Cannot connect 2 WoW accounts at the same time

[droberts]

Thank you for your reply, but no such luck :-( DMZ didn't fix the problem, and I can't connect my PC directly to my modem (Mac Address restriction by ISP) guess it's the end of the road

[Farleito]

Mac Address restriction by ISP

Your ISP will only lease you 1 IP address. You will need to reset your cable/dsl modem when you switch between your PC and your switch. If you simply move the cable from your switch to your PC, your PC will try to negotiate a DHCP IP address and since your modem has already done this with your switch, it will not give you one assuming this is a 2nd computer. This is why you have to use NAT. It "tricks" your modem into thinking you only have 1 PC.

DMZ didn't work? Did you turn off all of the port forwarding?

When you have both clients up and connected (or trying to connect), go to the cmd prompt (Start -> Run -> cmd ) and type in netstat -an and post your results.

Edit:

You should see an IP address that matches your realms IP address.