NAME

       iperf - perform network throughput tests

SYNOPSIS

       iperf -s [ options ]

       iperf -c server [ options ]

       iperf -u -s [ options ]

       iperf -u -c server [ options ]

DESCRIPTION

       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 a server (to discard  traffic)  and  a
       client (to generate traffic).

GENERAL OPTIONS

       -f, --format
              [kmKM]   format to report: Kbits, Mbits, KBytes, MBytes

       -h, --help
              print a help synopsis

       -i, --interval n
              pause n seconds between periodic bandwidth reports

       -l, --len n[KM]
              set length read/write buffer to n (default 8 KB)

       -m, --print_mss
              print TCP maximum segment size (MTU - TCP/IP header)

       -o, --output <filename>
              output the report or error message to this specified file

       -p, --port n
              set server port to listen on/connect to to n (default 5001)

       -u, --udp
              use UDP rather than TCP

       -w, --window n[KM]
              TCP window size (socket buffer size)

       -B, --bind <host>
              bind to <host>, an interface or multicast address

       -C, --compatibility
              for use with older versions does not sent extra msgs

       -M, --mss n
              set TCP maximum segment size (MTU - 40 bytes)

       -N, --nodelay
              set TCP no delay, disabling Nagle's Algorithm

       -v, --version
              print version information and quit

       -V, --IPv6Version
              Set the domain to IPv6

       -x, --reportexclude
              [CDMSV]   exclude C(connection) D(data) M(multicast) S(settings) V(server) reports

       -y, --reportstyle C|c
              if set to C or c report results as CSV (comma separated values)

SERVER SPECIFIC OPTIONS

       -s, --server
              run in server mode

       -U, --single_udp
              run in single threaded UDP mode

       -D, --daemon
              run the server as a daemon

CLIENT SPECIFIC OPTIONS

       -b, --bandwidth n[KM]
              set target bandwidth to n bits/sec (default 1 Mbit/sec).  This setting requires UDP (-u).

       -c, --client <host>
              run in client mode, connecting to <host>

       -d, --dualtest
              Do a bidirectional test simultaneously

       -n, --num n[KM]
              number of bytes to transmit (instead of -t)

       -r, --tradeoff
              Do a bidirectional test individually

       -t, --time n
              time in seconds to transmit for (default 10 secs)

       -F, --fileinput <name>
              input the data to be transmitted from a file

       -I, --stdin
              input the data to be transmitted from stdin

       -L, --listenport n
              port to receive bidirectional tests back on

       -P, --parallel n
              number of parallel client threads to run

       -T, --ttl n
              time-to-live, for multicast (default 1)

       -Z, --linux-congestion <algo>
              set TCP congestion control algorithm (Linux only)

ENVIRONMENT

       TCP_WINDOW_SIZE
              Controls the size of TCP buffers.

DIAGNOSTICS

       This section needs to be filled in.

BUGS

       Exit statuses are inconsistent.  The threading implementation is rather heinous.

AUTHORS

       Iperf  was  originally  written  by  Mark Gates and Alex Warshavsky.  Man page and maintence by Jon Dugan
       <jdugan at x1024 dot net>.  Other contributions from Ajay Tirumala, Jim Ferguson, Feng Qin, Kevin  Gibbs,
       John  Estabrook  <jestabro  at ncsa.uiuc.edu>, Andrew Gallatin <gallatin at gmail.com>, Stephen Hemminger
       <shemminger at linux-foundation.org>

SEE ALSO

       http://iperf.sourceforge.net/

NLANR/DAST                                         APRIL 2008                                           IPERF(1)