How to DIAGNOSE slow network speed.

  • Thread starter Thread starter Ian Boyd
  • Start date Start date
I

Ian Boyd

i'm getting about 6Mbps on a 100Mbps LAN. Windows XP Professional talking to
Windows 2000 Server, through a 10/100 switching hub. Both machines have
100Mb cards.

i've used performance monitor, and see no abnormal errors in IP, TCP, NBT,
or Network Interface.

i sit in CommView (packet sniffer) and i see my data moving. It's just
moving slow.

Why is it so slow? How can it be slow? The network card accesses the
ethernet wire, it dumps some data on the wire.
Electricity doesn't take time to get from here to there, electrical signals
move essentially at the speed of light.

What is so hard about it not running full speed? Why would it not be
working? What can i see to see that it isn't working? Are there errors when
the network card tried to access the wire? Can i see that anywhere? Are
there collissions? No, it's a switching hub, but can i can see them
anywhere? Are the packets fragmenting on the way to the server? i doubt it,
but can i see that anywhere? Are my responses not coming fast enough? Can i
see the time it takes?


Why is my network slow? And if you say change your cables, NICs, or NIC
drivers, i will choke your tongue out.
 
Ian said:
Have you looked at your ICMP traffic? You may have the
Welchia Virus.



Professional talking to


machines have


in IP, TCP, NBT,


moving. It's just


accesses the


electrical signals


would it not be


there errors when


anywhere? Are


can see them


server? i doubt it,


fast enough? Can i


cables, NICs, or NIC
Click to expand...

Is your NIC configured optimally? For many NICs, they come set as
"hardware default" for speed, or to "auto". You may need to set it to
100Mbps, Full Duplex, to get optimal throughput, because the auto
setting doesn't always work right...
 
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