carp(4) on FreeBSD 8.2

Victor Sudakov vas at
Thu Dec 15 05:35:35 UTC 2011

Matt Mullins wrote:
> I've used carp very successfully in the past, both in the standard
> mode and ARP load-balancing mode, to build fail-over sets of
> firewalls.  It worked well enough that one of our firewalls was down
> for a week before we noticed (and none of our clients did).  I just
> did a mock-up of your scenario on a system at home (using the GENERIC
> kernel), and it seemed to work for me.
> I see you have a managed switch; you might see if some features like
> port security are disabled for that port.

It turned out even more interesting. The lab is virtual, and
promiscuous mode was prohibited in the virtual NICs' properties on the
hypervisor. Thanks to all who responded.

Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
sip:sudakov at

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