strongSwan is a cross-platform IPSec-based VPN solution that implements the IKEv1 and IKEv2 protocols for key exchange, IPv4 and IPv6 support, and authentication with X.509 certificates. This guide explains how to install strongSwan on CentOS 7. When following this guide, you should replace the domain name `vpn.example.com` with your server's fully-qualified domain name. * Deploy a new CentOS 7 instance with SELinux enabled. You can use any of Vultr's [cloud server types](https://www.vultr.com/)......