Hello,
I have a Raspberry Pi with a Huawei LTE USB stick. It runs OpenWRT and works very well as a WWAN router.
My primary home network is connected to a cable internet connection and I can access all systems via Wireguard when I'm remote.
Now I would like to integrate this device into my home network to have a "backdoor access point" in case my cable internet connection fails (which happens frequently). I could then use the Pi as a jump host to connect to the modem, router, server etc. via SSH and solve the problem remotely.
Since my data plan is limited to 200MB per month, I would like to integrate the Raspberry into the network as an OpenWRT client and only run a tailscale connection via the LTE stick. The cable connection should be used for normal traffic (something like ntp...). Is such a configuration possible with OpenWRT? If so, how?