I have NetGear R7800 router running OpenWRT 21.02, configured with WAN PPPoE interface.
Between the ISP and R7800 router, there is Vodafone Gigabox configured in bridge mode. I need this device because it serves as external modem (VDSL2) for R7800, which does not have integrated DSL modem.
Basically this is my setup:
R7800 (OpenWRT) <--> Vodafone Gigabox (bridge mode) <--> ISP
The issue is that every ~60seconds the traffic is being dropped for about 4-5 seconds. Here is the screenshot from my Android phone:
When using Vodafone Gigabox in a standard mode, the internet connectivity works just fine and such anomaly is not present, therefore I assume this is a bug within OpenWRT.
No logs regarding disconnects/reconnects, PPPoE uptime is fine (today morning it was 12h+) and I tried dozen of different settings and I have no clue what might be causing this. Any suggestions?