merits of portknocking (was: More SSH 'trolling')

[Lew Bloch]

Responding to:
> From what I've read, portknocking is useless, 
> worse than useless, really, since it induces an entirely unjustified 
> sense of security.  I will never use it.

Alexander Dalloz presented the cogent points:
> I must say that I do not understand that argument. It would be same as
> saying: SSH is useless, because it's enryption of the transfered
> information induces a sense of security, while it does not protect
> against the usage of secure passwords. If you misinterpret portknocking
> claim to be the ultimate security solution you are on the wrong path.
> Nobody ever said something like that

Consider the arguments at
http://software.newsforge.com/software/04/08/02/1954253.shtml
, which presents the case better than I can, as well as hinting at 
alternatives.