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What is the risk of turning off mount-rootonly NFS option?

Last Updated:

Applies to

  • ONTAP 9
  • NFSv3


  1. There are no risks, it just increases the allowed source ports range for NFS mount
  2. TR-4067
  • NFS mounts generate a source port on the client.
  • By default, ONTAP sets the range of allowed source ports between 1–1024 (-mount-rootonly).
  • In some cases, this range of port numbers might not be large enough to accommodate the number of clients that are mounting.
  • If more source port numbers are needed, set -mount-rootonly to Disabled and modify the firewall rules to accommodate that change.
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