How do I fix the problem of 'duplicate IP address'

Archived from groups: microsoft.public.windowsxp.help_and_support (More info?)

Explanation :-
I have a DSL modem (SpeedStream), and its output RJ-45 is
plugged into a Ethernet switch (D-link DSS-5+, 10/100 Mbits).
From the Ethernet Switch first output is plugged into my
'gateway' PC, and the second output is plugged into a Wireless
Router (D-link DI-524). The 'gateway' PC is the local server
for the rest of my home PCs. I keep the Wireless Router on
all the time, to connect the Wireless once in a while, through a
D-Link Wireless Cardbus Adapter (DWL-650) for my Laptop.
Since this was the easiest way to keep snoopers out of the
home network, for sometime all was working well.

Problem :-
Now when I turn on the Laptop, the common 'gateway' server
complains that it cannot serve a duplicate IP address, which is
(198.168.0.100), and the Internet stops on all PCs and the
Laptop.

The local file transfer works. The IP address happens to be the
Laptop's IP address, created by the Cardbus Adapter within
the Laptop. The remaining PCs are using different IP addresses
and the number of the 'gateway' is (198.168.0.1) as usual.
Gateway also has a regular IP for the DSLs address.

I wonder why does the 'gateway' pc sometime complains about
the duplicate IP address but as soon as I turn off the Laptop,
it quits complaining.

Help :-
Is there a way to re-allocate the IP address on the Laptop,
if so, do I need to remove and then re-load the CardBus
Adapter Software, or there is an easy way to do this?

Any suggestion will be highly appreciated.

Archived from groups: microsoft.public.windowsxp.help_and_support (More info?)

On Wed, 22 Jun 2005 17:06:18 -0500, O Noah wrote:

> Explanation :-
> I have a DSL modem (SpeedStream), and its output RJ-45 is
> plugged into a Ethernet switch (D-link DSS-5+, 10/100 Mbits).
> From the Ethernet Switch first output is plugged into my
> 'gateway' PC, and the second output is plugged into a Wireless
> Router (D-link DI-524). The 'gateway' PC is the local server
> for the rest of my home PCs. I keep the Wireless Router on
> all the time, to connect the Wireless once in a while, through a
> D-Link Wireless Cardbus Adapter (DWL-650) for my Laptop.
> Since this was the easiest way to keep snoopers out of the
> home network, for sometime all was working well.
>
> Problem :-
> Now when I turn on the Laptop, the common 'gateway' server
> complains that it cannot serve a duplicate IP address, which is
> (198.168.0.100), and the Internet stops on all PCs and the
> Laptop.
>
> The local file transfer works. The IP address happens to be the
> Laptop's IP address, created by the Cardbus Adapter within
> the Laptop. The remaining PCs are using different IP addresses
> and the number of the 'gateway' is (198.168.0.1) as usual.
> Gateway also has a regular IP for the DSLs address.
>
> I wonder why does the 'gateway' pc sometime complains about
> the duplicate IP address but as soon as I turn off the Laptop,
> it quits complaining.
>
> Help :-
> Is there a way to re-allocate the IP address on the Laptop,
> if so, do I need to remove and then re-load the CardBus
> Adapter Software, or there is an easy way to do this?
>
> Any suggestion will be highly appreciated.

The duplicate IP is being shared by ICS and the router. 198.168.0.1 may be
hardcoded to the router. It is hardcoded to ICS (and consequently the
gateway computer).

You may want to repost this question in the windowsxp.network_web
newsgroups. Your solution will involve some changes in your network setup
to avoid the duplicate IP and possibly some bridging to get internet access
for both the wired and wireless portions. The network gurus in the other
newsgroup will be able to tell you the most "graceful" and efficient way of
doing that.

--
Sharon F
MS-MVP ~ Windows Shell/User