twizzle wrote:
my tower with a pci 10/100 fastethernet card connects with a straight rj45 cable striaght into my livebox router.
All computers connect to a router and/or switch with a straight cable. Depending on the intelligence of your switch, a crossed cable will also work, but the straight cable is standard.
Simple rule: if you want to connect two computers directly to each other, use a crosscable. If you are using a switch/hub/router or something like that, use a straight cable.