[Liverpool] OpenVPN with p2p traffic?

[Sebastian Arcus]

Maybe a topic to chat about at one of the future meetings. I am looking 
for an open source vpn software which can send vpn traffic between 
clients directly - without all the traffic flowing through the server. 
Ideally the software should:

1. Have a server involved
2. The server is on a static public IP with open port(s) to the internet
3. The server helps clients find each other
4. The server might control the authentication between clients and do 
the initial connection setup
5. But then, the rest of the traffic should flow directly from client to 
client
6. The clients don't need to be on public and/or static IP's, and don't 
need ports open to the internet
7. Both Windows and Linux support is needed at client end. Android and 
iPhones would be a bonus, but not essential.

The idea would be for the bandwidth between clients not to be restricted 
by the speed of the connection of the server to the internet - as the 
bulk of the traffic would be flowing directly from client to client.

This is the model ZeroTier uses - but ZeroTier started as 
semi-opensource and now it has become even more restrictive and unusable 
- they even disallowed commercial usage for self hosted controllers.

I've looked into it but I don't think there is a way to make OpenVPN or 
WireGuard work as per above. They would be my preferred options. FreeLAN 
appears promising, but there seems to be almost no usable documentation.