I have been seeing periodic drops in internet access from LAN connected devices lately (last 2 months), and I haven’t been able to figure about exactly what is going on. There doesn’t seem to be a pattern, and it resolves itself after a few hours.
- I can access the internet from my router
- All devices on LAN can reach each other, both wired and WiFi
- All devices on LAN can reach router, both wired and WiFi
- I haven’t changed anything in router settings
- I haven’t added new devices to my local network
- I can’t find any IP conflicts
- It’s a simple flat network with two APs, a single switch, no VLAN separation
Sounds to me like your DNS on the router itself is crashing.
There’s a couple of things you could do. Set up something like pihole or adguard home, and set the forwarding to something other than your internal DNS server.
Personally, I use AGH, and the default quad9 for forwarding all but my own domains. Those get handled by my OPNsense router’s Unbound DNS and/or DNSMasq, depending on which domain (local or one of owned domains)
Everything other than those gets forwarded to quad9’s public DoH service.