > ifconfig carp0 up' it lists it's status as 'backup' for about 10 seconds
> and 
> > then goes back to 'master'.
> 
> Have you by any chance firewalled out the multicast packets that CARP uses
> to test for interface death?  If either one of a CARP pair can't see CARP
> packets
> frequently enough it will think the other is down and promote itself to
> master.
> 
> If your firewall is blocking, then add a rule like this on both machines:
> 
> pass quick on $ext_if proto carp \
>     from $ext_if:network to $carp_mcast keep state
> 
> $carp_mcast is defined as "224.0.0.18"
> 
> 	Cheers,
> 
> 	Matthew
> 
> -- 
> Dr Matthew J Seaman MA, D.Phil.                   7 Priory Courtyard
>                                                   Flat 3
> PGP: http://www.infracaninophile.co.uk/pgpkey     Ramsgate
>                                                   Kent, CT11 9PW
> 
> 


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