$ sudo ip link set mtu 1500 dev eth0

$ nuttcp -v $SMALLER_HOST
nuttcp-t: v6.1.2: socket
nuttcp-t: buflen=65536, nstream=1, port=5001 tcp -> $SMALLER_HOST
nuttcp-t: time limit = 10.00 seconds
nuttcp-t: connect to $SMALLER_HOST with mss=1448, RTT=0.434 ms
nuttcp-t: send window size = 87040, receive window size = 372480
nuttcp-t: available send window = 43520, available receive window = 186240
nuttcp-t: 784.1312 MB in 10.00 real seconds = 80294.00 KB/sec = 657.7685 Mbps
nuttcp-t: retrans = 0
nuttcp-t: 12547 I/O calls, msec/call = 0.82, calls/sec = 1254.68
nuttcp-t: 0.0user 1.4sys 0:10real 15% 0i+0d 1010maxrss 0+0pf 14248+35csw

nuttcp-r: v6.1.2: socket
nuttcp-r: buflen=65536, nstream=1, port=5001 tcp
nuttcp-r: accept from $SMALLER_HOST
nuttcp-r: send window size = 87040, receive window size = 374400
nuttcp-r: available send window = 43520, available receive window = 187200
nuttcp-r: 784.1312 MB in 10.00 real seconds = 80270.75 KB/sec = 657.5780 Mbps
nuttcp-r: 154196 I/O calls, msec/call = 0.07, calls/sec = 15414.94
nuttcp-r: 0.0user 2.0sys 0:10real 20% 0i+0d 690maxrss 0+15pf 141630+314csw