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Solved
dnsmasq failure
I was running V2.5.1.16 and have been for 6+ months no issue. The other night the internet went down and I logged into the Orbi via web and verified the provider issue. While there I noticed the up...
based on same thread and update from reddit;
i upgraded again to 2.6.2.104. Within 4 hours I had two more DNS outages. Same as before, DNS lookups to orbi router timing out. Log into router via telnet, reload the config (I'm not sure if dnsmasq was dead, just started documenting pid after last outage) and it started working again. On the 3rd outage I turned DST off (Advanced->administration->NTP->uncheck DST). I reloaded dnsmasq again (no reboots) and so far I've been good for 4 hours. Hopefully this fixes the issue. 1 hour off doesn't matter too much to me.
You can set custom DNS on the RBR under Advanced tab/Internet.
Be aware there are problems with the user of Traffic Meter.
DNS servers from the ISP are not the issue so setting the router DNS servers to specific ones doesnt help. I would need the ability to change the DHCP DNS server given out so it is not the router/orbi which is causing internet outages when dnsmasq fails to respond to DNS queries.
I'm having this same issue. I'm on the latest firmware (2.7.2.104), and the issue started last week. Every few hours DNS stops working, so I telnet in and see something like this at the bottom of /tmp/dnsmasq.log:
Mar 24 18:12:23 dnsmasq[30353]: overflow: 1 log entries lost
I run "/etc/init.d/dnsmasq restart" and that fixes it, but it's obviously a pain to do that repeatedly. I'm debating adding that command to the crontab so that it auto restarts every hour or so.
I forget when I upgraded to the current firmware, but it definitely wasn't last week as I was out of town when the issues started occuring.
Even you wanted to script from cron, you'd still have to enable telnet periodically as it turns off automatically for me at some time frame.
I wish I found this log before I downgraded so I could compare. I have a decent number of IOT and other systems in the house. When I grep through the dnsmasq log there are a large number of queries going on per minute. I wonder if on the newer code if something causing too many dns queries and Orbi can't handle it?
Sample log entries per minute in dnsmasq.log
root@Orbi-Base:~# grep -c 19:33 dnsmasq.log
570
root@Orbi-Base:~# grep -c 19:34 dnsmasq.log
169
root@Orbi-Base:~# grep -c 19:35 dnsmasq.log
198
root@Orbi-Base:~# grep -c 19:36 dnsmasq.log
449
root@Orbi-Base:~# grep -c 19:37 dnsmasq.log
185
root@Orbi-Base:~# grep -c 19:38 dnsmasq.log
373
root@Orbi-Base:~# grep -c 19:39 dnsmasq.log
181
root@Orbi-Base:~#