RW wrote:
On Tue, 23 Jun 2009 22:37:12 +0200
Erik Norgaard <> 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

Great: Wouldn't that be the same as monitoring failed login attempts and temporarily blacklisting ips that repeatedly connect through standard methods?

Point remains: Adding port knocking does not solve any security problem, it only adds complexity, cost, points of failure, inconvenience etc while making your problem appear differently and leaving you with the illusion of being more secure.

BR, Erik
Erik Nørgaard
Ph: +34.666334818/+34.915211157        
_______________________________________________ mailing list
To unsubscribe, send any mail to ""

Reply via email to