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
Okay, well, that’s a pretty good indication that marud’s guess is right and it’s DNS-related, if you can reach hosts by IP but not by name. Is the laptop Linux?
It is yes, Mint
Okay. It’s going to be a little harder to diagnose it since the problem isn’t immediately visible, but you’ve got all the Linux toolset there, so that’s helpful.
Is the DNS server you’re trying to use from the LAN machines running on the OpenWrt machine, or off somewhere on the Internet?
EDIT: Or on the LAN, I guess.
EDIT2: Oh, you answered that elsewhere.
Have you tried doing a DNS lookup from the router (pinging a host by name, say) when you were having the problems?
If so and it didn’t work, that’d suggest that the problem is the upstream DNS server. If that’s the problem, as IsoKiero suggests, you might set the OpenWrt box to use a different DNS server.
If so, and it worked, that’d suggest that the issue is the OpenWrt host’s DNS server serving names. It sounds like OpenWrt uses dnsmasq by default.
If not…that’d probably be what I’d try next time the issue comes up.