sbs 2008 shows several PC's with the same IP Address?

Posted on 2011-04-18
Last Modified: 2012-05-11

Strangest thing? When I am logged in to the SBS2008 Server and I ping a Client eg. Frontdeskpc it replies in the CMD prompt e.g. If I then ping another PC eg. FrontdeskPC2 it replies with the same IP Address? (for a different machine). If I go the the actual machines, they do not have the same address, they have correctly being assigned an IP from the SBS2008 DHCP Server yet SBS2008 still thinks they have the same IP. This is messing up my RWW, when I try and access a machine remotely, I select the correct PC name, but it then logs me into the wrong machine? As if the Active Directory is not getting updates from the DHCP?  Not sure if this is a DNS Problem. I have tried flushing the DNS Cache, restarting the DNS and DHCP Services to no avail. Not a critical problem, just rather frustrating? Any ideas?

Regards and Thank You

Question by:duzbin
    LVL 56

    Accepted Solution

    It is DNS, but not the DNS cache. At some point a machine or two registered their IP with the DNS server and it has stale information. My recommendation would be to open the DNS snap-on on the server (one of the few times you *don't* do something in the SBS console), find your internal forward-lookup zone, expand it, and delete each "A" record for a machine that is reporting the wrong IP. Once the machine is rebooted, it's DHCP lease will be renewed and the proper DNS entry should be created and updated.

    Accidentally deleting a record in DNS that shouldn't be (a non A record, a subtree of AD, etc) can be very bad, so as always, make a backup *IMMEDIATELY* prior to making any changes of this sort.

    LVL 1

    Author Comment

    Thanks will give it a try and let you know.


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