Using IKEv1 with Zyxel USG Flex Firewalls While IKEv1 VPN support is still available on older Zyxel firewall models, it's recommended that for new connections, users opt for the more modern IKEv2 protocol for better performance and security. Your next steps: Check you have the latest firmware version installed for…

Explore the full Feature Set of VPN Tracker with a free Trial plan.