IPERF(1) User Commands IPERF(1)

NAME iperf - measure network performance

SYNOPSIS iperf [-s|-c host] [options]

   iperf  [-h|--help] [-v|--version]

DESCRIPTION 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
          <host>   bind to <host>, an interface or multicast address

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

   -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

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

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

Client specific: -b, –bandwidth #[KM] for UDP, bandwidth to send at in bits/sec (default 1 Mbit/sec, implies -u)

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

   -d, --dualtest
          Do a bidirectional test simultaneously

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

   -r, --tradeoff
          Do a bidirectional test individually

   -t, --time
          #        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 #
          port to recieve bidirectional tests back on

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

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

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 vari?
   able IPERF_<long option name>, such as IPERF_BANDWIDTH.

REPORTING BUGS Report bugs to dast@nlanr.net

iperf 2.0.1 November 2004 IPERF(1)