[strongSwan] Setup site-to-site VPN via central server

[Martin Sand]

Thanks a lot, Tobias! Really appreciated.

> I've added some documentation [1].
I read through the hub-and-spoke setup on the internet. Is my setup 
actually a hub-and-spoke type? I connect from the gateways directly to 
the internet and only the traffic to 192.68.0.0/16 is routed through 
VPN. Also the text in [1] mentions A-C whereas the diagram shows A-D. Is 
this on purpose?

>> Out of curiosity, how would you configure the server and client if I
>> would like to add vpn-third subnet with 192.168.3.0?
> You'd just add that subnet to the list of remote traffic selectors on
> the clients and as local traffic selector on the server and the client
So this would (or could) result in the following traffic selectors?

## IPs:
Server IP = 192.168.0.1
First GW = 192.168.1.0/24
Second GW = 192.168.2.0/24
Third GW = 192.168.3.0/24

## Server.conf
conn vpn-first
         rightsubnet = 192.168.1.0/24
         leftsubnet = 192.168.0.0/16

## First-Gateway.conf
conn vpn-first
         rightsubnet = 192.168.0.0/16
         leftsubnet = 192.168.1.0/24

Best regards
Martin

[1]https://wiki.strongswan.org/projects/strongswan/wiki/SubnetsBehindMoreThanTwoGateways

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