dhcp server running on a windows 2003 server

Posted on 2005-05-02
Last Modified: 2010-04-10
i have client complaining that they are getting ip conflicts they are all on dhcp how do I go about fixing this?
Question by:eberhardt2329
    LVL 95

    Expert Comment

    by:Lee W, MVP
    Find the conflict.  Something's probably set statically.  Or perhaps they installed a Wireless Router recently and didn't turn off it's DHCP server?
    LVL 2

    Expert Comment

    Do you have static assigned printers?  Statiic assigned access points?

    Easiest way to find the answer without searching and downloading is to change the DHCP scope to a different subnet.  Then Power cycle the switch they are all plugged into. (this will force a /release /renew on all the PCs) Each one will get a new IP, the node that was causing the problem will lose connection as it is no longer on the subnet.  Find the broken node and fix it.

    LVL 3

    Expert Comment

    When you have a conflict, the client states the conflicting PC's MAC address. You should check to see if you have the MAC address listed. I agree with leew that it has to be a static setting.

    If you cannot identify the offending MAC, go to and place the first 3 octets of the MAC to tell you who the manufacturer of the device (and possibly the PC).

    Also, in the client conflict IP screen, it will mention if the PC's connection will work or not (the first PC with the IP will continue to work, while the second one will not). If the PC you are at states that TCP/IP is disabled until the conflict is resolved, then use a program like Angry IP ( and you can get the PC's hostname.

    Finally, if all else fails, release and renew the IP on the client PC with problems or make the DHCP scope bigger to avoid running out of IPs.

    Good luck...
    LVL 3

    Expert Comment

    All the above is good answer.
    I would try to use different DHCP Range.
    It may save some time.

    LVL 4

    Expert Comment

    Also check how many free addresses left in your scope.
    LVL 3

    Accepted Solution


    Check following:

    How many DHCP servers are running and what scops they have.

    Some people using static IP.

    hope you find the problem this way, and let me know.


    LVL 95

    Expert Comment

    by:Lee W, MVP
    Please indicate which part of the comment solved your problem.  

    Featured Post

    Looking for New Ways to Advertise?

    Engage with tech pros in our community with native advertising, as a Vendor Expert, and more.

    Join & Write a Comment

    What is IRC? IRC (Internet Relay Chat) is a form of communication between multiple users. It is available freely to anyone with inernet access. IRC is a great way to communicate with others e.g. There is an IRC channel for Ubuntu Linux, which is fo…
    #Citrix #Citrix Netscaler #HTTP Compression #Load Balance
    Here's a very brief overview of the methods PRTG Network Monitor ( offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…
    In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor ( If you're interested in additional methods for monitoring bandwidt…

    729 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    20 Experts available now in Live!

    Get 1:1 Help Now