All networking is via gigabit ethernet, no (relevant) wifi. I have a pair of PI 2s configured with OSMC, and a pair of PI 1s configured with Raspbian. My distribution is as follows:-
Pair of QNAP NAS serving mostly a couple of laptops from one and mostly media from the other, connected to…
Netgear GS110TP (internet router connects here too)
Netgear GS728TP (WAP connects here too)
one connection goes to Netgear GS105PE and on to a PI (plus DVD player and TV)
One conneection goes to a 2nd GS110TP then on to a Netgear GS108PE and another PI (plus DVD player, amp and TV)
This setup was working faultlessly for about a year, until a few weeks ago.
My primary testing has been with the first pi with only 3 switches to traverse. I have iperf3 loaded on all PIs. I’ve been SSH into a pair of PIs then using iperf3. I have a Raspian PI plugged into the GS110TP closest to thre NAS’, which I’ve been using to initiate tests as e.g. iperf3 -t600 -c192.168.1.180 -u (or without -u). I’ve been swapping back an forth between the “normal” OSMC PI and the other Raspbian PI, and using that as a server with iperf3 -s.
Switches and cabling are therefore the same.
iperf3 is reporting essentially perfect transmission with the Raspian PI, however when I swap to the OSMC PI I’m seeing significant dropped packets.
The actual symptom that kicked this off is KODI replay on the OSMC PI had started fairly regularly stopping and returning to the KODI menu. MKV media on NAS being shared via OS level NFS v3 mount on the OSMC PIs. I was trying to ascertain if the issue was the NAS, the network or the PIs.