Sudden wireless network problem

Discussion in 'Home Networking' started by Bobby, Aug 13, 2005.

  1. Bobby

    Bobby Guest

    My home wireless network has worked flawlessly for months but one of my PCs
    suddenly refused to work last night.

    I have a BT Broadband connection (1Mb). This connection works OK since the
    other PCs in my home connect OK (I am typing this from my wireless laptop).

    My hardware is: BT Voyager wireless router/modem. Belkin wireless network
    adapter. All running at 801g (54Mbit). I let my Belkin software manage the
    connection (not Windows). I'm running Windows XP SP2.

    Last night my Internet connection suddently went down. The PC was previously
    working fine (and connecting to the Internet without a problem). The icon in
    the system tray was reporting "limited connectivity" but I had something
    else to do and ignored the problem.

    But this morning the same problem arose. This time I appeared to have full
    (90%) connectivity according to the icon in the system tray. So I expected
    to connect to the Net without problems - but I couldn't (it timed-out).
    Worse, I can't connect to my router's home page. But my PC reports that my
    wireless adaptor is working OK and that I have connectivity (ranging from
    90-95%). But nothing works.

    Sometimes the system tray reports "limited connectivity" but if I disable
    and enable the connection it goes back to (almost) full connectivity. But I
    still can't "see" my wireless router (i.e. it's admin web page).

    I'm at a loss. Help!

    Cheers.

    Bobby
     
    Bobby, Aug 13, 2005
    #1
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  2. Bobby

    Gaz Guest

    newsgroups snipped

    Could be a few things, sounds like your laptop is having diffculty
    communicating with the DHCP server from the router (thats what gives it the
    ip address etc).

    Instead of disabling and enabling your connection, go to run type cmd and
    type ipconfig /release and then ipconfig /renew see if you can
    communicate....

    Also, it might be worth changing the channel that your wireless adapter is
    on, they usually default to 11, try a different number.....

    Also try power cycling your router, most combined routers/dsl/wireless
    devices have a reputation for needing to be rebooting now and then.

    Gaz
     
    Gaz, Aug 13, 2005
    #2
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  3. Firstly try to check your TCP/IP settings. Do you use DHCP ?
    try:
    start/run/cmd
    ipconfig

    If everything looking alright try to check your WEP and SNR.

    If still isn't working I could propose you to check your firewalls,
    antyvir softwere at your PC.


    Best Regards
    Marcin Gaszewski
     
    Marcin Gaszewski, Aug 13, 2005
    #3
  4. How do the other PCs connect? By wireless or by Ethernet cable? If others
    connect by wireless and work OK, the problem is presumably with your laptop.

    If your laptop is the only PC that's connected by wireless, it may be the
    router's wireless adaptor that has got into a strange state: you coudl try
    resetting the router (either from its web interface or by powering it off
    for 30 seconds).
    Check to see if you laptop is being given an IP address by the router's
    DHCP:

    - Start | Run | cmd
    - At the C:> prompt in the black window, type ipconfig /all

    You should see output like this



    Windows IP Configuration


    Host Name . . . . . . . . . . . . : MartinLaptop
    Primary Dns Suffix . . . . . . . :
    Node Type . . . . . . . . . . . . : Unknown
    IP Routing Enabled. . . . . . . . : No
    WINS Proxy Enabled. . . . . . . . : No


    Ethernet adapter Wireless Network Connection:

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : NETGEAR WG111T 108Mbps Wireless
    USB2.0 Adapter
    Physical Address. . . . . . . . . : 00-0F-B5-3C-65-6F
    Dhcp Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    IP Address. . . . . . . . . . . . : 192.168.0.2
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Default Gateway . . . . . . . . . : 192.168.0.1
    DHCP Server . . . . . . . . . . . : 192.168.0.1
    DNS Servers . . . . . . . . . . . : 192.168.0.1
    Lease Obtained. . . . . . . . . . : 13 August 2005 10:12:37
    Lease Expires . . . . . . . . . . : 16 August 2005 10:12:37


    The important thing is that your PC has an IP address 192.168.x.x and that
    its default gateway, DNS and DHCP servers are each the IP address of the
    router. Compare the output of ipconfig /all with that from another PC that
    works (it doesn't matter whether it uses Ethernet or wireless): both should
    have IP addresses in the same range (eg 192.168.0.2 and 192.168.0.3).

    If the router has the ability to display the devices that are connected to
    it, see whether the laptop and its IP are listed.


    Report back the output of ipconfig and I'll see if I can diagnose further.
     
    Martin Underwood, Aug 13, 2005
    #4
  5. Hi Bobby,

    Reset the router first. Shut down the router and broadband modem. Then power
    up the modem and wait until it makes its connection, then power up the
    router. You may also find that you need to restart the systems connected to
    it, but you may get around it by running ipconfig /release, then /renew from
    a cmd prompt.

    --
    Best of Luck,

    Rick Rogers, aka "Nutcase" - Microsoft MVP
    http://mvp.support.microsoft.com/
    Associate Expert - WindowsXP Expert Zone
    www.microsoft.com/windowsxp/expertzone
    Windows help - www.rickrogers.org
     
    Rick \Nutcase\ Rogers, Aug 13, 2005
    #5
  6. there is only one combined modem/router/wireless box.

