[ubuntu] Remote Desktop through Public IP

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http://ubuntuforums.org – I gave my brother my public IP address (79.xxx.xx.xx) and he want's to connect to me via remote desktop. How would he do so? How would I set up my computer to allow it? I can't connect to his via his PublicIP either. Help quickly? I'm on Ubuntu 10.04 Lucid Lynx I went to System -> Preferences -> Remote Desktop and chose "allow other users to view your desktop" He uses MAC He is NOT on the same network, or in the same house, as me. (HowTos)