Subject: RE: question about CARP
To: 'Liam J. Foy' <>
From: George Chen <>
List: tech-kern
Date: 05/17/2006 12:32:33
Hi Liam,

I solved the problem.
The problem is caused by command
Ifconfig carp0 down.
Where carp0 is virtual interface. 
If I bring down the physical interface, to which carp0 binds, the failover
could happen!



-----Original Message-----
From: [] On
Behalf Of Liam J. Foy
Sent: 2006 05 11 16:35
To: George Chen
Subject: Re: question about CARP

On 11 May 2006, at 05:07, George Chen wrote:
> Sorry, there are so many lines.:)
> When I bring down carp0 on fw2 by 'ifconfig carp0 down', carp0 on fw1
> becomes MASTER, but carp1 on both sides remains unchanged.
> Sorry I didn't sync to head version, didn't use your patch neither.  
> Instead
> I checked your patch. My opinion is that this is a design bug. The  
> reason is
> that there is no mechanism to transfer the message of one carp  
> going from
> backup to master to all other carps on the same firewall. Without the
> message, how can other carp react to it?

No, preempt should do this. I'm going to try and get my network setup so
I can try. I'll let you know.

> What is my modification? There are bugs in arp balance, which also  
> exists in
> your patch. Additionally I'm making carp support for layer 2 HA and  
> bridge
> balance.

What are the bugs in arp balance? Have you let OpenBSD know of these  
you claim to have found?

> Cheers!
> George Chen

		Liam J. Foy