Kerberos authentication uses a unique identifier called a machine principal to
identify hosts. The machine principal is established when configuring a host into
a Kerberos realm. The machine principal name is the fully qualified host name
prefixed with host/ (for example, host/nfs402.itsc.austin.ibm.com).
Another way that Kerberos indirectly identifies a host is through the NFS
service
principal
. (This is the identification of the NFS service running on the host.) The
service principal name is the fully qualified host name prefixed with nfs/ (as in
nfs/nfs402.itsc.austin.ibm.com). NFS clients using Kerberos authentication
identify NFS servers with this service principal.
3.6 NFS V4 host ...
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