A way to simulate the arp.balance of the carp in freebsd 11.x

carpcontrol.sh

#!/bin/sh

if [ "$2" == "MASTER" ]; then
    if [ "$(echo $1 | grep em0)" ]; then
         ifconfig em0 ether 08:00:27:2c:95:00
    fi
    if [ "$(echo $1 | grep em1)" ]; then
         ifconfig em1 ether 08:00:27:ef:b4:00
    fi
fi

if [ "$2" == "BACKUP" ]; then
    if [ "$(echo $1 | grep em0)" ]; then
         HW="$(ifconfig em0 | sed -n -e '/hwaddr/p' | grep -o -E '([[:xdigit:]]{1,2}:){5}[[:xdigit:]]{1,2}')"
         ifconfig em0 ether $HW
    fi
    if [ "$(echo $1 | grep em1)" ]; then
         HW="$(ifconfig em1 | sed -n -e '/hwaddr/p' | grep -o -E '([[:xdigit:]]{1,2}:){5}[[:xdigit:]]{1,2}')"
         ifconfig em1 ether $HW
    fi
fi

Hi, could you please elaborate more about this and your setup, I am trying FreeBSD 12 (no hwaddr ) but having lots of messages like:

   arp: 187.23.7.203 moved from 5c:5e:ab:09:81:f0 to 5c:5e:ab:01:c7:f0 on vlan0

My guess is that it could be related to how carp is dealing with the arp.