From: Josh Perrymon (perrymonj@networkarmor.com)
Date: Mon Oct 24 2005 - 13:43:44 EDT
I think you could break it out over 4 scanners- use Nmap with something
like- Nmap -T4 -P0
I would use the SQL backend centralized utilizing different scanner IDs.
If it's taking a month to run the scan what about trending?
You need to script as much of this as possible. I would stick with Nmap
for the tool of choice.. You can play around with different flags and
settings to ensure your using the best combination.
Do you have any idea what services should be up if a machine is indeed
available? If so then you could write a script to look for those open
ports before scanning the entire class A with nmap.
Ex- When doing an internal assessment after verifying no devices will
deny ICMP I'll do an nmap -sP and export to a text file. I'll then grep
the results and import that into Nmap and Nessus for scanning to save
time.
But this only works if your 100% sure no devices block ICMP. This could
roll-over into the procedure used to scan the class A.
JP
Network Armor
-----Original Message-----
From: tarunthenut@gmail.com [mailto:tarunthenut@gmail.com]
Sent: Monday, October 24, 2005 8:33 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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