I highly suggest you use Mbcaster.
here are instructions:
First you need to download(dl) Hamachi
http://filehippo.com/download_hamachi/While you r "dl"ing it a made you this to read.
hamachi is a VPN (virtual private network) program that allows one to play another in many games across the internet while the games think you are playing on a network.
You will recieve another IP address (it wont mess up your old one.) and it will show up on the top of the client.
when hosting people will use this IP address.
When joining you will see there IP address and you will connect to it.
To play MBAC
any way there are networks you can join (servers)
Threre a lot for MBAC but alot are full.
Once you are connected you dont get disconnected.
(unless you want to)
when you shut it down and turn it back on you will regain the same members as you did before
Well now that you read my Hamachi tutorial have fun.
If you need anymore help you know where to find me.