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  1. #1
    New Lounger
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    Lost IP Address (XP 2002 SP2)

    I have a home network that uses a DSL modem/router (one unit). Several days ago, my main computer lost it's network connection and I haven't been able to figure out how to repair it. The other computers work fine on the network, so I suspect it is a problem with the main computer, not the DSL router.

    I have tried to reconfigure the network connection, but can't get anything to work. When I issue the IPCONFIG command, it gives me an unrecognized IP address, and certainly something quite different than the 192.168.0.x address which the router customarily issues. If I issue IPCONFIG /RELEASE, or IPCONFIG /RENEW, the machine just hangs.

    I think this problem may have shown up after I installed Windows updates, but can't remember for sure.

    I have run my anti-virus software several times, and it doesn't find any corrupted files.

    I have considered attempting to reinstall Windows, but am concerned that I may just run into more problems if I try that.

  2. #2
    Uranium Lounger
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    Re: Lost IP Address (XP 2002 SP2)

    If you suspect it occured when you installed some Windows Updates, before you reinstall Windows <img src=/S/yikes.gif border=0 alt=yikes width=15 height=15> try doing a System Restore back to before you installed the updates. If that fixes it, then download and install the updates one by one until the problem reappears and then you will have a better idea of what you need to do. Either skip that update or do a google search to see if there are any issues with the modem/router and that update or contact the vendor of the modem and see what they have to say.
    <IMG SRC=http://www.wopr.com/w3tuserpics/DocWatson_sig.gif>

  3. #3
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    Re: Lost IP Address (XP 2002 SP2)

    <P ID="edit" class=small>(Edited by skitterbug on 15-Nov-06 19:02. Oops - bad me!)</P>Is the network card in your PC still functioning properly? What happens if you ping 127.0.0.1?

    PS: I am sorry, I forgot my manners! Welcome to the Lounge! <img src=/S/grin.gif border=0 alt=grin width=15 height=15>


    "Peace begins with a smile. "-- Mother Teresa

  4. #4
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    Re: Lost IP Address (XP 2002 SP2)

    The ping 127.0.0.1 works fine--no errors.

  5. #5
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    Re: Lost IP Address (XP 2002 SP2)

    Tried restoring from several restore points dating back about a month (which I'm sure was earlier than the problem existed). None of these restores cured the problem.

  6. #6
    Plutonium Lounger
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    Re: Lost IP Address (XP 2002 SP2)

    Bob,

    Can you be more explicit than "Lost its network connection".

    Can you try to run the Windows Network diagnostics to see exactly what works and what is broken, from a command prompt type NETSH DIAG GUI, when the network diagnostic window opens click on Scan your system. Then use the + signs on the left to expand the various sections and let us know what works and what fails.

    StuartR

  7. #7
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    Re: Lost IP Address (XP 2002 SP2)

    Hi Bob,

    I am a hardware nut so that's why I started with the NIC card. Since you've tried restoring to earlier times and that didn't work as DocWatson suggested, maybe another thing you could try is this Star <post:=589,883>post 589,883</post:> just to be sure nothing has changed in your initial settings? I can't imagine an update from MS could have messed up anything but strange things happen. <img src=/S/yep.gif border=0 alt=yep width=15 height=15> I can only say that my PC is fully updated, runs through a router into a cable modem and it is humming right along. Oh - one other thing I thought about, could the port, that you have your PC plug into, become "wonky"? Sometimes, on our switches (in a school setting), we'd find a port misbehaving or totally shot so we'd move our RJ45s into another slot and all would be well again. Eventually, we would replace the switch! <img src=/S/yep.gif border=0 alt=yep width=15 height=15> Just a thought..... Frustrating not knowing the cause - good luck and maybe someone else will have better suggestions! <img src=/S/smile.gif border=0 alt=smile width=15 height=15>


    "Peace begins with a smile. "-- Mother Teresa

  8. #8
    Plutonium Lounger
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    Re: Lost IP Address (XP 2002 SP2)

    I didn't read your original post carefully enough.

    > When I issue the IPCONFIG command, it gives me an unrecognized IP address, and certainly
    > something quite different than the 192.168.0.x address which the router customarily issues.

    Does this address start with 169.

    If so then this is from Microsoft's Automatic IP Address pool, it is used by PCs to enable them to talk to each other if you configure a small network with no DHCP server, and usually means that the DHCP server isn't working, or the PC can't talk to the DHCP Server.

    The first things to try are
    <UL><LI>Check if the lights are on at both ends of the cable connecting you to the DHCP Server.
    <LI>Try rebooting the DSL Modem/Router, sometimes the DHCP servers in these can get in a state where they won't issue new addresses.
    <LI>Try connecting the PC to a known working ethernet cable plugged into a known working port on the router.[/list]StuartR

  9. #9
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    Re: Lost IP Address (XP 2002 SP2)

    Followed your suggestion with the NETSH command. What it gave me was:

    Default Outlook Express Mail mail.pngusa.net/mail.pngusa.net failed
    Ping request could not find host mail.pngusa.net. .....

    Under Modems and Netowrk Adapters, it showed the Network Adapters Passed.

    Note: the pngusa.net is the URL for a dial-up service I use as a backup to my DSL connection, so I'm not sure what the significance of those "failed" messages is.

    By "Lost its network connection", I mean that this computer is unable to access the Internet through the DSL modem/router. It is also unable to see other computers on the network and they are unable to see this (what I referred to as the "Main") computer. I am unable to reset the IP address (using the IPCONFIG command) as described earlier.

  10. #10
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    Re: Lost IP Address (XP 2002 SP2)

    The IP address it comes up with is: 169.254.143.187. If I ping that address, it works fine--no errors.

    I have turned off the modem/router several times to reset it--the problem still persists. I have checked the cable, and have unplugged it from the router. When I unplug the cable, the Internet port light on the router goes dark; when I plug the cable back in, the light comes back on. Tried a different router port also--still doesn't work.

    I have checked the modem/router by using the URL 192.168.0.1 from another computer, and the router settings all appear to be okay. But then, other computers are working properly through the modem/router.

  11. #11
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    Re: Lost IP Address (XP 2002 SP2)

    > other computers are working properly through the modem/router

    Can you check that the other computers are able to use the DHCP server - it is possible that they are only working because they already have IP addresses. Just try IPCONFIG / RELEASE followed by IPCONFIG / RENEW.

    StuartR

  12. #12
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    Re: Lost IP Address (XP 2002 SP2)

    I tried that to verify that I didn't have a problem with the router.

    I went and "forced" an IP address in the TCP/IP properties, and gave it a default IP address as well. That didn't solve anything--the machine just "hunted" for the network. So I disabled the network connection completely. Then later I went back and reset the "Obtain an IP address automatically", and re-enabled the network connection. At that point everything came alive and worked properly.

    I would like to be able to understand what went on here, and why that action cured the problem, but may never know.

    Thanks again for all your help.
    Bob

  13. #13
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    Re: Lost IP Address (XP 2002 SP2)

    At least you got it working.

    I have one laptop that sometimes has a problem after I make network changes, I have to disable and then re-enable it's Ethernet port before it will talk to the DHCP server.

    StuartR

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