How to confirm how many ports rsh connection uses
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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