Re: nmap input list

[David Fifield <david () bamsoftware com>]

On Tue, Dec 06, 2011 at 04:44:18PM -0600, Daniel Garcia wrote:
> Hello,
>
> I executed nmap with a list of IPs as follows
>
> nmap -sn -n -PE -iL input.txt -oX output.txt
>
> The input file is one IPv4 address per line (in no particular order). I
> from the 189 IPs, 7 return back no output in the XML. They appear to be
> down. I can ping them using ping and also via nmap:
>
> nmap -sn -n -PE -oX output.txt x.x.x.x
>
> the "down" ips. If I sort the input list (unix command line sort)
>
> cat input.txt | sort > input2.txt
>
> and reissue the nmap command:
>
> nmap -sn -n -PE -iL input2.txt -oX output.txt
>
> All 189 IPs are up. Is there some undocumented behaviour related to the
> input list?

No, it probably just means that unpredictable network conditions
prevented a few of the probes from being replied to the first time.
Sorting the list probably had no effect, and it was just the same as
trying the original list a second time. However, if you can make this
happen consistently, please let us know.

David Fifield
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