Re: a basic nmap usage question

[Gutek <ange.gutek () gmail com>]

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The option --max-retries 0 does what you want. The Ref Manual (Ch.
Timing  & Perfomances, http://nmap.org/book/man-performance.html) states
that :

"--max-retries <numtries> (Specify the maximum number of port scan probe
retransmissions)

When Nmap receives no response to a port scan probe, it could mean the
port is filtered. (...). So Nmap tries again by retransmitting the
initial probe. (...)
 You can even specify --max-retries 0 to prevent any retransmissions,
though that is only recommended for situations such as informal surveys
where occasional missed ports and hosts are acceptable.

(...)

"

However, your best bet is to consider using Nping instead for this kind
of task / analysis ( http://nmap.org/nping/man.html ), as it was
developed for this very purpose.

A.G.
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