WRT45G can't manage 2 computers after brief power outage

Discussion in 'Cisco/Linksys Wireless Routers' started by Coolforumname, Jul 20, 2007.

  1. Coolforumname

    Coolforumname LI Guru Member

    A week or two ago the breaker was accidently flipped off and on for my computer room. My connection to the internet was interupted so I unplugged/plugged back in the router. This restored my connection for my desktop and everything seemed OK until I turned on my laptop on. At that point my laptop registered as being connected wirelessly but it seemed to create a conflict with the desktop and neither could connect to the internet.

    Basically, the connection works fine if only one computer is on (either desktop or laptop) but when both computers on neither works. :frown:

    Have I fried my router? Is there anything that I can do to diagnose the issue?
  2. ifican

    ifican Network Guru Member

    Sounds like in IP conflict, make sure both are setup for dhcp, what ip is each host getting?
  3. t4thfavor

    t4thfavor Network Guru Member

    I second the IP conflict. Is it possible that the wrt stopped giving out dhcp, or that you have 2 statics set to the same thing?
  4. HennieM

    HennieM Network Guru Member

    Agree with IP conflict. If both computers are set up for DHCP, and they still get the same IP address, it could be that OS software has somehow changed a MAC address of one of the NICs. Had this happen with WinXP and an IBM T41 once, where it seemed to adopt another MAC address.
  5. Coolforumname

    Coolforumname LI Guru Member

    OK, the router (which is connected by wire to the desktop) is set-up for automatic dhcp and the laptop wireless tcp/ip is set-up to obtain the IP address automatically. The laptop says the address type is assigned by DHCP and the IP address is the

    What happens is whichever computer I turn on first gets an IP address and it connects to the 'net OK, the other computer can't obtain and IP address at all. It just says the address type is "Invalid IP address" under the local area network status and the IP adress is all zeros.


    (thanks for taking the time to offer some advice btw)
  6. Coolforumname

    Coolforumname LI Guru Member

    Oh - and I verified that the MAC addresses are different and are as they were when I first set this stuff up.
  7. Coolforumname

    Coolforumname LI Guru Member


    I just figured it out. The laptop has an automatic assignment, but the desktop doesn't (which I didn't set - or check. I thought that it would have the IP address of the router - my understanding of these things is very weak.) So anyway, at some point somebody set it to be static and be the first IP address allocated by the dhcp. So there you have it.

    All is happy now.

    I don't know what the power outage had to do with it though.

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