we had a power outage and suddenly my router (r7800) wouldn't connect to the modem anymore.
I've reset the modem to router mode and also installed the latest OpenWrt firmware from hnyman on my R7800. Everything is vanilla/untouched and it's working fine so far.
I always had my modem in bridge mode to avoid problems because I was using dnsmasq etc. to have better privacy.
Now after switching the modem to bridge mode, the internet connection drops. When I am connecting directly to the modem via LAN from my PC, internet is available.
I've already added a new interface "modem" following the steps here: https://ciphermenial.github.io/access-your-modem-through-openwrt-router/
After that I have access to the menu of the modem via 192.168.100.1 (this is the default address after switching to bridge mode).
I am sure I have somehow to tell OpenWrt that there is a bridged modem but I've forgotten how I have done it last year and can't figure it out. I have no idea why the connection failed after the power outage. ...seems that the modem got a new IP/Gateway and the router couldn't connect anymore.
Please help, I know there is someone out there that know how it is done.
As said I am sure I have to change the interface somehow and add a firewall rule.
The WAN and WAN6 interface are in "DHCP Client"-Mode, I think that needs to be changed...
Any help is much appreciated.