    Phil
     
    Phil Thompson, Aug 13, 2005
    #6
  7. OK. Power up the combined box and everything within it will start -
    hopefully in the correct order to keep Richard happy!
     
    Martin Underwood, Aug 13, 2005
    #7
  8. Rick \Nutcase\ Rogers, Aug 13, 2005
    #8
  9. Bobby

    Conor Guest

    If you're using MAC address filtering, check that.


    --
    Conor

    If Pac-Man affected us as kids, we'd all be running around in darkened
    rooms, munching magic pills and listening to repetitive electronic
    music.
     
    Conor, Aug 13, 2005
    #9
  10. sure. For info, in the UK separate ethernet ADSL modems are not very
    common, and are usually a nuisance as the default DSL service is PPPoA
    and not PPPoE.

    Cheers,

    Phil
     
    Phil Thompson, Aug 13, 2005
    #10
  11. Bobby

    Brian Guest

    Did you reboot the router?
     
    Brian, Aug 13, 2005
    #11
  12. Bobby

    Kerry Brown Guest

    It may be something simple. Have any neighbours recently added a wireless
    network? Have you installed anything that may be interfering? i.e. cordless
    phone, cheap fan that generates a lot of r/f noise, fluorescent desk lamp.
    etc.

    Kerry
     
    Kerry Brown, Aug 13, 2005
    #12
  13. Bobby

    Joan Archer Guest

    I agree that power cycling clears a lot of problems and also shut down the
    machines until the router is back up and steady then boot up the
    computers.
    With my setup it's a Wireless 4 port router with my machine connected by
    ethernet to the router, XPHomeSP2. The other XPHomeSP2 is connected
    through wireless and I have a WinME machine connecting through wireless.
    I find if I power cycle the router without switching off the machines
    first and get everything working again with regards connecting to the
    internet it plays havoc with shutting the XP's down at the end of the day.
    Joan
     
    Joan Archer, Aug 13, 2005
    #13
  14. Bobby

    Bobby Guest

    Thanks for the suggestions.

    The problem PC is a desktop system (not a laptop).

    The network also includes two laptops (including the one I'm typing this on)
    and another desktop PC. All connect wirelessly. All work perfectly.

    My problem PC was working perfectly. I did not make any network changes. I
    am reluctant to stop messing about with TCP/IP settings.

    My modem and router is a combined unit. I switched it off last night but the
    problem persisted this morning when I tried again. I presume switching it
    off is the same as a reboot. The lights on the modem/router report no
    problems whatsoever and every other PC/laptop works OK.

    I can't connect to my modem/router web management page so something
    fundamental must be going wrong between my PC and the router.

    I am going to try to re-install my wireless network adaptor software. Then I
    will replace my wireless adaptor to see if that helps.

    Bobby
     
    Bobby, Aug 13, 2005
    #14
  15. Bobby

    Tiscali Tim Guest

    In an earlier contribution to this discussion,
    Have you re-booted the problem PC? Does that help?

    If the PC *appears* to be connected to the PC but can't talk to it, some of
    the PCs wireless settings may have got corrupted somehow.

    What level of wireless security are you using - encryption, MAC address
    filtering, hiding SSID, etc.? If using encryption, make sure that the type
    and parameters are set up on the PC exactly as on the router. If using MAC
    address filtering, make sure that the PC's wireless card's MAC address is in
    the router's Permitted table.

    Can you ping the router from the PC?

    You can *check* the PC's TCP/IP settings without having to mess with/change
    them. When you type "ipconfig /all" at the Command prompt, does it display
    an IP address in the same range as that of the router, and with the same
    subnet mask?

    [If you don't know how to interpret what it is telling you, copy the output
    from ipconfig /all and paste it into this thread - preferably with the
    equivalent output from a PC which *does* work].
     
    Tiscali Tim, Aug 13, 2005
    #15
  16. Bobby

    Tiscali Tim Guest

    In an earlier contribution to this discussion,
    Perhaps for the same reason as you call yourself <@> ?
     
    Tiscali Tim, Aug 13, 2005
    #16
  17. Bobby

    Guest Guest

    timothy dear why do you call yourself tiscali timmy when you dont even use
    piscalli :)
     
    Guest, Aug 13, 2005
    #17
  18. Bobby

    Ed. Guest

  19. Bobby

    Sparda Guest

    "ethernet ADSL modems"

    You mean a router? Like the one I have? (I live in England)

    "and are usually a nuisance as the default DSL service is PPPoA and
    not PPPoE."

    You sure about that? My BT connection work with both PPPoE and PPPoA.
     
    Sparda, Aug 14, 2005
    #19
  20. no, I mean an ADSL modem using ethernet to connect to a single device.
    yes I am sure, the default is PPPoA, it is the one BT recommend, they
    also added support for PPPoE which AOL use for one. I don't believe
    all ISPs support PPPoE (it adds overhead and an extra client).

    Phil
     
    Phil Thompson, Aug 14, 2005
    #20
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