Configuring a VPN Using Easy VPN and an IPSec Tunnel [Support] - Cisco Systems
PPTP Remote Access VPN Configuration on Cisco Routers
Site-to-Site IKEv2 IPSec VPN using Pre-Shared Key Authentication - simple configuration example for two Cisco routers - NIL - Network Information Library
vpn configuration lab using routers in cisco packet tracer | Learn Linux CCNA CEH IPv6 Cyber-Security Online