with the older code, gif(4) interface goes to IFF_UP state with
	physical (outer) address configuration, like:
		# gif0 goes to IFF_UP mistakenly after this
		ifconfig gif0 tunnel A B
	the behavior is now corrected.  if you have gif(4) configuration in
	your system, and relied upon the behavior, you will need to add a
	line to bring the interface up.
		ifconfig gif0 tunnel A B
		ifconfig gif0 up

itojun