Network connection

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I am having issue with a network connection. It happen recently that Computer B stop having internet in Room B. I thought it was computer or ethernet cable. I brought Computer A from other room and it works. I thought may be the card failed in Computer B but it works in Room A. Computer A works so it is not Ethernet cable. Computer B works in Room A so it is not network card.

Here is the setup:

Room A has router and 2 ports. Computer A with Windows 7 and Computer B with Windows 8 work on both ports.

Room B has ethernet cable  about 160’+- that goes to Room A thru three walls. Computer A works. Computer B does not work and tried moving cable to other port and still not working.

What could be the problem? Why would one computer work on same cable but other does not?

I do not want to pull the wire out the walls if it works but I do not want to use Windows 8 in Room B. Room A is the main room and main computer used is Windows 7.

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Does Computer B work In Room B if Computer A is not attached at all?

May the Forces of good computing be with you!

RG

PowerShell & VBA Rule!
Computer Specs

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RetiredGeek wrote:

Does Computer B work In Room B if Computer A is not attached at all?

Nope. I move Computer A to Room B. Nothing is currently connect at Room A. Room B has 1 cable so only one can be connect at a time. Computer A works in Room B. But when disconnect the cable and move to Computer B, it can not connect. Even thought it was working a few seconds ago. Move it back and it works on Computer A. But does not work on Computer B. I tried to flushdns and release and renew.

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Is it possible that Computer A is also connected to the internet via a wireless connection?

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Although the network card is not fully dead on the computer that is not working, a desktop network card can be very cheap and replacing that is the first thing I would try.

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Or grab a USB based ethernet jack and see if that works.

Susan Bradley Patch Lady/Prudent patcher

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There’s some very complicated software inside the router that controls the IP addresses assigned to devices connected to it based on the device’s specific MAC address (which is different for every device) and exactly which port that device is plugged into.

The IP address assigned to each device by the router timeout at regular internals (the default for most routers is 300 sec) and must be “renewed” or the device will lose it’s connection to the router.

The release/renew command you entered from computer B attempts to force the router to do this but, since that didn’t work, it’s possible the problem may be in the “router” instead of the NIC in computer B.

I’d suggest powering the Router completely off, wait ~30 seconds, then power it back on and see if that resolves your issue.

If it doesn’t, with computer B plugged into the cable in room B, open a cmd prompt, enter ipconfig, and post the results here to help us determine if the NIC in computer B is even communicating with the router.

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anonymous wrote:

Is it possible that Computer A is also connected to the internet via a wireless connection?

Nope. These are towers. No wifi cards.

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idleinc wrote:

Although the network card is not fully dead on the computer that is not working, a desktop network card can be very cheap and replacing that is the first thing I would try.

You think it might be the card is partial dead. It would be strange that Computer B works in Room A but not Room B. I will think about it and add it to list of things to try.

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Susan Bradley wrote:

Or grab a USB based ethernet jack and see if that works.

Will add this to the list as well.

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n0ads wrote:

I’d suggest powering the Router completely off, wait ~30 seconds, then power it back on and see if that resolves your issue. If it doesn’t, with computer B plugged into the cable in room B, open a cmd prompt, enter ipconfig, and post the results here to help us determine if the NIC in computer B is even communicating with the router.

I did power off 6 times with 5 min interval. It does not see the router. But if I move it Room A it sees the router.  A poster above mentioned that it might be partial dead but it is strange that it works in Room A.

 

Here is the result for Computer B from Room B:

<li style=”text-align: left;”>
Ethernet adapter Local Area Connection 3:
<li style=”text-align: left;”>Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
<li style=”text-align: left;”>
Ethernet adapter Local Area Connection:
<li style=”text-align: left;”>Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : router.home

 

Here is the result for Computer B from Room A where everything works:

• Ethernet adapter Local Area Connection 3:
• Media State . . . . . . . . . . . : Media disconnected
  Connection-specific DNS Suffix . :
• Ethernet adapter Local Area Connection:
  Connection-specific DNS Suffix . : router.home
  IPv4 Address. . . . . . . . . . . : 10.0.1.1
  Subnet Mask . . . . . . . . . . . : 255.255.255.0
  Default Gateway . . . . . . . . . : 10.0.1.1

 

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Now do Computer A in room B with the same ipconfig /all  As that indicates that it’s not getting info over that cable.

