I am using Ubuntu 14.10 and I need to create a VPN L2TP connection.
I installed strongswan, as suggested by this answer, but now I don't understand how to configure the connection.
The connection data I have available are an Ip address, a username, a password and a preshared key.
I try to create the connection using the network manager, but I don't understard which option I have to select. First thing: do I have to create an ipsec/ikev2 or a pptp vpn? Which authentication protocol do I have to select? Where do I insert my preshared key?
Any help is appreciated