OpenVPN behind Fritz!Box

[Chrissilot]

Hi folks, my setup is as follows: ->Internet -> Fritz!Box -> Opensense

Opensense is running well. Now I want to add an OpenVPN Access to the firewall. To access my home network I need a static IP through my STRATO DynDNS-Service. The Fritz!Box already has a staticIP through MyFritz.

Question: how should I configure the FritzBox and the Opensense to access through my static IP? Tried to configure DDNS service in the firewall already, but did not work. Can someone guide me through the process?

Thanks so much.
Christian

[Chrissilot]

Some additional thoughts:
Would you recommend to let the FRITZ!Box handle the VPN-Tunnel or the Opensense Firewall itself? In this case the Firewall needs to handle the DNS service additionally besides the VPN access.

Please, any advice or further help is very appreciated! Thanks.