This is the fastest and simplist way
ok first of you need to config your router to get access to you router
you need to open up your internet explorer then put in this ip
http://192.168.1.1 you should then get a control pannel etc you need to
goto the advanced then Virtual server and put you pc's ip in the DMZ
then apply setting and you done (
just remember to remove your pc from the dmz when you have finished)
to find your internal ip go to control panel then network and double click
on your router or modem then select support and it should show you in there its normaly 192.168.1.2 if there's only 1 machine connected.
Now the server config i have attached a server config to this post
that i know works and is a standard set up all you have to do is edit
the name to what you want and thats it run the server and your m8 should be able to see it in the list. you won't cause your hosting it
you will need to go to join a specific game then local network and put
in your internal ip and the admin password the port should already be
in there and away you go