.TH IPERF 1 "July 2010" NLANR/DAST "User Manuals"
.SH NAME
iperf \- perform network throughput tests
.SH SYNOPSIS
.B iperf -s [
.I options
.B ]

.B iperf -c 
.I server
.B [
.I options
.B ]


.SH 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 and a client.


.SH "GENERAL OPTIONS"
.TP
.BR -p ", " --port " \fIn\fR"
set server port to listen on/connect to to \fIn\fR (default 5201)
.TP
.BR -f ", " --format " "
[kmKM]   format to report: Kbits, Mbits, KBytes, MBytes
.TP
.BR -i ", " --interval " \fIn\fR"
pause \fIn\fR seconds between periodic bandwidth reports
.TP
.BR -m ", " --print_mss " "
print TCP maximum segment size (MTU - TCP/IP header)
.TP
.BR -h ", " --help " "
print a help synopsis
.TP
.BR -v ", " --version " "
print version information and quit


.SH "SERVER SPECIFIC OPTIONS"
.TP
.BR -s ", " --server " "
run in server mode


.SH "CLIENT SPECIFIC OPTIONS"
.TP
.BR -c ", " --client " <host>"
run in client mode, connecting to <host>
.TP
.BR -u ", " --udp
use UDP rather than TCP
.TP
.BR -b ", " --bandwidth " \fIn\fR[KM]"
set target bandwidth to \fIn\fR bits/sec (default 1 Mbit/sec). Requires UDP mode (-u)
.TP
.BR -t ", " --time " \fIn\fR"
time in seconds to transmit for (default 10 secs)
.TP
.BR -n ", " --num " \fIn\fR[KM]"
number of bytes to transmit (instead of -t)
.TP
.BR -l ", " --len " \fIn\fR[KM]"
set length read/write buffer to \fIn\fR (default 128 KB)
.TP
.BR -P ", " --parallel " \fIn\fR"
number of parallel client streams to run
.TP
.BR -R ", " --reverse
run in reverse mode (server sends, client receives)
.TP
.BR -w ", " --window " \fIn\fR[KM]"
TCP window size (socket buffer size)
.TP
.BR -M ", " --mss " \fIn\fR"
set TCP maximum segment size (MTU - 40 bytes)
.TP
.BR -N ", " --nodelay " "
set TCP no delay, disabling Nagle's Algorithm


.SH DIAGNOSTICS
This section needs to be filled in.


.SH BUGS
Exit statuses are inconsistent.
Could possibly block indefinitely under some circumstances.


.SH 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>


.SH "SEE ALSO"
http://code.google.com/p/iperf/