[ubuntu] need help in making internet between 2 computers

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http://ubuntuforums.org – Hi, i have two computer first one is the main computer, he is connected to the internet throught DSL ubuntu 10.10 beta installed the second is ubuntu 9.10, and i want this computer to connect to the internet of the first computer they both connected to a B-FOCUS router 270pr but i dont want to make the router to be the one that connects to the internet i want the first computer will connect to the internet and the second will be accessing the internet of the first computer connection. how can i do it? (HowTos)