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Sister-in-law's laptop kills the network

Discussion in 'Networking' started by paweiss, Jan 1, 2011.

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  1. paweiss

    paweiss Thread Starter

    Joined:
    Jan 1, 2011
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    Hi - The sister-in-law came for the holidays, and when she tries to hook in to our network, the whole thing goes down. Unplugging her computer doesn't help; rebooting the router & cable modem (with her disconnected) gets everyone running again, except her. I've got to get her off my computer! Which will only happen when she gets hers to work on our network.

    So: our network has never had a problem with any other computer like this. Likewise, she swears she's never had a problem connecting to (or killing) another network besides ours. I'm running a Linksys cable modem, then a D-Link WBR-1310 wireless router. Further downstream, there's a switch or two. The behavior is the same whether she tries to connect via WiFi or cat5. She's running Win7; I think most of our other computers are Vista & XP.

    Any advice on where to start?

    Thanks,
    Philip
     
  2. TerryNet

    TerryNet Moderator

    Joined:
    Mar 23, 2005
    Messages:
    77,173
    First Name:
    Terry
    Please show the following
    a. for a Windows system when the network is OK;
    b. for the same Windows system when the network has been killed;
    c. for the dreaded "killer" system (connected).

    Start, Run, CMD, OK to open a command prompt:
    (For Vista or 7 type CMD in the Search box after Start)

    Type the following command:

    IPCONFIG /ALL

    [Note that there is no space between the slash and ALL.]

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

    If necessary use a text file and removable media to copy the results to a computer with internet access.
     
  3. paweiss

    paweiss Thread Starter

    Joined:
    Jan 1, 2011
    Messages:
    5
    Thanks for the reply! Here are the 3 ipconfigs:

    1) My computer before SIL tries to connect.

    Microsoft Windows [Version 6.0.6002]
    Copyright (c) 2006 Microsoft Corporation. All rights reserved.

    C:\Users\Philip>ipconfig /all

    Windows IP Configuration

    Host Name . . . . . . . . . . . . : kitsch
    Primary Dns Suffix . . . . . . . :
    Node Type . . . . . . . . . . . . : Hybrid
    IP Routing Enabled. . . . . . . . : No
    WINS Proxy Enabled. . . . . . . . : No
    DNS Suffix Search List. . . . . . : cable.rcn.com

    Ethernet adapter Bluetooth Network Connection:

    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)
    Physical Address. . . . . . . . . : 00-19-7E-DE-8F-25
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes

    Ethernet adapter Local Area Connection:

    Connection-specific DNS Suffix . : cable.rcn.com
    Description . . . . . . . . . . . : Intel(R) 82562V-2 10/100 Network Connecti
    on
    Physical Address. . . . . . . . . : 00-1D-09-79-20-78
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    Link-local IPv6 Address . . . . . : fe80::b917:2ee9:bf3:e033%9(Preferred)
    IPv4 Address. . . . . . . . . . . : 192.168.0.102(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Lease Obtained. . . . . . . . . . : Saturday, January 01, 2011 7:49:54 PM
    Lease Expires . . . . . . . . . . : Sunday, January 02, 2011 3:19:54 PM
    Default Gateway . . . . . . . . . : 192.168.0.1
    DHCP Server . . . . . . . . . . . : 192.168.0.1
    DHCPv6 IAID . . . . . . . . . . . : 201334025
    DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-0E-F4-55-5E-00-1D-09-79-20-78

    DNS Servers . . . . . . . . . . . : 192.168.0.1
    NetBIOS over Tcpip. . . . . . . . : Enabled

    Tunnel adapter Local Area Connection* 6:

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
    Physical Address. . . . . . . . . : 02-00-54-55-4E-01
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes
    IPv6 Address. . . . . . . . . . . : 2001:0:4137:9e76:281e:250f:3f57:ff99(Pref
    erred)
    Link-local IPv6 Address . . . . . : fe80::281e:250f:3f57:ff99%8(Preferred)
    Default Gateway . . . . . . . . . : ::
    NetBIOS over Tcpip. . . . . . . . : Disabled

    Tunnel adapter Local Area Connection* 7:

    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . : cable.rcn.com
    Description . . . . . . . . . . . : Microsoft ISATAP Adapter
    Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes

    Tunnel adapter Local Area Connection* 13:

    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : isatap.{9A0EFC38-225C-4534-B107-884E791C2
    139}
    Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes

    C:\Users\Philip>

    2) My computer AFTER SIL tries to connect.

    Microsoft Windows [Version 6.0.6002]
    Copyright (c) 2006 Microsoft Corporation. All rights reserved.

