IPsec configuration starts with navigating to VPN | IPsec. The Tunnels page displays a table of existing IPsec tunnels. Each IPsec tunnel requires a Phase 1 configuration, as well as at least one Phase 2 configuration (you can have more than one Phase 2 configuration corresponding to a single Phase 1 configuration). Click on the Add P1 button to start Phase 1 configuration.
The Phase 1 configuration page has four sections. The first section is General Information, and the first option under this section is the Disabled checkbox; if you check this box, the Phase 1 entry will be disabled, but will remain in the table. The next option, the Key Exchange version drop-down box, allows you to choose between IKEv1 ...