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Re:use of UDP

Posted by: Anonymous Coward on August 12, 2004 01:49 AM
>I thought that the main point of port knocking is
to not reveal whether the machine is switched on

That's impossible.

As I detailed in another post, you can't do port knocking with UDP, because you have no guarantee that the server will receive the same sequence of packets you are sending.

On the other way, establishing a TCP connection requires that source and destination "shake hands" -- that is, destination must respond to you before you can even start sending data.


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