Posted: Fri May 29, 2020 22:33 Post subject: General Troubleshooting Tips? Intermittent WiFi Drops
I'm not so much looking for help with my specific hardware/configuration, but more general tips about what to look for and where to look.
That said, in case it makes a difference, I'm using a TP-Link AC1900 and DD-WRT v3.0-r42819 std (03/30/20). I have 50-75 devices attached, mostly very low impact ones like smart plugs, Echo Dots, Ring, etc. Some Rokus and other streaming devices, but it happens when nothing is streaming, too.
I've had this problem for quite a while but it's become more frequent, to the point where it now happens numerous times a day. The WiFi will just stop working (not sure about hardwired--almost everything on my network is WiFi) for a few minutes. Then a few minutes later it comes back online. I haven't found anything helpful in /var/log/messages. The load average is always low (under 0.15).
Where else should I look for any indication of what is happening? Is there any additional logging I can enable?
I've updated to today's release, just in case there are bug fixes from the past month or two that address this.
But I'm not just looking for a fix for this problem. I want to know what I should be looking at to figure out what the problem is.
Also, it's not just a problem with the IoT devices. When it cuts out, everything drops. The Dot's don't respond. If the kids are streaming something in the living room, I hear it stop. The WiFi connection drops on my laptop. As near as I can tell, EVERYTHING loses the connection.
I'm running in "Mixed" Wireless Networking Mode and "WMM Enabled". My IoT devices work fine, other than these times when WiFi drops out (for everyone, not just those devices).
Shouldn't there be some clue in a log file or something that would help me figure out what's happening? Or something I can do to diagnose it?
Well that didn't last long. The changes above made no difference. WiFi is still dropping out regularly.
This time the drop was long enough that I was able to confirm that the one wired desktop in the house was still working, so I'm able to confirm that it's just the WiFi.
I also checked to see which channel was clearest and switched to that channel. It dropped again a little while later. So the channel doesn't matter either.
Looking through /var/log/messages. So far, I don't see anything that might point me in the right direction. With klogd running, the one new thing I'm seeing is some "kern.warn kernel: DROP" records, which I think is just the firewall.
A wild guess: An old TP Link of mine (??1043wrd??)
still is in use at my parents house with 20ish devices connected via wireless.
It suffered from dropouts on wireless, too.
Found nothing in logs but some hints in google: malfunctioning /aged mains adaptor.
Since I exchanged it, no problems anymore
As it looks to me, the wifi chipset ceased to function due to power shortage and often needed a device reboot to be usable again.