Ways to control ports in AEBS

I know this topic has been visited many times but I have not found an answer to my question.
Other than port forwarding, is there a way to control ports on an AEBS? Specifically switching a port from closed to stealth?
I know that NAT protects the computer. I am not suffering from "Ping Paranoia"
The reason I ask the question is when I performed a port scan I found most ports closed, none open, but a few were stealth. I am trying to learn why this is the case and how this operates 'in' the AEBS. Thank you kindly.

Although not documented, I believe (from reports on this topic by others that the Airport Extreme Base Station does not "stealth" any of its ports. A port scan will simply indicate they are "closed". There is no ability to change ports from "closed" to "stealth" on an Airport Base Station individually or altogether.

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