a small doubt

Hi Sandeep,

> I am trying to find out a list of all FTP servers on my college LAN using
> this command:-
> $ nmap -n -P0 -p 21 -oG ftpLog.gnmap -iL IPs.txt
>
> It returns 110 results. But when I remove -P0 option, it returns only 84
> results. Why? Am I doing something wrong?

When you use the -P0 option Nmap does not send *Ping Probes* to the
hosts. However without the -P0 option, it does so, and you get lesser
number of results in the second case because some some hosts have
their firewalls configured to block *Ping Probes*

Hope that helps!

Cheers!

--
Amit Kumar Saha
GSM :+91 9903140286
http://amitsaha.in.googlepages.com
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