Configuring L2TP/IPsec Server using PSK | Clavister Knowledge Base
IPsec ( Internet Protocol Security) | by Kaviyarasu | Medium
Site-to-Site IKEv2 IPSec VPN using Pre-Shared Key Authentication - simple configuration example for two Cisco routers - NIL - Network Information Library
Considerations about IPsec Pre-Shared Keys | Weberblog.net
VPN Password Generator
September 2006 – Karstens Cyber-Fi Blog
GitHub - kravietz/ansible-ipsec: IPSec configuration generator for Ansible
IPsec (Internet Protocol Security)
networking - Where to add the Pre-Shared Key for the Server Authentication with Network Manager for L2TP/IPSEC? - Ask Ubuntu