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Testing network speed

Users have recently reported that the internet has slowed. It has, but I want to check it is actually the Internet connection. What software and/or methods can I use to test the network speed internally between switches?
3 Solutions
Kruno DžoićSystem EngineerCommented:
You can use http://www.pcausa.com/Utilities/pcattcp.htm

Test TCP (TTCP) is a command-line sockets-based benchmarking tool for measuring TCP and UDP performance between two systems.

I would recommend using wire shark for testing against the machines that are exhibiting the slowness. If you also use a base image in your environment i would suggest using a machine that is not part of the domain and or network i.e a test machine that has la flavor of Linux on it and then you can run unbiased tests. This will factor out the application levels. Wire shark will point you in the direction you can also setup a mirror port configuration on a switch to capture traffic via wire shark of those hosts that appear to be slow. What times does is say they are slow. figure out if you are in deed pegging your link you can contact your ISP to find out usage statistics and at what times they will provide this to you upon request.
Jperf can provide speed tests between PC's and/or servers.  It doesn't test individual switches, but rather the end to end connection

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