When using NFS on a Red Hat Enterprise Linux client using autofs, why are there periodic NFSv2/3/4 NULL Call's visible in network captures?

Solution Unverified - Updated -

Issue

  • When using NFS on a Red Hat Enterprise Linux client using autofs, why are there periodic NFSv2/3/4 NULL Call's visible in network captures?
  • NFSv2/3 traffic is visible in a network capture on an NFS client configured only to use NFSv4.
  • autofs is being used on the NFS client.

Environment

  • Red Hat Enterprise Linux
  • autofs

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