IPsec Site-to-Site VPN between Cisco ASA and Ubuntu 14.04 (Using Digital Certificates) – Part 2 - Intense School | Digital certificate, Digital, School
IPSec Site to Site VPN Between MikroTik and Cisco Router
Cisco ASA Site-to-Site IKEv1 IPsec VPN
Site-to-Site IKEv2 Tunnel between ASA and Router Configuration Examples - Cisco