How do I know the leased line current speed?

I work in a bank ,and I have two agencies that connect using a dedicated line (Modem and router), the line is 256 Kbs, but all agencies computer are very slow. all of them with no exception, I suspect is network cad that is getting too much data, so a put a access list on the port. but tthe connection and computers still slow.. so i suspect that the line is not working at 256 ? there is any method that I can check the current  speed opf the link ???
sciencedicasAsked:
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JFrederick29Commented:
You can graph bandwidth utilization via SNMP using MRTG or some other network monitoring software (Solarwinds, Cacti) or you can check the 5 minute average real time on the router but without history.
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JFrederick29Commented:
Sorry, the "show int <interface name>" command will show you the current 5 minute input/output average.
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sciencedicasAuthor Commented:
there is any more reason why all systems of that agency goes so slow ? all computer are brand new, and witouth network connect they work fine, but one on the network the problem begin
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JFrederick29Commented:
What do you mean with the network connection?  Meaning they access resources locally versus remote over the 256 line?
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sciencedicasAuthor Commented:
I mean, when I quit the network cabe from the NIC the computers wirk fine, but as sun as I connect the network cabe in the interface the perfromance goes down.
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JFrederick29Commented:
Do you have any experience with packet captures? Wireshark/Ethereal?  You could capture traffic on one of the PC's and see if it indicates any issues.
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sciencedicasAuthor Commented:
I download the PGRT networl monitor, and it seens to work fine, I 'll try no find out more with this wonderfull tool, thank you very muih, it's helps a lot.
greetings from cape verde
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giltjrCommented:
A 256 Kbps link is does not provide that much capacity.  Once you take into account overhead you might get about 28-30 KBps.

Back in the days of dumb terminal only traffic, that was a LOT of bandwidth considering that a single transaction on a dumb terminal might generate a total of 1,000 to 1,500 bytes of traffic.  But in today's web based and file sharing based networks, a single web transaction might generate 50,000 - 100,000 bytes of traffic.

You should also get a packet trace (like JFrederick29 suggested) to see what traffic is flowing.  I have seen sites where in their path statement they have a mapped drive that is on a server that is access over a WAN.  If you have to have one, you need to make sure it is LAST in the path, not upfront.
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