TR: Mapping Class A network ( any easy trick?)

[Bénoni MARTIN <Benoni.MARTIN () libertis ga>]

I worked in a finantial institution where I had around 65 000 000 of potential IP adresses. I mean "potential" IP 
adresses: many of them where empty, others with just a couple of machines, and very few had all the IP adresses given 
to physical machines.

To scan this (there wer actually just classes C), it took me 5 days & nights for covering all the IP adresses, and we 
were just nmaping (simple nmap -sS) all of these IP adresses.

Just notice that this tuming depends a lot on the traffic on your subnets: the more traffic there is, the slower will 
be your scans ... ;)

-----Message d'origine-----
De : Tim [mailto:tim-pentest () sentinelchicken org]
Envoyé : jeudi 10 février 2005 03:38
À : Moonen, Ralph
Cc : pen-test () securityfocus com
Objet : Re: Mapping Class A network ( any easy trick?)

> Apart from the timing issues (I agree totally) I still think that you 
> cannot call nmap+nbtstat or nmap+nessus or whatever combinatioin 
> 'penetration testing'. To me that is Vulnerability Analysis. VA on a 
> class A is tricky enough. Pentesting (ie attempted exploitation of all 
> discovered vulenrabilities) on a full class A is extremely difficult.
> Impossible for 1 man and his laptop, given average population of 
> networks.

Of course not.  I was merely trying to provide some information on what it takes to actually scan that many IPs.  Our 
scan only consisted of OS fingerprinting, about 20 TCP and 20 UDP ports scanned, and a quick nbtscan query.  This would 
be enough information to map a network where one truly doesn't know what is out there, but by no means is it a 
"penetration test".  Just the first step (in some situations).

tim