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Date: Thu, 29 Nov 2012 11:43:16 -0600
From: dweimer <dweimer@dweimer.net>
To: FreeBSD Questions <freebsd-questions@freebsd.org>
Subject: CARP within VirtualBox Does it =?UTF-8?Q?work=3F?=
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I was trying to setup a test of CARP on two virtual machines running in 
VirtualBox 4.2.4r81684 I am not sure if I have something wrong with my 
CARP configuration or if VirtualBox just doesn't work right with it.  I 
can only ping the CARP interface IP address from the machine listed as 
MASTER, if I do an ifconfig carp0 down on the MASTER the other machine 
correctly switches form BACKUP to MASTER and then I can ping the 
interface from it but not from the Original system.

The VirtualBox systems are both using bridged networking, and the host 
cannot ping the carp0 IP address but can ping the interface IP address.

Before I go through more trouble shooting, does anyone know if CARP 
doesn't work with VirtualBox?

carp configuration
Machine1:
ifconfig_em0="UP"
ifconfig_em0_name="LAN"
ipv4_addrs_LAN="10.20.190.201/16"
defaultrouter="10.20.111.2"
cloned_interfaces="carp0"
ifconfig_carp0="vhid 1 advskew 100 pass ReduntantCarpTest 
10.20.190.203/16

ifconfig carp0:
carp0 flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
inet 10.20.190.203 netmask 0xffff0000
nd6 options=29<PREFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
carp: MASTER vhid 1 advbase 1 advskew 100


Machine2:
ifconfig_em0="UP"
ifconfig_em0_name="LAN"
ipv4_addrs_LAN="10.20.190.202/16"
defaultrouter="10.20.111.2"
cloned_interfaces="carp0"
ifconfig_carp0="vhid 1 pass ReduntantCarpTest 10.20.190.203/16

ifconfig carp0:
carp0 flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
inet 10.20.190.203 netmask 0xffff0000
nd6 options=29<PREFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
carp: BACKUP vhid 1 advbase 1 advskew 0

FreeBSD version is 9.1RC3 on both test machines.

-- 
Thanks,
    Dean E. Weimer
    http://www.dweimer.net/