-c --client <host> run in client mode, connecting to <host>
-f --format [kmKM] format to report: kbits/sec mbits/sec KBytes/sec MBytes/sec (bandwindth:在小[km]會是 kbits/sec mbits/sec ;transfer:在大小[kmKM]沒有變化 )
-i --interval #seconds between periodic bandwidth reports
-n --num #[KM] number of bytes tp transmit (instead of -t) (最小128KBytes...256KBytes)
-s --server run in server mode
-t --time #time in seconds to transmit for (default 10 secs)
-u --udp use UDP rather than TCP
-w --window #[KM] TCP window size (socket buffer size) (設定1就為 TCP window size:2.00 KByte (warning requested 1.00 Byte))