Computer-to-computer via PATCH-STP cable

I am struggling with a few kinds of, computer-to-computer network issues.
I am trying to do some sharing between a Mac Pro Intel (late 2007 2 x 2.66 GHz Dual-Core) and a white MacBook (early 2010 2.26 GHz Intel Core 2 duo), both OSX 10.6.5 via a cable.
The MacBook can connect to the Mac Pro but not vice versa, the file sharing 'works' in both direction but only from the MacBook's desktop. The Mac Pro 'sees' the MacBook as a server to which it can't connect, the MacBook has no problem in finding and connecting to the Mac Pro.
Internet sharing is impossible too, by Patch-STP cable (not by AirPort what I don't use), in both directions.
The strangest thing of all is that it worked before in the very same configuration till, after a trouble with LR3.3, I had to restore the OSX wit the Snow Leopard install disc.
Both computers can connect to the internet separately, on by one, through the same cable, that's why I want to share the internet from the Mac Pro to the MacBook.
I think that the issue might be situated in the System preferences —> Network settings, but I can't identify the problem nor can I correct it. The sharing settings seems to be OK, I hope so...
Any ideas, please?
Thanks,
Philippe
P.S. Do forgive my very weak English.

Buy a router. They are cheap and designed for what you want to do. It doesn't need to be an apple router.

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