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Problems connecting two machines.

Posted on 2003-03-29
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Last Modified: 2013-11-09
Hey
I am trying to connect a laptop(XP) and my desktop(2kpro) with a crossover cable and two NIC.I have setup up the workgroup and ip address and they both can see each other but the transfer rate is very slow-30k a sec.
I know the laptop isn't the problem or the cable as I have used them on different setups so it must be my desktop.
I have uninstalled the NIC and reinstall it but it hasn't helped.Also I can't uninstall tcp/ip-keeps giving me an error about Basic tcp/ip services & Unix printer still require tcp.

Is there any settings that would cause such a drop in transfer rates???

Any thoughts??
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Question by:eoinb
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21 Comments
 
LVL 13

Expert Comment

by:magarity
ID: 8231848
OK, right-click My Network Places on XP ('neighborhood network under 2000) and select properties.  Then doubleclick the network connect,  A box will come up telling the connection status and speed.  Please report back here with the speed.  You may need to manuall set the cards to half-duplex for better speed.

Oh, what is the brand and model of the two network cards in question?
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Author Comment

by:eoinb
ID: 8231863
It is D-Link DFE-538TX NIC.

The connection speed is 100Mb per second.
What would you recommend-100Mb half-duplex
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LVL 21

Expert Comment

by:wyliecoyoteuk
ID: 8232003
If you only have 2 machines on a crossover, lock them both to 100Mbit or 10Mbit (half or full duplex) and see which works best.
Most common cause of crossover errors is autonegotiation failures, followed by crosstalk on long cables.

10 Mbit/sec is faster than most PCs end up feeding data to the pipe anyway, so you will probably not notice the difference between 10M half duplex and 100M full duplex on a crossover.
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LVL 13

Expert Comment

by:magarity
ID: 8232134
"What would you recommend-100Mb half-duplex "

I would recommend trying both 10 and 100 at half duplex to see if either work or which is fastest.  This is a common occurance with crossover cables.
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Author Comment

by:eoinb
ID: 8237876
When I lock it to 10 Full/Half I get about a 1mb per sec.This is an improvement but I know it can do 6-7mb per sec...any more ideas on how to speed it up-too much error checking or something?
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Expert Comment

by:EuricoJR
ID: 8238941
HI,
It could also be the crossover category cable, example CAT5 CABLE  are exelente because the transfere rate is  100mbps, and if you have configured your network card to half or full duplex ,10 or 100, and you have a porr crossover cable it not worth it.
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LVL 2

Expert Comment

by:jlindq
ID: 8239004
Also note that 10Mbps = 1 MB/s, roughly. So you will only get 1 MegaByte per second transfer rates if you're running at 10 MegaBits per second.
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LVL 13

Expert Comment

by:magarity
ID: 8239352
"When I lock it to 10 Full/Half I get about a 1mb per sec"

This is correct.  I take it that 100/half didn't work.  As already noted, 10 megaBITs divided by 8 bits per byte gives 1.2 megaBYTES per second.

This half duplex operation as noted is a symptom of using a direct crossover cable.  If you need more speed you'll have to invest in a switch so you can turn up the speed to 100/full.

Here is a mystery brand for only $15:
http://www.comready.com/ad5por10swit.html
And a nice name brand for only $23:
http://www.comready.com/dlin5pordess.html
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Author Comment

by:eoinb
ID: 8239362
I have transferred before using the two machines and cables and I was getting the 6-7MB per second.I also check the cable on the laptop and another machine and it was also getting 6-7MB so I am sure it isn't the cable.
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Author Comment

by:eoinb
ID: 8239436
I have transferred before using the two machines and cables and I was getting the 6-7MB per second.I also check the cable on the laptop and another machine and it was also getting 6-7MB so I am sure it isn't the cable.
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LVL 13

Expert Comment

by:magarity
ID: 8240257
If the other machines' network cards play better together then you can use 100/full or 100/half and get better speeds.  Doing the math, there is no way to get 10Mbits/8 bits per byte to equal 6 to 7 mbytes.