 

Also it’s set to pick up DHCP and not set for a static IP address right?

Susan Bradley Patch Lady/Prudent patcher

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“Media disconnected” means you have a bad cable / connector.

Do you have another cable you can test in room B?

cheers, Paul

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Actually, the “media disconnected” message can be caused by several different things besides a bad cable and we already know the cable from room A to room B “should” be good because computer A works just fine in room B using that exact cable.

So the problem is likely one of the other causes of that message.

1st, try resetting computer B’s Windows Sockets and IP stack configurations by opening an “elevated” cmd prompt (i.e. Run as administrator) and entering the following commands one at a time.

netsh winsock reset

netsh int ipv4 reset

netsh int ipv6 reset

Restart computer B so it recreates the appropriate Windows Sockets and IP stack configurations and see if that fixes your problem?

2nd, try running the Network Adapter troubleshooter (WinKey + R and enter msdt.exe -id NetworkDiagnosticsNetworkAdapter) and see if it can detect and fix the problem.

3rd, open the “Network Connections” control panel (WinKey + R and enter ncpa.cpl), right click the Ethernet adapter, select Properties and disable (i.e. uncheck) “Internet Protocol version 6 (TCP/IPv6)”.

4th, open the “Network Connections” control panel, right click the Ethernet adapter, select Properties, select the Sharing tab and ensure “Allow other network users to connect through this computer’s Internet connection” is unchecked.

If none of the above helps and the Ethernet status in the “Network Connections” control panel shows Network cable unplugged, then either there’s something wrong with the cable between room A & B (maybe the small locking tab on the connector on the room B end of the cable broke off?) or there’s something wrong with the ethernet port on computer B the cable plugs into (possibly one of the pins inside it is bent?)

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Susan Bradley wrote:

Also it’s set to pick up DHCP and not set for a static IP address right?

it is DHCP. No static IP.

n0ads wrote:

1st, try resetting computer B’s Windows Sockets and IP stack configurations by opening an “elevated” cmd prompt …. and IP stack configurations and see if that fixes your problem?

This has gotten Computer B to connect to the router but it is very slow. I will try the next steps and see if speed improves. Otherwise, will leave it for now and see if it improve over time.

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I ran thru the other steps and it is still slow but at least it is connect now and can stream music in Room B at very low 144p. Thanks n0ads and others.

I have 25MB up and down. In Room A, Computer B gets 20MB up and 21MB down.   But in Room B, Computer B gets 1MB up and 0.6MB down. But Computer A in Room B gets 21 up and 19 down. There is something strange going on with either cable or the ethernet port on tower or something else. I will have try to pull a new ethernet cable thru the walls but may be will lay out on the floor thru the halls to get to the router and see if it works. But have only short 25′ spares ethernet cables at the moment. Will need to get at least 250′ if run it on the floor thru the halls to the room with router to test before try to pull it thru the wall. Plus will need to tell everyone not to close the doors or trip on it.

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Windows wrote:

But Computer A in Room B gets 21 up and 19 down

That would suggest that it’s not the cable.

Don't take yourself so seriously, no one else does 🙂
All W10 Pro at 22H2,(2 Desktops, 1 Laptop).

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But not prove it. Replacing the cable is the only real test.

cheers, Paul

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Seems like maybe there’s still an old setting somewhere that’s effecting how fast the adapter can run.

Here’s how to completely clear all the settings for it.

On computer B, open Device Manager > Network adapters > the name of the Ethernet connection, right-click it and select Uninstall Device. (if given the option, select the remove all driver files.)

Reboot the computer and, when it detects the adapter and installs the driver for it, all the settings will be back at their default values.

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Before going through the hassle of running a new cable I would change the connector to see if that solves it. Have had similar issue before.

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