Adding a VLAN to the Wi-Fi Interface
MacBook Pro, Mac OS X (10.6.2), 2.33 GHz Intel Core 2 Duo
I've found a workaround using terminal. It would have been nice to have the ability to do it through system preferences!
sudo ifconfig vlan1900 create
sudo ifconfig vlan1900 vlan 1900 vlandev en1
sudo ifconfig vlan1900 inet 10.0.0.1 netmask 255.255.255.224
Adding a VLAN to the Wi-Fi Interface