| Name | Description | 
| AUTH_SYS | Authentication based on traditional UNIX identifiers (UID and GID).
 Server trusts the IDs sent by the client for each request and uses them
 to perform access control. Current implementation only supports
 AUTH_SYS with root user. 
 | 
| SEC_KRB5 | Ensures RPC header authentication using Kerberos session keys. When
 this option is enabled, the client uses the information specified in
 UserInfo to establish shared keys with the server using
 Kerberos. These shared keys are used to generate and verify message
 authentication codes for RPC header of NFS requests and responses,
 respectively. This method does not secure NFS file data. 
 | 
| SEC_KRB5I | Extends SEC_KRB5 to generate and verify message authentication codes
 for the payload of NFS requests and responses respectively. This
 ensures the integrity of the NFS file data.
   
Since vSphere API 6.5 
 |