Script for automatic configuration of IPsec/L2TP VPN server on CentOS/RHEL 6 & 7 64-bit.
Works on dedicated servers or any KVM- or XEN-based Virtual Private Server (VPS).
It can also be used as the Amazon EC2 "user-data" with the official CentOS 7 AMI. Note that the official CentOS 6 AMI does NOT come with cloud-init, so you need to run this script manually after instance creation.
Alternative VPN script for Ubuntu/Debian
Original post by Thomas Sarlandie