problem thru Linksys router

External Since: May 25, 2004 Posts: 3

I have 2 computers running XP Home (a desktop and a laptop), each connected
to a Linksys WRT54G broadband router (it's a wireless router, but I'm not
even using that aspect of the product), which is in turn connected my
Motorola SB4200 Surfboard cable modem. The whole set-up worked fine the
past 5 days, but since then ONE of the computers (the laptop) has lost all
connectivity to the Net. The desktop connection has remained fine.

I have isolated the problem to be with the Linksys router. If I bypass it
altogether and connect an Ethernet cable from the cable modem to the laptop,
I connect to the Net fine. However, when I insert the router between the
two, I lose all Internet connectivity on the laptop. Interestingly, the
desktop works fine, so I know the router works. I even tried using the 4
different ports on the router to make sure that one of them wasn't
defective.

Can anyone give me some things to check and/or try? I have listed as much
relevant info below. Thanks!

(from Linksys router screen, DHCP setup screen)
DHCP Server is enabled; desktop is the only client listed in the DHCP
Clients Table (the address for the desktop computer is listed as
192.168.1.101)

The laptop is a recently purchased new computer (set up on 5/20, worked
until 5/24). When I type ipconfig at the command prompt, I get the
following:

IP Address: 10.0.0.9 (! this definitely seems wrong !)
Subnet Mask: 255.255.0.0
Default Gateway: (blank) (! the desktop, which works fine, displays
192.168.1.1 here)

From the laptop, I can successfully ping 10.0.0.9 and 127.0.0.1, but NOT
192.168.1.101 (the desktop computer) nor 192.168.1.1.

From the desktop, I cannot ping 10.0.0.9 (supposedly the laptop computer).

External Since: Nov 17, 2003 Posts: 77

gurdude wrote:

> I have 2 computers running XP Home (a desktop and a laptop), each connected
> to a Linksys WRT54G broadband router (it's a wireless router, but I'm not
> even using that aspect of the product), which is in turn connected my
> Motorola SB4200 Surfboard cable modem. The whole set-up worked fine the
> past 5 days, but since then ONE of the computers (the laptop) has lost all
> connectivity to the Net. The desktop connection has remained fine.
>
> I have isolated the problem to be with the Linksys router. If I bypass it
> altogether and connect an Ethernet cable from the cable modem to the laptop,
> I connect to the Net fine. However, when I insert the router between the
> two, I lose all Internet connectivity on the laptop. Interestingly, the
> desktop works fine, so I know the router works. I even tried using the 4
> different ports on the router to make sure that one of them wasn't
> defective.
>
> Can anyone give me some things to check and/or try? I have listed as much
> relevant info below. Thanks!
>
> (from Linksys router screen, DHCP setup screen)
> DHCP Server is enabled; desktop is the only client listed in the DHCP
> Clients Table (the address for the desktop computer is listed as
> 192.168.1.101)
>
> The laptop is a recently purchased new computer (set up on 5/20, worked
> until 5/24). When I type ipconfig at the command prompt, I get the
> following:
>
> IP Address: 10.0.0.9 (! this definitely seems wrong !)
> Subnet Mask: 255.255.0.0
> Default Gateway: (blank) (! the desktop, which works fine, displays
> 192.168.1.1 here)
>
> From the laptop, I can successfully ping 10.0.0.9 and 127.0.0.1, but NOT
> 192.168.1.101 (the desktop computer) nor 192.168.1.1.
>
> From the desktop, I cannot ping 10.0.0.9 (supposedly the laptop computer).
>
>
>

I don't really suspect the LAN cable, but since it is so easy to check,
I suggest swapping LAN cables with your desktop just to eliminate that.

Your IPA is wrong. Try setting the IPA manually to 192.168.1.102 and the
mask to 255.255.255.0. If that makes everything work, then try setting
the laptop to be a DHCP client, then reboot.
--
Cheers, Bob