This is my setup
OpenWrt 18.06 on Raspberry Pi 3B.
Default installation plus Adblock and fail2ban.
On the lan I have couple RPi’s dedicated for its task (web server, Vpn, Domoticz, 3cx pbx, syslog).
Everything was working fine for few month since I switch from Cisco ASA to OpenWrt.
This morning all devices on the Lan lost connection with internet. No I didn’t make any changes last night.
Disabling Adblock didn’t help.
I thought it was dns, tried typing known IP address into web browser and it didn’t connect.
However my web server was accessible from outside.
I could connect from outside to VPN and ssh into any server, but web access didn’t work
Also diagnostics from openwrt (ping, traceroute all worked)
Update: loaded a month old backup and everything is back to normal.
Any idea what could have caused it. Are there any logs besides system and kernel log