RE: Nmap scanning speed

["Tony Carter" <tcarter () entrusion com>]

> -----Original Message-----
> From: Trent () yahoo co uk [mailto:Trent () yahoo co uk] 
> Sent: Thursday, November 10, 2005 2:13 PM
> To: pen-test () securityfocus com
> Subject: Nmap scanning speed
>
> I have to scan a large network. is it possible to get good 
> port scanning speed of over 700 ports per second from nmap? 
>
> if so what is the kind of hardware required? hsa 

There are many factors that can affect nmap's speed. Turn name resolution
off while scanning (nmap -n), Tune the IP stack,  use multiple server grade
nics (I like the Intel PCI-X Gig) and split the scans up per interface (nmap
-e). Also depending on your OS, I'd try to bind each nmap process to a
dedicated processor.

If your using Linux, I'd go with a 2.6x kernel as there are a lot of
improvements in SMP and the network stack.

-Tony



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