Building the Network You Need with OpenBSD's PF: BSDCan, Ottawa May 6th, 2009
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# CARP: ifconfig

on the master

    $ sudo ifconfig carp0 192.0.2.19 vhid 1
    $ sudo ifconfig carp1 192.168.1.1 vhid 2

on the backup

    $ sudo ifconfig carp0 192.0.2.19 vhid 1 advskew 100
    $ sudo ifconfig carp1 192.168.1.1 vhid 2 advskew 100

the master announces every (1 + 0/256) seconds

the backup announces every (1 + 100/256) seconds

Note Multicast. Use `carppeer` option for unicast

Also see Henning Brauer's notes