I have 8 computer in my house, 2 mac laptops, 3 windows 7 laptops and 3 windows7 desktops. Only 2 windows7 desktops(my brothers and mine) are connected by a lan cable to the modemrouter (Billion 7800N).
The problem is whenever my brother turns his computer on the internet disconnects for about 30 seconds, which is a pain when playing games online.
I read somewhere that I need to change his ip address or something, hopefully someone can explain to me what to do in a more simple manner.