Iperf: a tool to measure the bandwidth and the quality of a network

How to install and use iperf
http://openmaniak.com/iperf.php

The source code is available at:
http://sourceforge.net/projects/iperf/

iperf(1)

NAME

iperf - Modified version of a tool for measuring maximum TCP and UDP bandwidth in the sense that also a bandwidth for TCP may be specified

DESCRIPTION

This program iperf is the modified version of the original iperf program. This version allows that also a bandwidth for TCP may be specified. This can be done with the option -a which was not available in the original version.

USAGE

Usage: iperf [-s|-c host] [-p port] [-t secs] [-w bytes] ...
      iperf [-h|--help] [-v|--version]

Client/Server:
 -f, --format    [kmKM]   format to report: Kbits, Mbits, KBytes, MBytes
 -i, --interval  #        seconds between periodic bandwidth reports
 -l, --len       #[KM]    length of buffer to read or write (default 8 KB)
 -m, --print_mss          print TCP maximum segment size (MTU - TCP/IP header)
 -p, --port      #        server port to listen on/connect to
 -u, --udp                use UDP rather than TCP
 -w, --window    #[KM]    TCP window size (socket buffer size)
 -B, --bind         bind to , an interface or multicast address
 -M, --mss       #        set TCP maximum segment size (MTU - 40 bytes)
 -N, --nodelay            set TCP no delay, disabling Nagle's Algorithm
 -V, --IPv6Version        Set the domain to IPv6

Server specific:
 -s, --server             run in server mode
 -D, --daemon     run the server as a daemon

Client specific:
 -a, --tcp_bandwidth \    for TCP, bandwidth to send at in bits/sec
    #[KM]    (default no bandwidth limit used)
 -b, --bandwidth #[KM]    for UDP, bandwidth to send at in bits/sec
                          (default 1 Mbit/sec, implies -u)
 -c, --client       run in client mode, connecting to
 -n, --num       #[KM]    number of bytes to transmit (instead of -t)
 -t, --time      #        time in seconds to transmit for (default 10 secs)
 -F, --fileinput    input the data to be transmitted from a file
 -I, --stdin              input the data to be transmitted from stdin
 -P, --parallel  #        number of parallel client threads to run
 -S, --tos       #        set type-of-service for outgoing packets
 -T, --ttl       #        time-to-live, for multicast (default 1)
 -W, --windowSizeSuggest  Run the client so as to suggest a suitable window size (default off)

Miscellaneous:
 -h, --help               print this message and quit
 -v, --version            print version information and quit

[KM] Indicates options that support a K or M suffix for kilo- or mega-

The TCP window size option can be set by the environment variable
TCP_WINDOW_SIZE. Most other options can be set by an environment variable
IPERF_, such as IPERF_BANDWIDTH.

Report bugs to 

ORIGINAL IPERF DOCUMENTATION

http://dast.nlanr.net/Projects/Iperf/

The documentation.

http://dast.nlanr.net/Projects/Iperf/iperfdocs_1.6.html

The Iperf V. 1.6 User Docs.

SEE ALSO

jperf(1)

---

http://staff.science.uva.nl/~jblom/gigaport/tools/man/iperf.html