Package iperf

Measurement tool for TCP/UDP bandwidth performance

http://sourceforge.net/projects/iperf2

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.

General Commands (Section 1)
iperf
iperf is a tool for performing network throughput measurements. It can test either TCP or UDP throughput. To perform an iperf test the user must establish both...