    C:\Users\Philip>ipconfig /all

    Windows IP Configuration

    Host Name . . . . . . . . . . . . : kitsch
    Primary Dns Suffix . . . . . . . :
    Node Type . . . . . . . . . . . . : Hybrid
    IP Routing Enabled. . . . . . . . : No
    WINS Proxy Enabled. . . . . . . . : No
    DNS Suffix Search List. . . . . . : cable.rcn.com

    Ethernet adapter Bluetooth Network Connection:

    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)
    Physical Address. . . . . . . . . : 00-19-7E-DE-8F-25
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes

    Ethernet adapter Local Area Connection:

    Connection-specific DNS Suffix . : cable.rcn.com
    Description . . . . . . . . . . . : Intel(R) 82562V-2 10/100 Network Connecti
    on
    Physical Address. . . . . . . . . : 00-1D-09-79-20-78
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    Link-local IPv6 Address . . . . . : fe80::b917:2ee9:bf3:e033%9(Preferred)
    IPv4 Address. . . . . . . . . . . : 192.168.0.102(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Lease Obtained. . . . . . . . . . : Saturday, January 01, 2011 7:49:54 PM
    Lease Expires . . . . . . . . . . : Sunday, January 02, 2011 3:19:54 PM
    Default Gateway . . . . . . . . . : 192.168.0.1
    DHCP Server . . . . . . . . . . . : 192.168.0.1
    DHCPv6 IAID . . . . . . . . . . . : 201334025
    DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-0E-F4-55-5E-00-1D-09-79-20-78

    DNS Servers . . . . . . . . . . . : 192.168.0.1
    NetBIOS over Tcpip. . . . . . . . : Enabled

    Tunnel adapter Local Area Connection* 6:

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
    Physical Address. . . . . . . . . : 02-00-54-55-4E-01
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes
    IPv6 Address. . . . . . . . . . . : 2001:0:4137:9e76:2032:3958:3f57:ff99(Pref
    erred)
    Link-local IPv6 Address . . . . . : fe80::2032:3958:3f57:ff99%8(Preferred)
    Default Gateway . . . . . . . . . : ::
    NetBIOS over Tcpip. . . . . . . . : Disabled

    Tunnel adapter Local Area Connection* 7:

    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . : cable.rcn.com
    Description . . . . . . . . . . . : Microsoft ISATAP Adapter
    Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes

    Tunnel adapter Local Area Connection* 13:

    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : isatap.{9A0EFC38-225C-4534-B107-884E791C2
    139}
    Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes

    C:\Users\Philip>
    3) SIL's computer after it tries to connect.

    Microsoft Windows [Version 6.1.7600]
    Copyright (c) 2009 Microsoft Corporation. All rights reserved.
    C:\Users\cat>ipconfig /all
    Windows IP Configuration
    Host Name . . . . . . . . . . . . : cat-PC-emew
    Primary Dns Suffix . . . . . . . :
    Node Type . . . . . . . . . . . . : Broadcast
    IP Routing Enabled. . . . . . . . : No
    WINS Proxy Enabled. . . . . . . . : No
    Ethernet adapter Local Area Connection:
    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . : cable.rcn.com
    Description . . . . . . . . . . . : Broadcom NetLink (TM) Gigabit Ethernet
    Physical Address. . . . . . . . . : 00-26-9E-3A-22-7D
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    Ethernet adapter Bluetooth Network Connection:
    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)
    Physical Address. . . . . . . . . : 0C-60-76-A1-CE-A0
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    Wireless LAN adapter Wireless Network Connection:
    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . : cable.rcn.com
    Description . . . . . . . . . . . : Intel(R) WiFi Link 5100 AGN
    Physical Address. . . . . . . . . : 00-22-FB-A9-DB-6A
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    Tunnel adapter isatap.cable.rcn.com:
    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Microsoft ISATAP Adapter
    Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes
    Tunnel adapter Teredo Tunneling Pseudo-Interface:
    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
    Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes
    Tunnel adapter isatap.{6E1BBE01-2A0B-4947-85D0-BE7837C93ADF}:
    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
    Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes
    C:\Users\cat>

    Thanks again for the help.

    - Philip
     
  4. TerryNet

    TerryNet Moderator

    Joined:
    Mar 23, 2005
    Messages:
    77,173
    First Name:
    Terry
    The kitsch computer still has its same IP configuration. So, what do you mean by "the whole thing goes down"? Can you still ping the router? If so, can you access its configuration pages? If so, can you ping an internet address (e.g., 8.8.4.4)?

    It appears that the cat-PC-emew computer didn't actually succeed in connecting, as both ethernet and wireless show "Media disconnected." At that time was it trying to connect by ethernet or wireless or both? Were there any error messages?
     
