Using lagg(4) with diskless booting

The lagg interface enables transparent failover between (eg) wired & wifi interfaces - making it trivial to combine the flexibility of walking around the house without any cables with the throughput of a wired interface.

For a normal boot environment, this is as simple as placing something like the following in /etc/rc.conf:

ifconfig_re0="up"
ifconfig_ath0="ether 00:1e:68:aa:bb:cc"  # Set WiFi MAC address to match wired MAC address
wlans_ath0="wlan0"
ifconfig_wlan0="WPA"
cloned_interfaces="lagg0"
ifconfig_lagg0="SYNCDHCP laggproto failover laggport re0 laggport wlan0"