If you have Intel NIC card, you are lucky. Intel PROset utility/driver allows you to add/remove VLAN
Realtek Diagnostic utility - is working on WINDOWS 7 without problems but WIN XP is problem.- depends on network card!
Windows Diagnostic Program | 2.0.2.3 | 2012/11/16 | 10394k |
http://www.realtek.com.tw/Downloads/downloadsView.aspx?Langid=1&PNid=13&PFid=5&Level=5&Conn=4&DownTypeID=3&GetDown=false
DiagnosticAllin1(2.0.2.3)_20121107.zip
lock vlan, ping test, gsm, lte, 3G