services.strongswan-swanctl.swanctl.connections.<name>.version

IKE major version to use for connection.

• 1 uses IKEv1 aka ISAKMP,
• 2 uses IKEv2.
• A connection using the default of 0 accepts both IKEv1 and IKEv2 as responder, and initiates the connection actively with IKEv2.

StrongSwan default: 0