Solved Lan network speed dropped to very low.

Asus P5gd2 premium motherboard
April 26, 2013 at 21:47:06
Specs: Win 7 64, 4
2 pcs connected with a TPlink modem/switch. wired connection.

One pc running win7 64, other xp sp3. Both home pcs..

Used to get about 10mbs transfer speed. ( I know its low, but was more than happy with it as I never use it to transfer large files.

But suddenly transfer speed changed to just 8kbps. Its kind of a speed limit activated.

I can just browse files and folders but cannot copy at 8kbps.
Any help would be appreciated.


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#1
April 27, 2013 at 12:03:02
Have you spoken to your server about it?

Always pop back and let us know the outcome - thanks


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#2
April 27, 2013 at 21:20:35
✔ Best Answer
Used to get about 10mbs transfer speed

Are you talking about LAN bandwidth here, or your internet connection rate?

If your internet connection, then like Derek says, you'll need to contact your ISP about that.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#3
April 27, 2013 at 22:22:47
I am not talking about internet, internet speeds are fine. Its the transfer speed between the two pcs I am talking about.

I have only 2 pcs connected via a modem/switch. both pcs have internet through this modem. and internet speeds are fine.

I have shared drives in both pcs. when i copy a file, say a film, from one pc to another, I am getting only 8kbps speed.

but I used to get 10 mbps.

If you need any more info pls tell me.


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Related Solutions

#4
April 28, 2013 at 06:43:16
The device you have your computers plugged in to, what bandwidth is it rated for (ie: 10/100/1000 Mbps)?

The network interfaces on the computer themselves, what bandwidth are they rated for?

Check each interface and tell us what rate it's connecting at.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#5
April 28, 2013 at 08:15:10
How much free space do you have on the drives?

How big are the files you're transferring?

Is the file transfer any faster when done from the command line instead of through Windows explorer?

Is your drive highly fragmented?

Do you have an anti virus program running and is it scanning the files during the copy process?

Do you have any other process(es) running that might be hogging the system resources?

Have you checked the Performance and Networking stats with task manager before, during, and after the file transfer?


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#6
April 28, 2013 at 08:30:47
If you want to do some low level troubleshooting, you could use a packet capture tool, such as Wireshark to learn and analyze what is being transferred.

One thing you might find is that there are lots of retransmissions of packets which slows down the copy process.


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#7
April 29, 2013 at 11:52:37
Sorry for late reply

@Curt R, I have a 100mbps router and both pcs mobo ports are 100mbps.

@ FishMonger ,

free space - more than 500 gb

file size- about 700mb-1000mb


I actually never used cmd for transfer

Drive is not fragmented at all

antiviirus is running, but i dont thinks its a problem

No proccessess runniing that may slow down things..

There is nothing wrong in task manager stats.. it just like normal,

but while copying files the network stats graph gets an invicible limit line at .8% instead of going full.

I will post a pic of task manager in the morning..

I have wireshark but for copying just large files i dont think that would do any help.

But again I am a novice..

Thankyou for replying and sorry for the delay..


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#8
April 29, 2013 at 12:07:38
> antiviirus is running, but i dont thinks its a problem

Have you done anything to confirm your assumption?

> I have wireshark but for copying just large files i dont think that would do any help.

What makes you think it wouldn't help? Knowing what's going on at the packet level could be very informative.

A speed duplex mismatch could cause an undue amount of retransmissions and if that's what is happening here, then that would be the cause to the slowdown.

You need to look at "both sides of the coin". Do the exact same troubleshooting steps on each computer.


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#9
April 29, 2013 at 13:17:58
oh okay... I am actually not a tech guy..

Only one pc have anti virus, and i tried disabling it. but no change in speeds..

Actually I dont know how to use wireshark, I use it just to compete in some forensics challenges on a website.

so where should I start trouble shooting, can you provide me with some steps to do.



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#10
April 29, 2013 at 19:31:17
I would definitely check the duplex settings and ensure they're both the same. Both should be Full Duplex If they're not, force them to 100/Full and test.

To access the network interface settings go to:

Start >> Control Panel >> Network and Sharing Center >> on the top left corner click on "Change Adapter Settings"

Now, right click on the Local Area Connection and select "Properties" from the pulldown menu. In the window that opens, click on the "Configure" button at the top. In the new window, click on the "Link Speed" tab. Under "Speed and Duplex" both should be set to automatic. Even if they are, try forcing both to 100/Full Duplex and do some test transfers.

If this doesn't fix the issue, I suspect your problem could be a bad port on your switch or potentionally a bad network interface on one of the computers. Definitely ensure both computers involved have the most recent Network interface drivers available installed on them and do try other ports on the switch. If you can, borrow a different (known to be good) switch from a friend and test on that as well.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#11
April 29, 2013 at 21:45:55
Before I tried what you said, I found that the speed issue is just to one direction.

I can copy files from windows XP to windows 7 machine at full speed.
http://www.freeimagehosting.net/2dkkz

But in reverse direction, ie from windows 7 to XP. its low speed.
http://www.freeimagehosting.net/i9ln5

Yeah I tried what you said,changed speed from autonegotiated to 100mb/full duplex.

But makes no difference.


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#12
April 30, 2013 at 08:40:47
That is odd. I can't recall ever before encountering a situation wherein a transfer was throttled in one direction, but not the other.

Since you forced both to 100/Full, we know it's not a duplex issue and you can likely reset them back to "automatic".

At this point I would definitely ensure both interfaces have the most up-to-date drivers possible, and I would also definitely try changing ports on your switch. If possible, borrow someone else's switch and test with that too.

One more thing I would try is swapping the cables. If the issue reverses, then one of your cables is the problem. If the issue remains the same (ie: same direction) and you've tried everything else I've mentioned and the problem still persists and in the same direction, I would consider replacing one, or both NIC's.

I would get a NIC (network interface card) and one at a time, I would disable the onboard network interface and install the NIC and it's drivers and then test. This would allow you to troubleshoot both NIC's and hopefully find the faulty one (if it is indeed the NIC and not a cable or switch port).

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#13
May 2, 2013 at 22:22:47
Hmm... I will post future updates here.. If I find a solution..

Thanks for the support..


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#14
May 3, 2013 at 07:17:39
Did you try swapping the cables and if that didn't work, replacing the NIC in both machines (one at a time)?

If not, you really should.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#15
August 16, 2013 at 07:04:11
Other system got damaged. dont mind it any more.

Thanks for your replies


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