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IP confusion - Can this really exist?

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  • IP confusion - Can this really exist?

    I just finished helping someone with the weirdest issue with IP ever. They were unable to hit the intranet, but able to access internet. Checked ipconfig /all and it showed no DHCP enabled and the correct static IP information. Did various trblshtng things and needed another set of eyes. Admin helping checks IP in TCP/IP properties and it shows to be automatically assigned IP address?!?!?!

    How is it possible that ipconfig /all can show static IP information while the TCP/IP properties of the LAN cnxn show it set to DHCP at the same time?

    I fixed the issue with setting the static IP info in the TCP/IP properties. Just blown away by what I saw. Any enlightenment is appreciated.

  • #2
    Re: IP confusion - Can this really exist?

    Does it not have multiple network connections and perhaps you were looking at the worng one?

    Never seen this before

    Michael
    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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    • #3
      Re: IP confusion - Can this really exist?

      If your secret operating system is XP Pro, see if the Alternate Configuration tab in the network adapter IP Protocol Properties page has been populated.
      1 1 was a racehorse.
      2 2 was 1 2.
      1 1 1 1 race 1 day,
      2 2 1 1 2

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      • #4
        Re: IP confusion - Can this really exist?

        I think "big" is correct. If it did not find a DHCP the computer will use the alternate IP, setting it as static
        Best regards,
        Mostafa Itani

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

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        • #5
          Re: IP confusion - Can this really exist?

          What was the address it was given??

          If it was a 169 address then your NIC has not been able to contact a DHCP server thus it assigns an APIPA address.

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          • #6
            Re: IP confusion - Can this really exist?

            Originally posted by wullieb1 View Post
            What was the address it was given??

            If it was a 169 address then your NIC has not been able to contact a DHCP server thus it assigns an APIPA address.
            Can it be APIPA? The OP said that the computer was able to reach the Internet....

            Sorin Solomon


            In order to succeed, your desire for success should be greater than your fear of failure.
            -

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            • #7
              Re: IP confusion - Can this really exist?

              Originally posted by sorinso View Post
              Can it be APIPA? The OP said that the computer was able to reach the Internet....
              Depends though on which internal address space he is using.

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              • #8
                Re: IP confusion - Can this really exist?

                Originally posted by wullieb1 View Post
                Depends though on which internal address space he is using.

                Cool.... That would be interesting

                Sorin Solomon


                In order to succeed, your desire for success should be greater than your fear of failure.
                -

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                • #9
                  Re: IP confusion - Can this really exist?

                  Originally posted by sorinso View Post

                  Cool.... That would be interesting
                  An APIPA address is just really a class b netowk that has been reserved.

                  If the OP has a network in the 169 class b address range and they are connecting out via a natted router then i can see no reason why they couldn't conceivably get to the internet.

                  If i'm wrong then someone will correct me.

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                  • #10
                    Re: IP confusion - Can this really exist?

                    gr8fl1, I've seen this when messing around with properties, switching back and forth, changing just the gateway, or messing with the Alternate Configuration. I can't say I know exactly what did it but I know I've seen it. I "fixed" it the same way you did.

                    BTW - Chris, an Alternate Configuration IP address will show as DHCP enabled when you run ipconfig/all.

                    Wullie, for APIPA there is no gateway configured so routing, and therefore Internet access, would be impossible.
                    Regards,
                    Jeremy

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

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                    • #11
                      Re: IP confusion - Can this really exist?

                      Originally posted by JeremyW View Post
                      Wullie, for APIPA there is no gateway configured so routing, and therefore Internet access, would be impossible.
                      Ahh your right i forgot about that.

                      Wullie the numpty eh!!!!!

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                      • #12
                        Re: IP confusion - Can this really exist?

                        Originally posted by wullieb1 View Post
                        Ahh your right i forgot about that.

                        Wullie the numpty eh!!!!!
                        How many times have I made dumber mistakes than that?!
                        (no, don't go looking, they're too easy to find)
                        Regards,
                        Jeremy

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

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                        • #13
                          Re: IP confusion - Can this really exist?

                          Originally posted by JeremyW View Post
                          How many times have I made dumber mistakes than that?!
                          (no, don't go looking, they're too easy to find)


                          Don't know, maybe they aren't that easy to find...
                          My search :http://www.google.com/search?q=jerem...mb+mistakes%22 did not give any results

                          Sorin Solomon


                          In order to succeed, your desire for success should be greater than your fear of failure.
                          -

                          Comment


                          • #14
                            Re: IP confusion - Can this really exist?


                            Well someone is out to get me http://www.pakin.org/complaint?title...pe=f&pgraphs=3
                            Regards,
                            Jeremy

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

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                            • #15
                              Re: IP confusion - Can this really exist?

                              Originally posted by JeremyW View Post
                              How many times have I made dumber mistakes than that?!
                              Hey, can you leave me out of this discussion
                              Marcel
                              Technical Consultant
                              Netherlands
                              http://www.phetios.com
                              http://blog.nessus.nl

                              MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
                              "No matter how secure, there is always the human factor."

                              "Enjoy life today, tomorrow may never come."
                              "If you're going through hell, keep going. ~Winston Churchill"

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