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network discovery

JeffBeall asked
Last Modified: 2012-05-08
I need to re-structure my network from a 192.168.1.X scheme to 172.16.25.X. What is the best way, or software I could use to pole my network to discover all the current IP addresses that are used?
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Nmap - using a few options with it will help determine the device type as well.

Download from http://insecure.org

The winodws version has a gui, although if you use the command line, the syntax would
Be nmap -sS -sV -O

Hope this helps


does nmap just come with linux? i dual boot, and if it does, i'll just use linux.
As far as I'm aware, it's not installed by default, but it's in the repositories for Debian, Fedora and Ubuntu (not sure about others but I would imagine it would be).  The only distro I know of that it's in by default is Backtrack.

Just apt-get install nmap or yum install nmap.  If you have a lot of hosts and use the above command, output to a text file though as this will give you a lot of output about hosts....

You might also want to disable ping checking if hosts have ICMP traffic disallowed (add the -PN option) so it reads:

nmap -sS -sV -PN -O > nmap.txt


is there a way to use nmap just to discover network devices on the network. i dont care about opened ports, just if something is at for instance?
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that worked just like i hoped it will. Thanks for the help.

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