OpenVPN
Getting Started with OpenVPN on Ubuntu
Installing OpenVPN on Ubuntu Server 12.04 or 14.04 using TUN
Installing OpenVPN on Ubuntu Server 12.04 or 14.04 using TAP
OpenVPN with ID and Password Authentication on Ubuntu
OpenVPN with Two Factor Authentication on Ubuntu
OpenSwan/StrongSwan/IPSEC
Setup L2TP IPSEC VPN on Ubuntu
OpenSwan Error – One Way Traffic with Cisco ASA
StrongSwan Ipsec VPN for Remote Users with Certificate Based Authentication
Peer to Peer Ipsec VPN with Strongswan
