On Tue, 5 Jan 2016 09:09:22 -0500 Alex <mysqlstud...@gmail.com> wrote:
> I agree with what you've said from the perspective of a security
> professional and a "good Internet neighbor". However, we have a
> default-deny policy on our firewall.

That's your decision and there's nothing wrong with it as such.
However, you said:

  "I can't think of any reason a legitimate attempt would be made to
   communicate with that address"

and there are plenty of entirely legitimate reasons for scanning.
There is no reason to be disturbed by scanning per se.

Regardless, if you already have a firewall policy you feel
comfortable with and it blocks everything by default (which is
entirely reasonable), there's no need to use fail2ban to prevent
scanning. The real function of fail2ban is to prevent abuse of ports
that you are leaving open for some good reason (say ssh or smtp
submission).

Perry
-- 
Perry E. Metzger                pe...@piermont.com

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