From: Michael Gargiullo (mgargiullo@pvtpt.com)
Date: Tue Oct 25 2005 - 15:27:09 EDT
Think about it for a minute and do the math involved
2 trillion ports to check without a reliable method of identifying live
IP addresses.
The network you're scanning will have changed significantly in the time
it takes to complete the scan. The results will not be reliable at all.
Assuming you could build a cluster to check 100,000 ports per second,
your still talking running 33 weeks straight. Now in reality, it takes
longer then 1 second to check a port, especially if it's live.
Whoever tasked you to do this has no concept.
You could probably pull it off, if you built a huge cluster, and
consumed the majority of their bandwidth (don't forget your also limited
to the amount of outbound traffic your internet connection can handle,
ie... 384k, 768k, 1.5mb, 45mb, etc...)
Now if you could get your contract to say you get paid .1 of a penny per
port... a few months of that and you'd surpass Bill Gates' wealth.
Sorry mate, unless you spread it out over 6 months or a year, it's not
something easily done.
-Mike
-----Original Message-----
From: Mike Jones [mailto:sopiaz57@gmail.com]
Sent: Monday, October 24, 2005 2:39 PM
To: Michael Gargiullo
Cc: pen-test@securityfocus.com
Subject: Re: Scanning Class A network
You may need a bit more than a cluster of 2 386's to scan this many
ports: (tcp and udp)
2,198,989,438,980
Have you looked into the Insane option for nmap using a cluster. (See
http://openmosix.sourceforge.net/)
Sounds like an educational institution, why dont you take over a few
large computer labs and post results.
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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