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When a slowdown occurs, can you run a dd file copy over the network and compare it with the iperf3 speed?
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Sorry to be a stickler for detail, but how do you know that the network is slowing down, other than by using iperf3?
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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.