The Wii FAQ is referring to a Stateful Packet Inspection option on the router. Disabling SPI is not the best option. Rather, you may want to set DMZ IP option in the advanced router settings pointing to the Wii's IP address.
Basically, SPI looks at the state of each connection and can protect you from rogue connections.
I am using a D-Link DIR-625 router hard wired to a Windows XP Professional PC computer. I am trying to get a wireless internet connection within my LAN for a Wii game console but I can't seem to do it. I do have a wireless internet connection in my LAN through this router for a laptop. On a Nintendo Wii FAQ web page, it is suggested that for my router I should disable the SPI firewall setting on the web page of my router settings.
I am a newbie with routers and I am not sure what the implications are for my router firewall if I disable SPI.
1) Will I still have an active router firewall if I disable SPI?
2)What does SPI do and what router firewall protection do I still have (if any) if I disable SPI?