Vrrp/CARP/UCarp Problems

Dmitriy Kirhlarov dimma at higis.ru
Fri Mar 30 06:44:18 UTC 2007

On Sun, Mar 25, 2007 at 07:23:50PM +0100, Ross Draper wrote:

> CARP - Pro's: stable and built into the kernel. Could enable acive/active
> arp load sharing at a later point.
> Cons: There is a Freebsd bug (I've seen it discussed on the lists where
> the creation and destroyal of a carp interface causes a kernel panic.

I use it without panics half year.
How many carp interfaces must be configured for reproduce panic? Is
net.inet.carp.preempt used?

> Also, there is no support for start/stop scripts.

Use ports/net/ifstated for run init scripts.

> Freevrrpd - Pros: Mac address changing removes some of the arp timeout
> issues/gratuitus arp problems and it supports start/stop scripts
> Cons: I'm finding that upon rebooting the backup unit it correctly starts
> as a backup, then three seconds later syslogs that it is the master and
> changes its mac address accordingly. although a sniff of the network
> traffic indicates it is sending the right advertisements, it never goes
> into backup mode again.

Look like you have same "priority" on both nodes. It's work only with


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