With the new isolation and enforced WFH regime, I've been looking into my home network setup to iron out some problems. I'm frequently finding my download speed dropping to below 2Mbit/sec at the same time as ping responses jump from around 10ms to well into the hundreds.
I set up a Smokeping server (wired) to ping several internal connections as well as external. I'm finding multiple times a day the external pings are spiking to up to 300ms and dropping up to 50% of packets. During these times it is, of course, extremely hard to follow video conference calls. Frustrating as I'm on 350Mbit service.
I haven't managed to correlate the ping drops/spikes with Speedtest results, but I'm also showing dramatic speed drops, but normally only for the download. Upload remains relatively stable at 36Mbit, but the download drops through the floor to less that 2Mbit/sec (regularly down below 0.1Mbit when I test when I've been disconnected from work Skype calls).
Not sure where to start on diagnosing further, but I also ping test the Modem and find that around half the time it doesn't return pings AT ALL! Not expecting that. Very occasionally it starts behaving for a while. Last time this happened I managed a whole 4 hours of ~2ms ping responses before it started playing up and dropping 90+% of packets.
Everything else internal behaves as expected with pings. Modem is in modem mode. Cat6A to a Turris Omnia Router. Cat 6A to a Netgear Gigabit switch. Linksys Velop system connected to this switch via Cat6A (although I don't trust it, so exclude any wireless connections from my monitoring/testing). I've replaced multiple cables and even swapped over the Netgear switch.
Am at a loss. Any help gratefully received. It's driving me crazy trying to work from home with a service like this. Unsure if it's related, but my V6 box also struggles to display any HD channel from 5HD onwards without blocking. Minor inconvenience as we use FreeSat HD channels unless we need to record to the V6 box.