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Solved: Computer does not recognize LAN

Discussion in 'Networking' started by galaxianomiko, Sep 28, 2009.

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  1. galaxianomiko

    galaxianomiko Thread Starter

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    Having a bit of trouble with one of the computers at my house. All of a sudden, after working just fine earlier in the day, it is not recognizing the cable internet connection. None of the usual easy fixes are working (restarting the router/computer, checking for a dead cable/port, etc.) I'm hoping someone can point me in the right direction!

    I have a Belkin N wireless router with four computers hooked up to it (one through wireless, three through ethernet cables.) The computer that is not connecting uses a cable and is running on Windows Vista. None of the other computers are having any problems.

    When I look at the network icon it tells me it has only local access through an unidentified network. Normally, this would show Belkin N wireless as the connection. This unidentified network is listed as "Broadband Connection: WAN Miniport PPPOE." I have never seen this listed here before. If I try to connect to it, it asks for a username and password.

    When I look under "Network Connections," it lists the Broadband connection as disconnected and the LAN connection as unidentified. When looking at the ipconfig settings, I'm getting normal settings except for the autoconfiguration IPv4 address (instead it's the 169.254... that means I'm not getting an IP.) It also leaves the Connection-Specific DNS Suffix blank.

    I've double-checked all of the Properties settings for the LAN connection with what's listed on my ISP's website, and it all looks to be in order. Additionally, I cannot even try to reset the connection or update the drivers through the CD, because the first thing it does is try to find the router, and it can't.

    I have no idea what else to try next. The only change that has happened to this computer recently has been downloading a codec to view RAW photo files, and I can't imagine that had anything to do with this, as the problem occurred much later. Any suggestions would be greatly appreciated.
     
  2. JohnWill

    JohnWill Retired Moderator

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    First off, try booting in Safe Mode with Networking and see if you can connect that way.

    If not, the next step would be to try this stack reset and see if that resolves the issue.

    TCP/IP stack repair options for use with Vista or Windows 7.

    Start, All Programs\Accessories and right click on Command Prompt, select "Run as Administrator" to open a command prompt.

    In the command prompt window that opens, type type the following commands, each followed by the Enter key:

    Reset WINSOCK entries to installation defaults: netsh winsock reset catalog

    Reset IPv4 TCP/IP stack to installation defaults. netsh int ipv4 reset reset.log

    Reset IPv6 TCP/IP stack to installation defaults. netsh int ipv6 reset reset.log

    Reboot the machine.
     
  3. galaxianomiko

    galaxianomiko Thread Starter

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    Hi JohnWill, and thanks for your reply.

    I still could not connect in safe mode, and the stack reset also made no change.

    Though, now when I click "diagnose why Windows cannot find additional networks", I am getting a message that tells me I do not have a wireless network adapter installed. I hope that's just referring to the fact that this computer has no wireless card.
     
  4. JohnWill

    JohnWill Retired Moderator

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    Hold the Windows key and press R, then type devmgmt.msc

    Please respond to all the following steps.

    1. Under Network adapters, please tell me all the devices listed.
    2. Are there any devices under Network adapters that have a red x displayed?
    3. Also, are there any devices anywhere in the Device Manager display with yellow ? or ! displayed?
     
  5. galaxianomiko

    galaxianomiko Thread Starter

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    1) There is only one device listed under Network Adapters: SiS191 Ethernet Controller

    2) No devices listed with a red X.

    3) No devices with a yellow ! or ? anywhere in the Device Manager.
     
  6. JohnWill

    JohnWill Retired Moderator

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    Well, you don't have any wireless capability in that machine, so there's no hope of it connecting to a wireless network.

    Since you're connecting with a cable, that shouldn't be an issue.

    Let's see this.

    Hold the Windows key and press R, then type CMD to open a command prompt:

    In the command prompt window that opens, type type the following command:

    Note that there is a space before the /ALL, but there is NOT a space after the / in the following command.

    IPCONFIG /ALL

    Right click in the command window and choose Select All, then hit Enter to copy the contents to the clipboard.
    Paste the results in a message here.

    If you are on a machine with no network connection, use a floppy, USB disk, or a CD-RW disk to transfer a text file with the information to allow pasting it here.
     
  7. galaxianomiko

    galaxianomiko Thread Starter

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    Here you are:

    Windows IP Configuration

    Host Name . . . . . . . . . . . . : Larry-PC
    Primary Dns Suffix . . . . . . . :
    Node Type . . . . . . . . . . . . : Hybrid
    IP Routing Enabled. . . . . . . . : No
    WINS Proxy Enabled. . . . . . . . : No

    Ethernet adapter Local Area Connection:

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : SiS191 Ethernet Controller
    Physical Address. . . . . . . . . : 00-1C-25-82-CF-17
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    Link-local IPv6 Address . . . . . : fe80::fc3e:81b8:13f2:3fcd%8(Preferred)
    Autoconfiguration IPv4 Address. . : 169.254.63.205(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.0.0
    Default Gateway . . . . . . . . . : 0.0.0.0
    DHCPv6 IAID . . . . . . . . . . . : 134218092
    DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
    fec0:0:0:ffff::2%1
    fec0:0:0:ffff::3%1
    NetBIOS over Tcpip. . . . . . . . : Enabled

