Linux

In this guide we will use charon-cmd, this is a command-line program for setting up IPsec VPN connections that are using IKEv2.

First, in your Linux distribution, it has named charon-cmd

 and libcharon-extra-plugins

Second, import the certificate from the server.

Finally, just issue the following command

$ sudo charon-cmd --cert /path/to/the/cert/ca.crt --host vpn.ircnow.org --identity <username>

When the connection is starting it will require your user's password. Press <Enter>.

Now you are connected

To disconnect from the server, just press <ctrl-c>.