What VPN configuration do I need to connect an AWS VPC to a VPN using strongSWAN?

I need to connect the system I’m helping develop that’s deployed on AWS to another system through a VPN. Looking at the remote system VPN configuration I saw that it is based on a linux machine running strongSWAN. The authentication is done through pre-shared keys.
Both systems need to exchange information but I don’t know exactly at which rate.

Given this scenario, would it make sense to use the AWS VPN managed solution? Unless I missed something, it seems I should be able to connect the two of them through static routing.
But according to the AWS documentation, the communication needs to be started from the other system, as the VPG cannot open the connection by itself. Which leaves me to implement a ping mechanism that would always depend on the other system starting a new connection whenever the previous one is broken. And I don’t have access to the other system so I cannot create this mechanism.

Would it make more sense in this case to go the same route as the other system and just deploy a software VPN on an EC2 instance (or on many for high availability), strongSWAN or another?

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Author: Juan Vega