Slow ethernet iperf3 speeds until reboot

  1. When a slowdown occurs, can you run a dd file copy over the network and compare it with the iperf3 speed?

  2. Sorry to be a stickler for detail, but how do you know that the network is slowing down, other than by using iperf3?

  3. Do you have anything else to add re. my write-up?

Edit: I see you’ve answered point 2, but 150 Mbps is way faster than you need for a responsive SSH session.