nigelivey :
I very much doubt, if its a domestic router, that it supports VLAN or VLAN tagging. If you have set up port forward correctly the only time you have open ports is when the application opens them. Sounds like you have messed with someone online and they are threatening you!!
To be honest I havent messed with anyone, my gf gave me a computer for my birthday and I've already built 2 others... So I decided to turn it into a server system just too run some games off of and a teamspeak server. I am new to server admin and doing things like this, so I always like to look into any risk I may encounter