I would suggest:
1. Using multiple hosts to execute the scan.
2. Try to use appliances or strip the OS down to the bones. Hopefully
you are using Linux?
3. If you can, since this is an external scan, try to collocate with a
datacenter that is physically close and low latency to the targets.
4. Ask superman for help.
Cheers,
Mike
-----Original Message-----
From: tarunthenut@gmail.com [mailto:tarunthenut@gmail.com]
Sent: Monday, October 24, 2005 5:33 AM
To: pen-test@securityfocus.com
Subject: Scanning Class A network
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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