How to confirm how many ports rsh connection uses

Solution Verified - Updated -

Issue

As it's well known that rsh connection uses ports 512,513,514 as below.

rexec 512
rlogin 513
rsh 514

But besides these ports we must permit other ports(512~1023) on firewall otherwise the connection will not success.

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 4

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