On Tue, 23 Jun 2009 22:37:12 +0200
Erik Norgaard <norga...@locolomo.org> wrote:

> You're right, as long as port-knocking as a first pass authentication 
> scheme is not in wide spread use, then any attackers will not waste
> time port-knocking. If ever port-knocking becomes common, attackers
> will adapt and start knocking.

It would be fairly straightforward to prevent that by having a
combination of knocking ports and secret guard ports. When a guard port
gets hit the sequence is broken, and the source IP gets blocked for a
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