    Tunnel adapter Local Area Connection* 6:

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : isatap.{AE688BBD-6991-4C08-8412-D09CE60F4
    D74}
    Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes
    Link-local IPv6 Address . . . . . : fe80::5efe:169.254.63.205%10(Preferred)
    Default Gateway . . . . . . . . . :
    DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
    fec0:0:0:ffff::2%1
    fec0:0:0:ffff::3%1
    NetBIOS over Tcpip. . . . . . . . : Disabled

    Tunnel adapter Local Area Connection* 7:

    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
    Physical Address. . . . . . . . . : 02-00-54-55-4E-01
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes

    Hope that gives you some more information.
     
  8. TerryNet

    TerryNet Terry Moderator

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    Strange to get something for Gateway along with a APIPA (169.254.x.y). Maybe some corruption.

    Make sure you have the latest ethernet driver from your PC (or motherboard) manufacturer's web site. If you already have the latest driver use Device Manager to uninstall it; reboot and let Windows discover the adapter and reinstall the driver.

    If still no go try the post # 2 repairs again.

    If still no go please show another ipconfig /all.
     
  9. galaxianomiko

    galaxianomiko Thread Starter

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    Hi, TerryNet. I tried to update the LAN driver, but a window popped up saying that I was already using the best possible driver. So I uninstalled the driver like you said, but could not reboot at this stage because the computer automatically reinstalls the driver every time I try to uninstall it. So I rebooted anyway and went on to try the repairs in the second post again.

    This time, when I did the stack reset commands, I got this message for the IPv4 and IPv6 resets: "Reseting Echo Request Failed. There is no user speficied settings to be reset."

    Here is what the ipconfig settings say now:

    Windows IP Configuration

    Host Name . . . . . . . . . . . . : Larry-PC
    Primary Dns Suffix . . . . . . . :
    Node Type . . . . . . . . . . . . : Hybrid
    IP Routing Enabled. . . . . . . . : No
    WINS Proxy Enabled. . . . . . . . : No

    Ethernet adapter Local Area Connection 2:

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : SiS191 Ethernet Controller
    Physical Address. . . . . . . . . : 00-1C-25-82-CF-17
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    Link-local IPv6 Address . . . . . : fe80::9137:7720:5f29:21cd%9(Preferred)
    Autoconfiguration IPv4 Address. . : 169.254.33.205(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.0.0
    Default Gateway . . . . . . . . . : 0.0.0.0
    DHCPv6 IAID . . . . . . . . . . . : 167779365
    DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
    fec0:0:0:ffff::2%1
    fec0:0:0:ffff::3%1
    NetBIOS over Tcpip. . . . . . . . : Enabled

    Tunnel adapter Local Area Connection* 6:

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : isatap.{962C9298-1BB2-4FAC-8D29-5259D3AE9
    A83}
    Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes
    Link-local IPv6 Address . . . . . : fe80::5efe:169.254.33.205%10(Preferred)
    Default Gateway . . . . . . . . . :
    DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
    fec0:0:0:ffff::2%1
    fec0:0:0:ffff::3%1
    NetBIOS over Tcpip. . . . . . . . : Disabled

    Tunnel adapter Local Area Connection* 7:

    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
    Physical Address. . . . . . . . . : 02-00-54-55-4E-01
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes

    I can't see a difference, though.
     
  10. TerryNet

    TerryNet Terry Moderator

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    I don't see a difference either. :(

    You said you checked for a defective cable or router LAN port, so all I can think of is a possibly corrupted non-Windows firewall or security suite (uninstall it if you have one) or a defective NIC.
     
  11. galaxianomiko

    galaxianomiko Thread Starter

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    I uninstalled McAfee to see if the firewall was causing problems, but still no change. Thanks anyway, Terry. Looks like this is the kind of unfortunate mess I'll have to hire someone to evaluate in person. Totally perplexing! I really appreciate you and JohnWill taking the time to walk me through all these repairs, though.
     
  12. galaxianomiko

    galaxianomiko Thread Starter

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    I've got a positive update on this one: turns out it must have been the NIC. I replaced it with a new card, and almost immediately it connected to the Internet. :) I'm thrilled.

    It's doing one weird thing, though. It's not calling the network Belkin N Wireless--instead it just says "Network 4." I also don't get this "Network 4" listing at all in the Network Sharing Center. Do I need to run the CD that came with the router, or change some settings? I just want to make sure this is running correctly.
     
  13. JohnWill

    JohnWill Retired Moderator

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    The sequential numbering of the network connections is normal, nothing to be concerned about.
     
  14. galaxianomiko

    galaxianomiko Thread Starter

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    Thanks JohnWill. :) So glad to have this solved.
     
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