UCARP IP Failover between Jails on different Machines

[UCLAGeek]

Hi guys,

I have two machines in a data center. I've created three jails on the main server (HostA). I want HostB to be a failover over for HostA and its jails. Each host has two NIC's using CARP for load balancing. What I am trying to do is have each jail on HostA failover to it's twin on HostB. Now I know CARP will not work in jails but I thought UCARP might except I keep getting an error

 ifconfig: ioctl (SIOCAIFADDR): permission denied

Is it possible to do this? Or is IP aliasing just out of the question for jails? If so do you have any recommendations for possible solutions?

This is my /etc/rc.conf for HostA

ucarp_enable="YES"
ucarp_if="em0"
ucarp_vhid="1"
ucarp_pass="pass"
ucarp_preempt="YES"
ucarp_facility="daemon"
ucarp_src="192.168.1.1"
ucarp_addr="192.168.1.1"
ucarp_advbase="2"
ucarp_advskew="0"
ucarp_upscript="/usr/local/bin/ucarp_up.sh"
ucarp_downscript="/usr/local/bin/ucarp_down.sh"

And for HostB

ucarp_enable="YES"
ucarp_if="em0"
ucarp_vhid="2"
ucarp_pass="pass"
ucarp_preempt="YES"
ucarp_facility="daemon"
ucarp_src="192.168.1.2"
ucarp_addr="192.168.1.1"
ucarp_advbase="2"
ucarp_advskew="1"
ucarp_upscript="/usr/local/bin/ucarp_up.sh"
ucarp_downscript="/usr/local/bin/ucarp_down.sh"

My scripts are very basic:

ucarp_up.sh

#!/bin/sh
 
# Load variables from rc.conf
. /etc/rc.subr
load_rc_config ucarp
 
/sbin/ifconfig $ucarp_if alias $ucarp_addr/32

ucarp_down.sh

#!/bin/sh
 
# Load variables from rc.conf
. /etc/rc.subr
load_rc_config ucarp
 
/sbin/ifconfig $ucarp_if -alias $ucarp_addr/32

Thanks in advance for any help.