Re: Scanning Class A network

["Satanic.Brain" <Satanic.brain () gmail com>]

Well, if ICMP isn´t allowed in the network your best choice will be a 
"TCP Ping" (-PT nmap argument. Send TCP ACK, and wait for  RST).

About point 2, i recommend you Nmap... you can save the output and then, 
with a little perl script,  compare the results with a "diff" sentence...

I´m suposing that you are working in a Linux environment, cause Nmap in 
windows will be very slow (for that type of scans)

Sorry my poor english, but isn´t my first language..

Cheers

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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