Ok, this one is not really purely openHAB related. But over christmas I installed a remote openHAB on my mountain Cottage. Unfortunately, the mobile internet connection doesn’t allow for a public IP-adress, but a private (carrier) IP-adress. So I couldn’t establish the VPN as planned from my home to the remote FritzBox! - which I learned only later after being home again.
So - this weekend I’m again at the cottage and just to be sure: I have a public IP-address at my home FritzBox, so if I establish a (permanently then) VPN between the Cottage Fritzbox an my home Fritzbox - this should work, right?
https://en.avm.de/service/fritzbox/fritzbox-7390/knowledge-base/publication/show/5_Setting-up-a-VPN-connection-between-two-FRITZ-Box-networks/ says this:
Requirements / Restrictions
At least one of the two FRITZ!Boxes must obtain a public IPv4 address from the internet service provider.
So, the Fritzbox on a private IP-address can indeed establish the VPN to my Fritzbox at home. I have to test, if this one is stable - as the LTE is not really fast up there… But basically this one should work? or do I have to configure something beforehand?