here is what i get when i type in ifconfig en0 into terminal.

en0: flags=8863 mtu 1500

inet6 fe80::203:93ff:fe1b:7ab6%en0 prefixlen 64 scopeid 0x4

inet 192.168.2.2 netmask 0xffffff00 broadcast 192.168.2.255

ether 00:03:93:1b:7a:b6

media: autoselect (100baseTX ) status: active

supported media: none autoselect 10baseT/UTP 10baseT/UTP 10baseT/UTP 10baseT/UTP 100baseTX 100baseTX 100baseTX 100baseTX 1000baseT 1000baseT 1000baseT

going from mine the first IP is what you want (the one next to inet), the second IP means nothing for this, all that second IP shows you is the range the final number can go up to (which means 2-225, since 1 is being used for the router for me).

going from mine (as a example) i would set the following in the Wii as

IP : 192.168.2.3

Mask : 225.225.225.0

gateway 192.168.2.2

the run dig this is toward the bottom of all the text

;; Query time: 217 msec

;; SERVER: 192.168.2.1#53(192.168.2.1) (you want the IP from this line)

;; WHEN: Sat Feb 2 18:13:50 2008

;; MSG SIZE rcvd: 436

and for the DNS server settings on the Wii i would put

primary : 192.168.2.1

secondary : 192.168.2.1

yours might be different then mine, just post what terminal shows you if you are not sure and i will see what i can do to help. plus it will help to tell me what Mac you are using and what version of OS X.