Win 7 Pro loosing IP address

Posted on 2012-08-16
Last Modified: 2012-08-17
I am running a three site Windows server 03 domain hosting mostly Windows XP, with a growing number of Windows 7 Pro Workstations. I only have one Server 08 machine, and it is a member server.

We have had several Win 7 machines running successfully for a couple months now, but over the last two weeks or so, I have noticed that from time to time, a machine will "Loose it IP", and automatically revert to the alternative IP scope built into the OS options. Once it does this, the user can't connect to the internet, or even any of the local server based resources.

Best case: I reset the IP config and it finds the correct IP and reconnects.

Worst case: Today, about half of my users, mostly Win 7 but also windows XP users could not connect to the network at all and reverted the the Alternative IP, a local profile, and no network drives.

This last issue was resolved only after I reset the network switch, router, and most of the users workstations. I was able to fix it, but I am still not sure what happened.

The only thing that has changed is I changed our DHCP scope to include more IP addresses (same IP scope, just more addresses included as available). Other than this, and some random Windows updates on the Win 7 machines, I can see nothing different.

Thanks in advance for your assistance.
Question by:RKoons
    LVL 12

    Accepted Solution

    Do you have DHCP running through your Server 2003 only? Do you have it turned off on the Router and all the other Servers?  Also, are you sure that no one has installed another Router maybe for wireless access?  I had a customer who had an employee bring in a Wireless Router and hook it up for his wireless to work and left the DHCP server on the Router enabled.  It proceeded to give more and more computers duplicate IP addresses.  Check this.

    Otherwise it may be an issue within your DHCP itself needing a reset as from time to time I've seen them stop giving out IPs.

    Good Luck HTH.
    LVL 1

    Author Comment

    O.. M.. G..

    Yes, It's time to go home now...

    The lesson of the day is:

    Never use an old router off the shelf as a network switch.

    I had TWO connected and serving like crazy...

    Thanks for pointing out the obvious!!!


    I read the first sentence and said... Oh S*#$!

    Good answer!
    LVL 12

    Expert Comment

    I'm glad it was an easy fix!  Sometimes we are so technical that we look over the obvious.  It's very common.  I do it all the time.

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