Symptom:
2019-08-12 11:02:23 notice netifd[]: Network device 'eth1' link is down
2019-08-12 11:02:23 notice netifd[]: Network alias 'eth1' link is down
2019-08-12 11:02:23 notice netifd[]: Interface 'wan6' has link connectivity loss
2019-08-12 11:02:23 notice netifd[]: Interface 'wan' has link connectivity loss
2019-08-12 11:02:23 info kernel[]: [83182.319922] mvneta f1034000.ethernet eth1: Link is Down
2019-08-12 11:02:48 notice netifd[]: Network device 'eth1' link is up
2019-08-12 11:02:48 notice netifd[]: Network alias 'eth1' link is up
2019-08-12 11:02:48 notice netifd[]: Interface 'wan6' has link connectivity
2019-08-12 11:02:48 notice netifd[]: Interface 'wan' has link connectivity
2019-08-12 11:02:48 info kernel[]: [83207.314906] mvneta f1034000.ethernet eth1: Link is Up - 100Mbps/Full - flow control off
I occasionally had these for quite a long time, but now it’s at a rate of about 300/day, which is very annoying (it’s long enough to break video streams, for example). WAN is connected to an ISP box which I can’t directly affect (it’s even shared with other customers).
Do you have any idea how to debug this – narrow where’s the problem? Backup plan: temporarily revert to a cheap router and monitor by a continuous ping from a device inside.
The significant worsening correlated time-wise with an update (3.11.6 rc4 -> rc5), but reverting to stable (incl. reboot) didn’t seem to affect that, so I assume it was unrelated. The ISP box is a probable suspect, but I want to build a bit more confidence/evidence before reaching out to their support