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Date: Tue, 13 Jun 2006 16:24:17 +0200
From: Erik Norgaard <norgaard@locolomo.org>
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To: Ashley Moran <work@ashleymoran.me.uk>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Where is CARP?
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Ashley Moran wrote:
> Hi
> 
> Am I missing something here?  I'm running FreeBSD 6.1/amd64 and I can't see 
> any sign of CARP.  The man page is there but very little else:
> 
> $ sudo ifconfig carp0 create
> ifconfig: SIOCIFCREATE: Invalid argument
> 
> $ sysctl -a | grep carp
> net.inet.ip.same_prefix_carp_only: 0
> 
> I thought maybe it was a kernel option, but I can't see that either:
> $ cd /usr/src/sys/amd64/conf && grep -i carp *
> <NOTHING>
> 
> And I thought it might be a KLD:
> $ cd /boot/kernel && ls *carp*
> ls: *carp*: No such file or directory
> 
> Where is it hiding and how do I enable it?

See the NOTES filefor extra kernel options, /usr/src/sys/conf/NOTES:

device          pf                  #PF OpenBSD packet-filter firewall
device          pflog               #logging support interface for PF
device          pfsync              #synchronization interface for PF
device          carp                #Common Address Redundancy Protocol

Cheers, Erik