root@opnsense:~ # iperf3iperf3: parameter error - must either be a client (-c) or server (-s)Usage: iperf3 [-s|-c host] [options] iperf3 [-h|--help] [-v|--version]Server or Client: -p, --port # server port to listen on/connect to -f, --format [kmgtKMGT] format to report: Kbits, Mbits, Gbits, Tbits -i, --interval # seconds between periodic throughput reports -I, --pidfile file write PID file -F, --file name xmit/recv the specified file -A, --affinity n/n,m set CPU affinity -B, --bind <host> bind to the interface associated with the address <host> -V, --verbose more detailed output -J, --json output in JSON format --logfile f send output to a log file --forceflush force flushing output at every interval --timestamps<=format> emit a timestamp at the start of each output line (optional "=" and format string as per strftime(3)) --rcv-timeout # idle timeout for receiving data (default 120000 ms) -d, --debug[=#] emit debugging output (optional optional "=" and debug level: 1-4. Default is 4 - all messages) -v, --version show version information and quit -h, --help show this message and quitServer specific: -s, --server run in server mode -D, --daemon run the server as a daemon -1, --one-off handle one client connection then exit --server-bitrate-limit #[KMG][/#] server's total bit rate limit (default 0 = no limit) (optional slash and number of secs interval for averaging total data rate. Default is 5 seconds) --idle-timeout # restart idle server after # seconds in case it got stuck (default - no timeout) --rsa-private-key-path path to the RSA private key used to decrypt authentication credentials --authorized-users-path path to the configuration file containing user credentials --time-skew-threshold time skew threshold (in seconds) between the server and client during the authentication processClient specific: -c, --client <host>[%<dev>] run in client mode, connecting to <host> (option <dev> equivalent to `--bind-dev <dev>`) --sctp use SCTP rather than TCP -X, --xbind <name> bind SCTP association to links --nstreams # number of SCTP streams -u, --udp use UDP rather than TCP --connect-timeout # timeout for control connection setup (ms) -b, --bitrate #[KMG][/#] target bitrate in bits/sec (0 for unlimited) (default 1 Mbit/sec for UDP, unlimited for TCP) (optional slash and packet count for burst mode) --pacing-timer #[KMG] set the timing for pacing, in microseconds (default 1000) --fq-rate #[KMG] enable fair-queuing based socket pacing in bits/sec (Linux only) -t, --time # time in seconds to transmit for (default 10 secs) -n, --bytes #[KMG] number of bytes to transmit (instead of -t) -k, --blockcount #[KMG] number of blocks (packets) to transmit (instead of -t or -n) -l, --length #[KMG] length of buffer to read or write (default 128 KB for TCP, dynamic or 1460 for UDP) --cport <port> bind to a specific client port (TCP and UDP, default: ephemeral port) -P, --parallel # number of parallel client streams to run -R, --reverse run in reverse mode (server sends, client receives) --bidir run in bidirectional mode. Client and server send and receive data. -w, --window #[KMG] set send/receive socket buffer sizes (indirectly sets TCP window size) -C, --congestion <algo> set TCP congestion control algorithm (Linux and FreeBSD only) -M, --set-mss # set TCP/SCTP maximum segment size (MTU - 40 bytes) -N, --no-delay set TCP/SCTP no delay, disabling Nagle's Algorithm -4, --version4 only use IPv4 -6, --version6 only use IPv6 -S, --tos N set the IP type of service, 0-255. The usual prefixes for octal and hex can be used, i.e. 52, 064 and 0x34 all specify the same value. --dscp N or --dscp val set the IP dscp value, either 0-63 or symbolic. Numeric values can be specified in decimal, octal and hex (see --tos above). -Z, --zerocopy use a 'zero copy' method of sending data -O, --omit N perform pre-test for N seconds and omit the pre-test statistics -T, --title str prefix every output line with this string --extra-data str data string to include in client and server JSON --get-server-output get results from server --udp-counters-64bit use 64-bit counters in UDP test packets --repeating-payload use repeating pattern in payload, instead of randomized payload (like in iperf2) --dont-fragment set IPv4 Don't Fragment flag --username username for authentication --rsa-public-key-path path to the RSA public key used to encrypt authentication credentials[KMG] indicates options that support a K/M/G suffix for kilo-, mega-, or giga-iperf3 homepage at: https://software.es.net/iperf/Report bugs to: https://github.com/esnet/iperf
