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Re: Apparent Bug in Nmap
From: Fyodor <fyodor () insecure org>
Date: Thu, 4 Jun 2009 14:47:01 -0700

On Thu, Jun 04, 2009 at 02:44:43PM -0700, Fyodor wrote:

Hi Stanley.  Whether to consider a host "up" can be a touch policy
decision.  We tend to err on the side of considering hosts up rather
than being too strict about it.  In this case above, Nmap receives a
packet purportedly FROM claiming that it is not reachable.
Well, it was reachable enough that we got a response from that IP, so
we consider it reachable enough to continue scanning.

Now if the unreachable comes from a different IP address than the
target, we treat it differently.

By the way, this whole issue reminds me of this famous Monty Python



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