[smittyd]

Hello. I have a cable modem and router (Gearnet) hooked to my computer. I would like to periodically change IP address'. I am able to change the IP address when I take the router out of the loop and just use the modem. But when I re-install the router, the original IP address comes back. I am not ever able to change IP address' while modem and router is hooked up. What needs to be done to be able to keep new IP address' the original way I did it? Plus, is there a way to change the IP address even when modem and router are hooked together.
I am running XP. I am using Road Runner cable. Thanks...

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Your Internet Service Provider (RoadRunner) is the one that assigns your external IP Address.

[SpywareDr]

Your Internet Service Provider (RoadRunner) is the one that assigns your external IP Address.

[smittyd]

Thanks for your reply. Let me ask this: If that's the case about RR, then why did my IP address change when I took the router out of the loop? Thanks...

[SpywareDr]

When you add a router, you're adding one of the three private IP Address ranges that can only be used for local LANs:

10.0.0.0 – 10.255.255.255
172.16.0.0 – 172.31.255.255
192.168.0.0 – 192.168.255.255

(These three 'private' IP Address ranges cannot be routed across the internet).

However, your external, public, internet-facing IP Address will still be one that belongs to RoadRunner.

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Try it. First, with no router:

• Drop to a cmd prompt and type:
  
  

  ipconfig /all

• Then in your browser, go to http://www.whatismyip.com
  
  The IP addresses reported by both of the above should be identical, and, they will be one that belongs to RoadRunner.

Now hook up your router and try both 1) and 2) again. Your LAN IP Address (ipconfig /all) will have changed to one of the three private IP Address ranges listed above, and your external IP Address will still be one that belongs to RoadRunner.

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Wikipedia > Network Address Translation
http://en.wikipedia....ess_translation

Wikipedia > http://en.wikipedia....Private_network
http://en.wikipedia....iki/192.168.1.1