Yes but the router is upstairs and the pc access to it via a wifi card installed. The another card with the crossover cable goes to the amiga. At the moment is impossible to get a cable from the amiga directly to the router.
Ok, a stupid question then.
Are you shure it is a x-link cable?
Does it have metal casings outside the RJ45 connector?
If not, it is not a x-link cable.....
EDIT: unless it is home made then... :-D
Buy a new cable...
EDIT: You can also try easier ip addresses outside the router loop. Like using 100.0.0.X between pc and miggy.
Just remember to set subnet mask to 255.255.255.0