  5. paweiss

    paweiss Thread Starter

    Joined:
    Jan 1, 2011
    Messages:
    5
    Thanks for the help. By "the whole thing goes down", I meant that everyone on the network seems to lose connectivity, at least to the things they were trying to do, i.e. mostly internet access. Not only does SIL not successfully connect (cat-PC-emew), but the other computers that were working fine (kitsch etc) lose internet, and in fact, the router no longer broadcasts its SSID.

    When cat-PC-emew first tries to connect to the network, it does seem to connect for a moment, at least it doesn't get an error, and seems happy for at least a few seconds, although I wasn't able to get a web page to load. In the instance where I got the ipconfigs, I was having her connect wirelessly, although the symptoms and outcome were the same when I did it via ethernet. As for error messages, I don't recall anything particular; as I said, it seemed initially to seem to connect successfully, momentarily, and then it would be non connected, so probably gave some message like "a network cable has been unplugged", or whatever it says when losing a wireless connection.

    I'll have to wait for some people to stop using the connection to see exactly whether there were error messages, and to see if I could still access the router & config pages. I'll try to do that shortly.

    Thanks,
    Philip
     
  6. paweiss

    paweiss Thread Starter

    Joined:
    Jan 1, 2011
    Messages:
    5
    OK, I've poked at it a bunch now. This is quite odd. It behaves differently the first vs. the second time I try to connect the Sister-in-Law's computer (cat-PC-emew).

    The first time I try to have her connect to the router (wirelessly), it tries, seems to succeed for a few seconds, although I can't ping anything from her computer. Watching the DHCP client list from another computer (kitsch), I do see her getting an IP address. Then, after a few seconds, the network goes down, the SSID is not being broadcast, and I can't see the router config page. After maybe 20-30 seconds more, the network comes back up, I can see the config page, her computer is no longer on the DHCP client list, and the SSID is being broadcast. We're now back to normal, other than her computer not being on the network.

    If I then try again to connect her computer, it again knocks out the network, just like the first time, but this time, it does not come back on it's own. I can't ping anything, I can't access the router config pages, I have to go downstairs and power cycle the router.

    I've done this two-step 3 or 4 times now, same each time.

    Thanks,
    Philip
     
  7. TerryNet

    TerryNet Moderator

    Joined:
    Mar 23, 2005
    Messages:
    77,173
    First Name:
    Terry
    Don't know if this will give you a warm fuzzy feeling, but I've never seen one quite like this.

    Sounding like it's a wireless issue. To make sure, try switching the wireless off on that PC and see if you can connect it by ethernet. If this also fails then I'll have to rethink.

    If the above does show that it is a wireless issue delete all the wireless profiles on the PC. Install the latest wireless driver from the PC manufacturer's web site. Please do the install even if the driver is already up to date because the currently installed version may be slightly (not so slight for your network) corrupted. Cross you fingers, hold your breath, switch the wireless on and try again.

    The following could be tried no matter what, and I want you to do them if any of the above fails.

    (From a JohnWill post)

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

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

    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.
     
  8. paweiss

    paweiss Thread Starter

    Joined:
    Jan 1, 2011
    Messages:
    5
    I guess I'll take the warm fuzzys, since that's all I've got for now.

    Not a wireless issue. Turned of the wireless; same problem with ethernet, down to the two step kill! First try, kills the network; pull the cable, and the network comes back up after 30 sec or so. Try again, kills the network dead; have to go downstairs and power cycle the router.

    Tried the TCP/IP stack repair.

    Step 1 response: "Sucessfully reset the Winsock Catalog"
    Step 2: "Reseting Interface, OK!"
    Step 3: "There's no user specified settings to be reset"

    So, now what? What my electrician used to call the 'fine adjustment tool', AKA hammer?
     
  9. TerryNet

    TerryNet Moderator

    Joined:
    Mar 23, 2005
    Messages:
    77,173
    First Name:
    Terry
    An electrical problem (even w/o a hammer) could explain the ethernet issue (computer not grounded properly perhaps) but that wouldn't explain the Wi-Fi issue.

    You could try Safe Mode with Networking. If the problem doesn't appear then it must be some program or service that runs in normal mode.

    I suppose another thing is some type of sniffer program (Wireshark?) to determine if some "killer" signal is being sent. Use of such a program or analysis of the results is beyond my experience.

    The only thing even close to this I've "seen" in threads here have been Vista systems when connected by wireless to certain Linksys routers to cause the network to "go crazy" in various ways. The only solutions to any of those threads was a different router. With routers being cheaper than computers that may be your most practical solution.
     
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