Wireguard hotspot

What you want is basically the WireGuard Road Warrior Configuration with a minor modification because the peer that sits on your home network is not actually on the main router (see this thread for the relevant change).

I'm guessing that you must be running an old version of OpenWrt (likely <=18.06) Be aware that anything earlier than 22.03 is EOL and unusupported. There are many serious security vulnerabilities in versions 19.07 and earlier and those devices should not be used on the internet. You should serioulsy consider getting a newer travel router that has appropriate resources to run the latest versions of OpenWrt.

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