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RE: wide-scan?
From: Dion Stempfley <Dion () riptech com>
Date: Mon, 10 Jun 2002 10:58:39 -0400

I looked at this for a while last year.  After about 3 weeks of banging my
head, I decided that adding an option to nmap was too much of a change to
feel comfortable about the stability and maintainability of the end product.
I wrote a different scanner, stealing heavily from nmap of course:)  

Do you intend to finish the entire block of hosts for a specific port before
moving to another port?  If so, you may need to keep several thousand host
records and results in memory before outputting them.  You would probably
lose the ability to resume a scan, since you don't have any partial output
to recover from.  Maybe a different output format could accommodate the
change to address some of these issues, but I didn't go down that route
originally.  For my scanner, I decided that by changing the output to stream
results instead of reporting by host, I would reduce the overall memory
requirements.  
 
Good luck,

Dion

-----Original Message-----
From: Bradley Kite [mailto:bradley () deathsgate demon co uk]
Sent: Saturday, June 08, 2002 12:44 PM
To: nmap-dev () insecure org
Subject: wide-scan?


Hi everybody.

I'm considering adding a 'wide-scan' option to nmap,
so that instead of scanning all ports on each host,
then moving to the next host (a deep scan) it will
scan port 1 on all hosts, and then move to port 2
(well it will actually move through the user-supplied
port list but you get my meaning...)

I think that it will provide increased paralellism(?)
when scanning a lot of hosts with paranoid (-T) timing options
because while you are waiting, you can scan other hosts.

The down side is that it will require a lot more memory,
but you can get around this by reducing the number of ports
you want to scan.

Comments/Suggestions requested.

Regards
-- 
Bradley.
pgp key: http://www.deathsgate.demon.co.uk/bradley.key.asc




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