LAN card not work with Laptop

[bigworld005]

Hi,All,
DELL Latitude CPX Laptop with XP Pro + SP2 .

I try to use WIRED internet at home, since the old CPX has no netwrok card, I use a USB LAN adaptor. when I use a CAT5 cable connect the adaptor to my cable modem, the computer keeps trying to acquire IP address, and failed finally,which shows it has limited or no connection(the yellow triangel shows up).

however, when I put my router in the middle, it work. the whole process is :

jack in the wall--> cable modem-->router-->usb adaptor--> laptop.

but if take the router out, hook the adaptor directly to the modem, it fails.

to be clear, my router is Belkin wirless router but it is also a switch ( has 4 ports back). I plug the CAT5 cable to any of 4 and it works.

the other thing is I also have a desktop at home: it has a LAN card and works fine either with router or dirctly hooked to cable modem.

I guess some setting on laptop is messed up, so anyone could tell me what is it?


by the way, I run a "ipconfig/all" with the LAN adaptor hooked to the Modem. and the results is uploade to my yahoo album:

http://pg.photos.yahoo.com/ph/bigworld005/detail?.dir=7210&.dnm=ba6e.jpg&.src=ph

regards,
T

 

[Trizoy]

If you plug the usb adaptor straight to router, the router makes the connection to the isp.

If you plug the adaptor to the modem there is nothing to make the connection, unless you sepcifiy it in the netowrk properties...