Geez, you bumped it 6 minutes after your first post. I'm aware that the static IP is for 10.4, however the steps are near identical. If you'd like any extra information on any section, ask.
There are four items that all need addressing before you can host
1) You need a static IP address
See here
http://www.portforward.com/networkin...ic-Mac10.4.htm
2) Warcraft needs a port setup
Load Warcraft and go to Options -> Gameplay. Look at the Game Port. This will be used in the next step (you can change it if you wish as well - default is 6112)
3) Your router needs a rule defined
Here is a list of routers
http://www.portforward.com/english/r...outerindex.htm
You will need a make and a model number of your router (should be written on it - possibly on a sticker underneath). Just find it in the list and then click Warcraft afterwards
4) You need to either disable the OS X firewall or create a rule for Warcraft allowing incoming connections (doesn't work too well from my experience)
System Preferences -> Security -> Firewall
