**charon-cmd** instead of **charon**). For many options defaults can be
defined in the **libstrongswan** section.
+charon.accept_private_algs = no
+ Deliberately violate the IKE standard's requirement and allow the use of
+ private algorithm identifiers, even if the peer implementation is unknown.
+
charon.accept_unencrypted_mainmode_messages = no
Accept unencrypted ID and HASH payloads in IKEv1 Main Mode.