Re: Nmap as a network mapper

[David Fifield <david () bamsoftware com>]

On Sun, Mar 14, 2010 at 04:20:49PM +0100, mjanmart () student fundp ac be wrote:
> Hello,
>
> I'm a student in computer science in the FUNDP in Belgium. I'm doing a  
> project who monitors the network of a company and shows how much packet 
> they exchange and how long they stay online. Its goal is to show that a 
> lot of people keep their computer up when they're not at work and that 
> it's not eco-friendly. Moreover, the company looses money because of that 
> behaviour.
>
> You're probably wondering why I tell you all that. I have also to make a 
> map of the network of the company to "show" to a "non-computer  
> scientist" a more simple interface like "computer always up are in red, 
> computer always down are in green". I have a virtual lab and I really 
> don't know if/how I can use nmap to map it. I saw Zenmap had an  
> interface that could do such things but it doesn't work when I try to  
> map my local network.
>
> Have you got any hints or links you could send me explaining how a  
> network mapping is performed?

Make sure you use the --traceroute option or else the Topology view
isn't as interesting. Even then, if you are scanning just one subnet the
"map" will be only one-hop connections.

Zenmap doesn't have a display to show "computer always up are in red,
computer always down are in green," but what you can do is do several
scans of the network over time, save the results in XML format, and then
write a program to count how many times each host was up across all
scans.

David Fifield
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