FAQ - IP conflicts - What to do - Win2K, XP and Vista


I get an IP conflict error message on my Windows 2000 or XP computer when I boot up and try to log in. What's going on? How do I fix it?


An IP address is a unique number assigned to each computer on a network. If there is more than one computer with the same IP address, each computer will get the IP conflict error. The Help Desk attempts to maintain a database with all of the IP addresses and to whom the addresses are assigned.

IP conflicts on the ISU campus usually occur for these 2 reasons.

When you receive an IP conflict message, Please gather the following information:

  1. The exact content of the IP conflict message, i.e., the conflicting physical address.
  2. The computer network configuration information.
    To get that, open a command window:

    Windows 2000 or XP

    1. Click START
    2. Click RUN
    3. Type cmd in the box and click OK

    Windows Vista

    1. Click START (round Windows flag)
    2. Click All Programs
    3. Click the Accessories folder
    4. Click RUN
    5. Type cmd in the box and click OK

  3. At the prompt, type ipconfig /all - A box will pop up.
  4. Collect the following information:

    1. Physical Address
    2. IP Address
    3. Subnet Mask
    4. Default Gateway

  5. Close the CMD window - type exit and hit the enter key.
  6. Note the building and room number is where the computer is located and the TAG number.

Once you have gathered the required information, please call the Help Desk at 282-HELP for assistance.

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Category: Internet/Network Access     Platform: All Windows
Document #: 206     Author: Cynthia Senicka    
Last Modified by: Cynthia Senicka on 12/20/2007