However if you are referring to packet sniffers there is no solid way of blocking them.

On Sun, Jun 21, 2009 at 3:49 AM, Joseph L. Casale <JCasale@activenetwerx.com> wrote:
>In other words, anyone hitting those ports that are not being used at all
>except by our sniff protector, would allow instant banning.
>
>So...does something like this exist?

I don't know of a program that specifically listens to defined ports and
acts on that, but fail2ban would accomplish the end result adequately.

jlc
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