From SME Server


Internet Protocol bandwidth measuring tool Iperf is a modern alternative for measuring TCP and UDP bandwidth performance, allowing the tuning of various parameters and characteristics.


  • Measure bandwidth, packet loss, delay jitter
  • Report MSS/MTU size and observed read sizes.
  • Support for TCP window size via socket buffers.
  • Multi-threaded. Client and server can have multiple simultaneous connections.
  • Client can create UDP streams of specified bandwidth.
  • Multicast and IPv6 capable.
  • Options can be specified with K (kilo-) and M (mega-) suffices.
  • 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.
  • Print periodic, intermediate bandwidth, jitter, and loss reports at specified intervals.
  • Server can be run as a daemon.
  • Use representative streams to test out how link layer compression affects your achievable bandwidth.


You need to activate the Dag reposity before installing this contrib.

see dag repository

This contrib can be found in the Dag repository. To install this contrib get shell access as root user and issue the following command:

yum install iperf --enablerepo=dag