Re: Scanning Class A network

[Matt Bellizzi <matt.bellizzi () nokia com>]

Just an idea

First ping the host to see if it's up with a super fast 1 packet 
ping.    The hosts that respond have them stored into a file and then 
have nmap do a full port scan on those hosts.  I noticed your tried 
deviding the scan up into smaller chucks.   Have you tried running those 
chunks in parallel?   Of course you may have already done all of this 
and it's possible I'm wasting your time.


pen-test-return-1078478378-Matt.Bellizzi=nokia.com () securityfocus 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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