Thanks a lot Eric for your clear and detailed answer.
If I follow you correctly the recommanded steps would be :
- Keep my ISP router as my primary WIFI and Ethernet connection (I have no doubt regarding it)
- Add a GL iNet router as a part of my home LAN via ethernet connection
- Give the GL iNet router a static IP on my LAN, let say 192.168.1.50
- Configure the GL iNet router to work as VPN Appliance only (disable wifi) and set up OpenVPN server on it
- On my ISP router redirect all incoming traffic from a chosen port (let say 12345) to the GL iNet router
- On the mobile GL-MT1300 router I will set up the VPN Client to connect to my.home.external.ip:12345
If I understand correctly when the GL-MT1300 router will have established a VPN connection to my home network, it will be like it’s a part of my home LAN network. Does it means that the GL-MT1300 will obtain a new IP in my LAN network (i.e. 192.168.1.60) or will it share the same as the home GL iNet router (192.168.1.50 in the example) ?
Also I think I will have to test and fine tune but I guess it means that the private wifi provided by the GL-MT1300 (on which I will connect my laptop while traveling) will have to use a different subnet that the one of my home network (i.e. 192.168.5.0/24) to avoid conflicts, right ?
I will have a look tomorrow to find the router with the best specs for this use case.
Thanks again for your anwser 