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Win7- multiple machines with the same DNS but different DHCP IP

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  • Win7- multiple machines with the same DNS but different DHCP IP

    We are starting to see a lot of Win7 workstations coming up with the same IPs.

    For example, if I try to RDP to workstation L494, I end up going to workstation L797. If I do an NSLOOKUP on L494 & L797, I get the same IP: 192.168.1.25.

    I found in DNS\Reverse DNS on one of my AD servers that 192.168.1.25 was assigned to both workstations. Checking L494 locally, it was assigned IP 192.168.1.34 so I asked the desktop guys to run an IPCONFIG /FLUSHDNS & IPCONFIG/REGISTERDNS then reboot it. I'm waiting for the results.

    My question is, what could be the cause of this? It seems to be a growing issue and I cannot explain why.

    Thanks.
    |
    +-- JDMils
    |
    +-- Regional Systems Engineer, DotNet programmer & Jack of all trades
    |

  • #2
    Re: Win7- multiple machines with the same DNS but different DHCP IP

    rogue dhcp ?
    Please do show your appreciation to those who assist you by leaving Rep Point https://www.petri.com/forums/core/im.../icon_beer.gif

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    • #3
      Re: Win7- multiple machines with the same DNS but different DHCP IP

      How would you know?
      |
      +-- JDMils
      |
      +-- Regional Systems Engineer, DotNet programmer & Jack of all trades
      |

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      • #4
        Re: Win7- multiple machines with the same DNS but different DHCP IP

        Hi, in the 2nd half of this post we covered some DHCP/DNS settings which may apply here.
        http://forums.petri.com/showthread.php?t=64600
        Please remember to award reputation points if you have received good advice.
        I do tend to think 'outside the box' so others may not always share the same views.

        MCITP -W7,
        MCSA+Messaging, CCENT, ICND2 slowly getting around to.

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        • #5
          Re: Win7- multiple machines with the same DNS but different DHCP IP

          I think you'll need to look at the records in the zone and see if there's stale ones there.

          If not configured, you may want to consider turning on aging and scavenging on the forward and reverse lookup zones. Note that this needs to be turned on at both the server and the zone.

          More info:
          http://technet.microsoft.com/en-us/l.../cc754345.aspx
          Regards,
          Jeremy

          Network Consultant/Engineer
          Baltimore - Washington area and beyond
          www.gma-cpa.com

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