Eric Whitehill wrote:
> Basically I'm trying to figure out how Nessus determines a host is 'alive' 
> and then if it is alive, how does it determine if a port is open or not. 
> 
> It's not for me, it's for a vendor that is being rather 'difficult'.  
> 

You might look in Chris McNab's book "Network Security Assessment" (O'Reilly). 
Chapter 4, "IP Network Scanning", probably has what you want to know.

BobS

Oh, I have absolutely no connection with O'Reilly.  I just own a copy.
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