"IP address conflict" - Ethernet connection

I have 2 computers connected via ethernet to my router. My computer got no problems. But my brother's computer is connected but has a very limited speed (even if I log out of mine). It is said that he got a "IP address conflict. (we are both using Win7)

Someone else has experienced this problem and has a solution?
Recently, we have replaced our old router and modem broadband.

Hi Eivind,

An IP address conflict occurs when two computers on a LAN (local area network) or the Internet were assigned to the same IP. IP conflicts between two computers normally make one or unusable both for network operations.

Method 1: You can try to reset the stack TCP/IP go to this article and either click on "Fix it for me" or follow the instructions to fix it yourself:
http://support.Microsoft.com/kb/299357

Method 2:

Using the troubleshooter from network in Windows 7
http://Windows.Microsoft.com/en-us/Windows7/using-the-network-troubleshooter-in-Windows-7

Method 3: Temporarily disable the security software and firewall settings and check if the Internet connection drops.

Note: Antivirus software can help protect your computer against viruses and other security threats. In most cases, you should not disable your antivirus software. If you need to disable temporarily to install other software, you must reactivate as soon as you are finished. If you are connected to the Internet or a network, while your antivirus software is disabled, your computer is vulnerable to attacks.
 
For more information:

Wireless and wired network problems

http://Windows.Microsoft.com/en-us/Windows/network-connection-problem-help#network-problems=Windows-7&V1H=win8tab1&V2H=win7tab1&V3H=winvistatab1&v4h=winxptab1

Let us know if you have other questions about Windows in the future. We will be happy to help you.

Tags: Windows

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