In Data ONTAP, the default NFS user for anonymous access is 'pcuser' (UID 65534) . You can change this behaviour by adding an entry to /etc/exports like "anon=<uid>". Please see the extract from man page.(man exports)
Specifies the effective user ID (or name) of all anonymous
or root NFS client users that access the file system path.
An anonymous NFS client user is an NFS client user that
does not provide valid NFS credentials; a root NFS client
user is an NFS client user with a user ID of 0. Data
ONTAP determines a user's file access permissions by
checking the user's effective user ID against the NFS
server's /etc/passwd file. By default, the effective user
ID of all anonymous and root NFS client users is 65534.
To disable root access by anonymous and root NFS client
users, set the anon option to 65535. To grant root user
access to all anonymous and root NFS client users, set the
anon option to 0.
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