I've just found out I don't have a router. There is no router in this network. I have a public Ip, and, in front of my house there is a MC + switch.
The switch doesn't know wich application datas travel thru him. The only thing a switch does is to get those bytes moving thru him. He can't make a difference between rFactor Kbytes and Race07 Kbytes.
As far as I'm concerned, anything related to my connection except my PC starting with the network card is out of the question.
So, is it a game bug after all? I'm getting nuts in here, I've bought the game to play it offline, geez.
My sister should get back from France at the end of this month. He's bringing me a laptop which is just perfect to test Race07 on it.
If this won't solve the problem, I'm out, going to play Tetris instead, at least that's working.