IPSEC between F5 and third party device

Not a huge fan of that video series (and of F5 BIG-IP VPN documentation in general), there some errors, weird IP changes and other confusing parts.

I created a interface mode based VPN with a FortiGate as test which worked out fine. I should try with a tunnel based one as in principe the IPSEC part is the same, it is the way how you send traffic to the VPN which is different.