“Wireless clients are experiencing very slow speed” , is a common problem on a wireless lan environment.
As part of troubleshooting this, we got to take care of
During the course of troubleshooting, we do need a way to test the throughput, as and when we make any changes.
IPERF comes as a very handy tool. This can easily tell us the speed of data transfer.
Here are the details for the IPERF test.
( -P refers to the number of parallel TCP streams and –w referes to the TCP window size )
Iperf was orginally developed by NLANR/DAST as a modern alternative for measuring TCP and UDP bandwidth performance.
Iperf is a tool to measure maximum TCP bandwidth, allowing the tuning of various parameters and UDP characteristics. Iperf reports bandwidth, delay jitter, datagram loss.
* Where appropriate, options can be specified with K (kilo-) and M (mega-) suffices. So 128K instead of 131072 bytes.
* Can run for specified time, rather than a set amount of data to transfer.
* Picks the best units for the size of data being reported.
* Server handles multiple connections, rather than quitting after a single test.
* Print periodic, intermediate bandwidth, jitter, and loss reports at specified intervals.
* Run the server as a daemon.
* Run the server as a Windows NT Service
* Use representative streams to test out how link layer compression affects your achievable bandwidth.
does the goodput is also can be meausured by iperf?
thanks for your input victor,
did you have any tips for troubleshooting or conformation for a customer?
It might be helpful to update this article to reflect that the engineer will probably want the iperf output from the client side as well as the output from 'show client detail <mac>' from the wireless controller.