From: Chris Byrd (cbyrd01@gmail.com)
Date: Mon Oct 24 2005 - 14:46:04 EDT
What you probably want is scanrand, a component of Paketto Keiretsu
(http://www.doxpara.com).
Scanrand is a stateless TCP scanner that splits the functions of
sending probes and receiving replies using a technique the author
calls SYN cookies to verify the results. By doing this, it can scan
with incredibly fast (nearly wirespeed at 10Mb) results. I've used it
to scan class C networks in seconds. You can then feed the results to
a more feature-complete scanner like nmap for service and host
identification, etc.
Best of luck to you.
- Chris
On 24 Oct 2005 12:33:05 -0000, tarunthenut@gmail.com
<tarunthenut@gmail.com> wrote:
> Hello All,
> Recently I was given a task to carry out a port scan of an entire valid
> Class A range (Dont ask me what the huge pool of valid IP's was for :) ).
> The scan needed to be carried out externally, and not from within the
> network to identify hosts and ports exposed to the Internet.
> The problem compounded cause of the following limitations :
> 1. ICMP was not allowed in the network
> 2. The IP range was to be scanned every month for the entire port range fro=
> m
> 1-65535 for TCP & UDP
> After searching for a suitable scanner which could scan such a large range
> in reasonable time, I could think of only nmap, nessus, superscan and ISS.
> But because of the limitations stated above,all the tools took a huge
> amount of time (ran into month).
> I have struggled with options within the tools, tried configurable
> parameters (host time out, parallelism, RTT etc) and divided into smaller
> class C networks and scanned.but still the scan seems to take ages even if
> it is
> Any advise would be welcome :)
>
> Cheers
> tarunthenut
>
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