It was at this point I realised the igb0 port was not 'assigned' in interfaces - it is just hanging around at the bottom in green as a 'new interface' - assigning it to a Nonsense ID (I used Dummy), not configuring anything at all EXCEPT changing the MTU to 1508 then changes the physical port. On OPNSense (not sure if it is a change or not), when using a PPPoE setup, it creates a WAN interface against pppoe0 (igb0) - the MTU to 1508 in Interfaces > WAN > MTU to 1508 changes the WAN 'interface' to 1508, and the PPPoE point-to-point device to 1500, but does nothing to the physical igb0 port. Notably I don’t see anything on OpnSense logs to indicate why the Netflix streaming issue happens.So I worked this out in the end. This isn’t reproducible on PfSense or Untangle. The issue reverts after a few hours or days. I’ve tried resetting, reinstalling OpnSense. Also Speedtests or latency tests have never shown me anything that is less than very good (gigabit speeds / <15ms latency). My temps, cpu and ram usage also seem fine.

I am running as basic a config as possible with stock firewall rules, almost no plugins except what I’ve mentioned. This often happens 2-3 times repeatedly and stops. Multiple times an hour, my HomeKit cameras and doorbell (which all have static IPs and roaming disabled on wireless) disconnect for a few minutes and reconnect again. This doesn’t affect any other streaming platform. Switching to cellular or another network instantly improves streaming quality. This is while, Netflix’s own Speedtest app shows me gigabit speeds.

Streaming Netflix (only Netflix and no other streaming application) on any device connected to home network, be it over Wi-Fi or Ethernet streams at 720p or lower.

All hardware acceleration is disabled on the system (it doesn’t boot with these enabled anyway). For troubleshooting purposes Suricata is disabled. I’m running a static IP address on WAN, DHCP running on LAN on a /24 private subnet. ISP Line -> OpnSense -> Switch -> ASUS Mesh wireless AP (4 nodes) I’ve tried troubleshooting countlessly for the past month but to no avail. As the title states, I’m facing chronic disconnection issues while running OpnSense on a custom built Ryzen box (Ryzen 2700 with 16GB of RAM and a Intel 4-port PCIe card which is used by OpnSense for WAN and LAN interfaces).

Opnsense speedtest