Try this. It keeps the disks out the picture..
Code: Select all
receiver$ netcat -l 1234 >/dev/null
sender$ dd if=/dev/zero bs=1M count=256 | pv | netcat -q 0 receiver 1234
..should get >10MiB/s else..
pi3b$ sudo arp-scan -I eth0 -l
..(or wlan0) and look for ip address collisions.