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Duplicate IP Adresses

My roommate and I have a problem. We have the same IP address. This started a few days ago and I don't know how to change the settings, preferably automatically. He has a desktop and I have a laptop.

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marked as duplicate by Gilles, hyperslug, Dennis Williamson, Sathya, William Hilsum Sep 13 '10 at 23:06

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

What operating systems do you use? Did either of you do any specific networking configuration? Did you try rebooting, or at least unplugging from the network and plugging back in? What is your network setup (e.g. both connected to <router brand> configured <so>)? – Gilles Sep 13 '10 at 22:50
Duplicate, answered – Moab Sep 13 '10 at 22:51

Just to rule out a basic misconfiguration, go to the command prompt and type

ipconfig /renew

if this doesn't fix it then, go to Network Connections (Vista/7 go to Network and sharing Center then click Change adapter settings on the left or in XP, go to Control Panel > Network Connections).

Now, right click on the adapter you are using and find 'Internet Protocol Version 4 (TCP/IPv4)`.

Make sure automatic is set for at least the top one and your alternate configuration, unless you have a reason to have it manually set.

alt text

If there is a reason you need a manual address (Such as no DHCP source), consider simply changing the last number in the IP to something that no other device is using.

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