What network ports are used by CUPS for printing in RHEL

Solution Verified - Updated -

Issue

  • I would like to know all the ports used for printing so I can configure router to prioritize the printing traffic from all of our Linux server using lpd, 9100 and cups traffic.
  • Could you tell me how to check the port numbers used in the CUPS print process?

Environment

  • Red Hat Enterprise Linux (RHEL)
  • Common Unix Printing System (CUPS)

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