Problems with Internet connection

[sorinn]

I've plugged into my laptop the LAN cable from my desktop computer and the Internet connection works for a few seconds, then in Vista becomes Local Access Only, then drops...then works again for a little bit and so on.

From my laptop, I can't ping the default gateway ( router's interface ).

I've set up the same IP information , hostname & MAC address as on the desktop computer on the laptop, but it doesn't work.

A possible solution?

The router is under ISP's administration.

[nitroshift]

Under the connection properties make sure the IPv6 is unticked