100Bt link bouncing

Lenovo / Thinkpad t400
April 21, 2010 at 14:32:04
Specs: Windows XP SP3
I added a new Lenovo on a small LAN that keeps toggling link up/down. If I disable the network adapter on a Dell connected to the same LAN the Lenovo link stays up. Enable the Dell and the Lenovo link restarts it's link up/down behavior. Any ideas on what to do is appreciated.

See More: 100Bt link bouncing

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#1
April 21, 2010 at 14:36:59
Could be a conflict in IP addresses between the two. Try ipconfig /release then ipconfig /renew from the command line (start - run - cmd) to obtain a new address from your router or try statically assigning addresses to the interface card.

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#2
April 21, 2010 at 14:39:03
Sorry, I should have mentioned that I have tried this already. Thanks.

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#3
April 21, 2010 at 14:52:16
What sort of switch are your running for your lan? Could there be config on your switch causing the problem? Are you running a vlan anything like that?

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Related Solutions

#4
April 21, 2010 at 14:52:32
What does the event viewer show, when this happens?

The original poster should always write the last response !!!
Let us know, if the problem is solved !!!


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#5
April 21, 2010 at 19:50:28
Event viewer shows e1yexpress warnings: Link has been disconnected and e1yexpress information: Link has been connected. and a TCPIP message fro each time the link is established. There is nothing else network related in the log.

Interesting note is my router shows dropped packets that correspond to the link errors but the network remains functional albeit a bit slower. I also use a VPN client and that connection remains up during this. I have a cable modem connected to a DI-524 and all I see there are dropped packets.

I have accumulated some network knowledge over the years but I've never seen a system cause link problems on another system.


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#6
April 21, 2010 at 21:14:30
I guess we have to clarify some things.

Your e1yexpress connection has been dropped
Is this the network card, you also running the vpn client on?

If not, how many network card are you using?
And in addition, it would be helpful, if you would post the result of an
ipconfig /all

when all things are running.
Means, if you're normally using you local connection for internet and at the same time running the vpn client and connection is established, you should make an ipconfig /all, when all is as described.

The original poster should always write the last response !!!
Let us know, if the problem is solved !!!


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#7
April 21, 2010 at 21:48:02
I would like to avoid posting the info from ipconfig for security reasons.

The e1yexpress messages are from the system that's toggling it's link up/down. it does this if the VPN client is connected or not connected. The problem goes away only if I disconnect or disable the network adapter in another system (Dell PC) on the same network. Both systems have one wired NIC. There is also a printer on the LAN.

All hosts use DHCP and get their IP's from the DI-524.

What specifically are you looking for in the ipconfig output?


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#8
April 21, 2010 at 21:56:19
First, ipconfig /all normally doesn't show any things, the world shouldn't know, because normally it only shows private ip addresses. If there are any public ip addresses, simply change it to e.g. 212.x.x.x or something like that.

So ok, now, that I know, that there are several network devices connected, it's more interesting, to look at the ipconfig /all, because maybe there are address conflicts or something like that.
Also default gateway and dns server settings are worth to take a look at it.

I wonder, why this happens only, if the Dell PC is also connected.
So maybe, you're researching at the wrong PC.

The original poster should always write the last response !!!
Let us know, if the problem is solved !!!


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#9
April 21, 2010 at 22:24:55
"So maybe, you're researching at the wrong PC" I had thought the same thing and took the Lenovo to a neighbor's house and had no problems with the link on their network. So trying to simplify things I disconnected everything on my network and reconnected things one at a time. That's how I determined that the Dell was causing the link up/down problem on the Lenovo.

There's nothing in the event viewer on the dell that points to a network problem. and both systems are connected to the Internet and browse fine.

ipconfig from the lenovo
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . xx.xx.com
Description . . . . . . . . . . . : Intel(R) 82567LM Gigabit Network Connection
Physical Address. . . . . . . . . : 00-22-68-XX-XX-XX
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.0.101
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. . . . . . . . . . : Wednesday, April 21, 2010 11:34:05 P
M
Lease Expires . . . . . . . . . . : Wednesday, April 28, 2010 11:34:05 P
M

ipconfig from the Dell
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . : xx.xx.com
Description . . . . . . . . . . . : Intel(R) PRO/100 VE Network Connecti
on
Physical Address. . . . . . . . . : 00-12-3F-XX-XX-XX
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.0.103
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. . . . . . . . . . : Wednesday, April 21, 2010 4:12:22 PM

Lease Expires . . . . . . . . . . : Wednesday, April 28, 2010 4:12:22 PM


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#10
April 21, 2010 at 22:57:25
Look ok so far.

So when the Dell PC is also connected to the router and you don't start anything on any PC, what happens at the router itself?
If there one or more LEDs blinking heavily, so that it looks like there is a lot of traffic, like a big download?
And if so, disconnect the Lenovo and check the routers LEDs again.
If it further more seem like heavy traffic, the network card of the Dell PC might be fried.

The original poster should always write the last response !!!
Let us know, if the problem is solved !!!


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#11
April 22, 2010 at 06:41:35
Yes the router LED's blink heavily when the Dell is NIC is connected and the systems are idle.

I think I'll check with Dell for bugs and updates and if I don't get anywhere with that I'll see if I can buy a new NIC for it.

Thanks for your time and help.


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#12
April 22, 2010 at 09:27:30
What I would try now is, to restart the Dell PC and keep an eye on the routers LEDs.
So when did the LEDs do start blinking heavily, during the windows startup process.
Or maybe it starts directly, when you trun on the Dell Computer.
In that case, the NIC of the Dell is corrupt and you have to replace it.

The original poster should always write the last response !!!
Let us know, if the problem is solved !!!


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#13
April 22, 2010 at 11:22:14
I'm going to replace the NIC in the Dell. Doesn't it seem odd that the Dell network appears to work fine yet it's causing the Lenovo to drop it's link. And if I put another system in place of the Lenovo it works without error?

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#14
April 22, 2010 at 14:12:16
This corruption is called "Jabber".
Jabber is, when a network device, in your case the network card send out faulty signals to your network.
This can cause to paralyze parts or the whole network.
The machine, that has the faulty network card, could work fine, while the rest gets lots of problems, collissions.
This would also explain the blocked packets at the router.

The original poster should always write the last response !!!
Let us know, if the problem is solved !!!


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#15
April 23, 2010 at 13:40:03
So I bought a PCI NIC card installed it and viola, the links are staying up on all systems. Thanks to all.

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