Every now and then I’ll get the server guys telling me to check the speed of our network.  For instance, when they try to copy over a 100+ Gig file from one server to another server over an OC-3 line, they will complain that they are only getting like 5MB/s.  They think since it’s a [...]

Side A (Host 10.20.20.100 doing the connection to 172.16.20.100 ) iperf -c 172.16.20.100 -w 4mb Side B (Host 172.16.20.100 listening for the connection) iperf -s Result: iperf -c 172.16.20.100 -w 4mb ———————————————————— Client connecting to 172.16.20.100, TCP port 5001 TCP window size: 3.81 MByte ———————————————————— [128] local 10.20.20.100 port 3460 connected with 172.16.20.100 port 5001 [...]