Broadcast Standards
The Wii works with routers that use either the 802.11G/ or 802.11B WLAN standard. This number refers to the signal frequency and the routers bandwidth. 802.11B routers have a bandwidth of 11MB per second while 802.11G/ routers have a bandwidth of 56MB per second. The information for your particular router can usually be found on the box it came packaged in or on the router unit itself.
Security
The Nintendo Wii is only compatible with WEP, WPA and WPA2 router encryption methods. WEP encryption uses a static number as an encryption code to secure the router while WPA encryptions use a passphrase that you come up with yourself. If your router does not support these encryption types, you will have to disable the security settings on the router and connect to the unsecured network.
Router Brands
The Nintendo Wii currently supports routers made by the following companies that meet the previously mentioned criteria:
2Wire, 3com, Actiontec, Airlink, Ambit, Apple, Ativa, Belkin, Buffalo, Cisco, Cradlepoint, DLink, Dynex, Lynksys, Microsoft, Motorola, Netcomm, Netgear, Netopia, RCA, Siemens, SMC, Thompson, TRENDnet, TrueMobile, Ubee, US Robotics, Valet, Westell, Zoom and Zyxel.