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Re: Problem with NMap Scans
From: Shaon Diwakar <shaon.diwakar () yahoo com au>
Date: Mon, 28 Jan 2008 15:16:27 -0800 (PST)

Hi whitehat, 

What other options are you using? Are you performing a full port scan (i.e. all 65535 ports) - UDP scan normally take a 
long, long time - but this is because UDP is connectionless. The docs have a very good explanation of why this 
technique takes a long time:
http://nmap.org/man/man-port-scanning-techniques.html

There may also be other non-nmap related issues going on here, for example a FW in between is doing something funny. Do 
you have problems using any other portscanner? 

Cheers,
sHz

----- Original Message ----
From: whitehat <whitehaat () gmail com>
To: pen-test <pen-test () securityfocus com>
Sent: Tuesday, 29 January, 2008 4:22:38 AM
Subject: Problem with NMap Scans

Hi List,

I'm using NMap for port scanning and I never faced any problems.
But  in recent times when I scanned some systems it was showing nearly 
8.00 hrs for SYN Scan and 19.00 hrs for UDP Scan to complete.
I tried with '-T4' option which is aggressive in nature but it is of no use.

Can anybody help what is going on there?????
Because we cannot wait up to 8.00 or 19.00 hrs if the Green Zone timings 
are on.



Thanks in advance!!!!!!!!!!!!!!


Cheers.......... :-)












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