You might also try some XP performance tweaks to squeeze a little more:
http://www.tweakxp.com/tweakxp/performance_tweaks.asp
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LVL 21

Expert Comment

by:wyliecoyoteuk
ID: 8241133

1.NIC>NIC autonegotiation often fails.
2. Hubs generally improve autonegotiation.
3. Any repeater (hub or switch)  will usually improve signal integrity, just because it generates a new square wave.
i.e. If you have a hub or switch, there is a certain amount of signal regeneration, which crossover cable cannot provide.

I have had poor crossover results, where a cheap hub improved the speed and integrity of transfer.

It is more often a case of compatability between network cards, and how fast the NIC can pass data to the network.
Setting a fixed speed will usually improve things.

A better NIC will often improve things (i.e.cheap cards often acheive a fraction of the speed of branded, are less likely to succesfully autonegotiate, and handle the pipe less well).

No matter how fast your network is, the wire can only pass info as fast as it receives it.
HDD speed, IDE bus speed, CPU speed, PCI Bus speed, NIC speed,  poor Drivers, can all cause bottlenecks.

Your transfer speed can only be as fast as your slowest component.

0
 

Author Comment

by:eoinb
ID: 8244820
wyliecoyoteuk
"It is more often a case of compatability between network cards, and how fast the NIC can pass data to the network."

Is there any way to test compatability between NIC's or for bottlenecks?Neither machine is what U would call slow-1.9ghz p4 laptop and a 2200xp athlon.

magarity
"If the other machines' network cards play better together then you can use 100/full or 100/half and get better speeds.  Doing the math, there is no way to get 10Mbits/8 bits per byte to equal 6 to 7 mbytes."

I might be confusing you with my Mb/mb/MB etc.
It used to take me 3 minutes to transfer 1GB of data(A VOB file),but since I reinstalled the card it is taking me 17-18 minutes.
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Author Comment

by:eoinb
ID: 8244861
wyliecoyoteuk
"It is more often a case of compatability between network cards, and how fast the NIC can pass data to the network."

Is there any way to test compatability between NIC's or for bottlenecks?Neither machine is what U would call slow-1.9ghz p4 laptop and a 2200xp athlon.

magarity
"If the other machines' network cards play better together then you can use 100/full or 100/half and get better speeds.  Doing the math, there is no way to get 10Mbits/8 bits per byte to equal 6 to 7 mbytes."

I might be confusing you with my Mb/mb/MB etc.
It used to take me 3 minutes to transfer 1GB of data(A VOB file),but since I reinstalled the card it is taking me 17-18 minutes.
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LVL 2

Expert Comment

by:jlindq
ID: 8244936
1GB/3min = 5MB/s ~= 50 Mb/s. So you must have used 100 Mb settings. 18 minutes means about 9 Mb/s, so you've basically maxed it if you're running at 10 Mb/s.
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Author Comment

by:eoinb
ID: 8247213
Yes when I got the 5MB's it was running at Auto Select,but when I run it at Auto select now select now I about 30k's!!
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LVL 21

Expert Comment

by:wyliecoyoteuk
ID: 8248709
It is usually the NICs that are the bottleneck:(

How fast the computer is does not affect the network speed.
File transfer is affected by the following:

Network speed
NIC speed
PCI bus speed
hard drive speed
IDE bus speed
Memory bus speed
CPU speed
cpu cache
hard drive cache

Using a hub or switch instead of a crossover will often resolve autonegotiation failures, and allow full speed network operation.

If you run at 100Mbit on the wire, and you have problems, (noise, crosstalk, errors) it will often be slower than 10MBit, because it is having to resend the same data repeatedly.
How long is the cable?
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Author Comment

by:eoinb
ID: 8261815
The cable is 3m long.

The thing I don't understand is that I used the same setup a few weeks ago and I was getting 5MB per sec.I then changed my CPU-so I had to take out my network card,and when I reinstalled it it was VERY slow.
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by:CleanupPing
ID: 9152809
eoinb:
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ID: 10088743
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I will leave the following recommendation for this question in the Cleanup topic area:

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