Set up a VPN IKE client (Linux)
The easy way is using charon-cmd, this is a command-line program for setting up IPsec VPN connections that are using IKE.
First, in your Linux distribution, install the package charon-cmd 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 <C-c>.