Hi. I bought the a linksys Wireless - G ADSL gateway, the model is linksys WAG54G
Pretty much it is a wireless router with a built in ADSL modem with 4 ethernet connections.
Unfortunately it caused huge latency issues with World Of Warcraft (european server). The lagging has been severe all the time eversince. Even though I enabled DMZ for my computer (connected to the router through ethernet cable), according to the help in the router settings it exposes the pc to all ports, in other words it allows my pc to have full access to the internet, hence no port forwading was necessary.
I then tried
Turning of the DMZ
Doing the necessary port forwarding for World Of Warcraft
It helped a quite but the game was still too laggy.
Next I tried disabling the firewall in the router. Didn't make any difference
I tried using my old ADSL Modem instead of the ADSL router to connect directly to the internet, the game worked fine.
The problem must be from the router then. Unfortunately I have to return my old ADSL modem to my ISP, so I am stuck with the ADSL router.
the DMZ or the port forwarding I tried above should have fixed it. For some reasons neither worked!!
My firmware version is 1.00.19, I checked the website, the one I have already is the latest