HOWTO START VDE WITH TAP BY NON-ROOT USERS
(tested on FreeBSD 6.2)

- Look at output of "kldstat" for module "if_tap.ko",
  if you can't find it do "kldload if_tap.ko".
  Remember to do
  	# echo "if_tap_load=YES" >> /boot/loader.conf
  to load it automatically at startup.

- Allow users to open tap interfaces:
 	# sysctl net.link.tap.user_open=1
  Remember to do
  	# echo "net.link.tap.user_open=1" >> /etc/sysctl.conf
  to enable it automatically at startup.

- Adjust devfs rules (assuming your users belong to 'vde' group):
	# echo "own tapN root:vde" >> /etc/devfs.conf
	# echo "perm tapN 0660" >> /etc/devfs.conf
  N is interface number, use tap* if you want the same behaviour
  for each interface.

- Create an interface:
	# ls /dev/tap0
	# /etc/rc.d/devfs restart

