RT-AC66U WAN connection freezing/dropping

[damccull]

I have an RT-AC66U. Several times per hour I experience an internet connection drop. My internal network still functions as advertised, but I lose all connections for every device trying to access anything on the WAN.

I have run a continuous ping from my laptop (wifi connection), from my desktop (wired connection) and from the router itself via SSH. I have no problems accessing the router via SSH or web page during this time, and no problems pinging other devices on my network, both wired and wireless.

When I plug my laptop directly into the internet connection I do not experience any connection loss over many hours of time.

Is there a way that I can watch the WAN in logs or something and see if there's any errors or something crashing? It seems to recover between 30 seconds and several minutes after it dies. I'd like to fix this issue. I'm running ASUSWRT-merlin 376.49_4. This has happened on at least the previous 4 versions for me. I am hoping it's just a configuration issue that can be easily solved.

Thanks,
damccull

 

[RMerlin]

Check the System Log at around the time of a disconnect.

 

[damccull]

Check the System Log at around the time of a disconnect.

I don't see anything in the logs indicative of a connection drop. That's what's weird. This gist (https://gist.github.com/damccull/660a6b0f0cf4f98d1ea8) has my syslog and a log of timestamped pings during two disconnects. The pings just start timing out (from the router via ssh as well) but I see no correlation in the syslogs.

damccull

 

[RMerlin]

That line:

Dec 27 22:19:06 WAN Connection: Ethernet link down.

Indicates that the Ethernet link physically went down between the router and the modem. Most likely cause is your modem rebooted itself.

 

[damccull]

Ok, so I missed that part, but the timestamp doesn't correlate with the several times that my ping starts to fail. Also, while watching the log live with "tail -f /tmp/syslog.log" nothing appears in the log when the internet drops and returns.

Lastly, I'm not plugged into a cable modem. I have fiber to the house and the router is plugged directly into the wall which is run to the fiber outlet on the side of the house. I assume there's a fiber modem there. When I plug my computer directly into the wall connection (no router in between) I don't have any of these issues at all.

This all leads me to believe it's a problem with my router, or with a configuration or something. Am I 'doing it wrong'? Thanks a lot for your help, and for the sweet firmware.

damccull