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client pulling out of scope i.p.!!

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  • client pulling out of scope i.p.!!

    okay, we've got our dhcp scope set from x.x.x.2 to x.x.x.99. all the clients are fine except one, which is pulling x.x.x.235. we've double checked the scope, released/renewed the client, and verified that the client is set to dynamic, as opposed to static.

    google and the mskb provided no help. anyone got any ideas?

    thx!

  • #2
    Re: client pulling out of scope i.p.!!

    ok so when you do a ipconfig /renew on the client
    it gets the ip f.e. : 192.168.10.235 ?

    If you do ipconfig /all , is the other information correact ? (DNS, DHCP, Default ...)

    What does it say with node type ?

    Comment


    • #3
      Re: client pulling out of scope i.p.!!

      Check to ensure it doesn't have an alternative configuration (Right click Network adapter then properties on the Internet Protocol)

      Also make sure there isn't a reservation in DHCP.

      If this is still happening then please post a screenshot of your "ipconfig /all" as advised by spoofer.

      Michael
      Attached Files
      Michael Armstrong
      www.m80arm.co.uk
      MCITP: EA, MCTS, MCSE 2003, MCSA 2003: Messaging, CCA, VCP 3.5, 4, 5, VCAP5-DCD, VCAP5-DCA, ITIL, MCP, PGP Certified Technician

      ** Remember to give credit where credit is due and leave reputation points sigpic where appropriate **

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      • #4
        Re: client pulling out of scope i.p.!!

        Check to make sure there isn't more than one DHCP server on your network. Maybe a router or something has the DHCP server enabled.

        Run this tool to help you figure out what DHCP is issusing the IP.

        http://www.networksecurityhome.com/d...cpExplorer.exe
        Andrew

        ** Remember to give credit where credit is due and leave reputation points sigpic where appropriate **

        Comment


        • #5
          Re: client pulling out of scope i.p.!!

          Originally posted by ahinson View Post
          Check to make sure there isn't more than one DHCP server on your network. Maybe a router or something has the DHCP server enabled.

          Run this tool to help you figure out what DHCP is issusing the IP.

          http://www.networksecurityhome.com/d...cpExplorer.exe

          Wouldn't you be able to get that information from running an ipconfig/all?

          Code:
                  ...
                  DHCP Enabled. . . . . . . . . . . : Yes
                  Autoconfiguration Enabled . . . . : Yes
                  IP Address. . . . . . . . . . . . : 172.18.21.153
                  Subnet Mask . . . . . . . . . . . : 255.255.255.0
                  Default Gateway . . . . . . . . . : 172.18.21.65
                  DHCP Server . . . . . . . . . . . : 172.18.21.65
                  DNS Servers . . . . . . . . . . . : 172.18.21.66
          Regards,
          Jeremy

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

          Comment


          • #6
            Re: client pulling out of scope i.p.!!

            thx for the replies everyone. turns out it was a setting in the firewall. weird that it was affecting just the one pc, though. and that it just happened outta nowhere. but again, thx for the replies!

            Comment


            • #7
              Re: client pulling out of scope i.p.!!

              Not always. Yes if it always gets the IP from the same rogue server, no if it randomly bounces around.

              This tool will let you send the request over and over to see if another server is randomly jumping in and giving out IPs.

              Originally posted by JeremyW View Post

              Wouldn't you be able to get that information from running an ipconfig/all?

              Code:
                      ...
                      DHCP Enabled. . . . . . . . . . . : Yes
                      Autoconfiguration Enabled . . . . : Yes
                      IP Address. . . . . . . . . . . . : 172.18.21.153
                      Subnet Mask . . . . . . . . . . . : 255.255.255.0
                      Default Gateway . . . . . . . . . : 172.18.21.65
                      DHCP Server . . . . . . . . . . . : 172.18.21.65
                      DNS Servers . . . . . . . . . . . : 172.18.21.66
              Last edited by ahinson; 11th April 2007, 03:18.
              Andrew

              ** Remember to give credit where credit is due and leave reputation points sigpic where appropriate **

              Comment


              • #8
                Re: client pulling out of scope i.p.!!

                Originally posted by ahinson View Post
                Not always. Yes if it always gets the IP from the same rogue server, no if it randomly bounces around.

                This tool will let you send the request over and over to see if another server is randomly jumping in and giving out IPs.
                Ahh, very nice.
                Regards,
                Jeremy

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

                Comment

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