How to find IP address of a machine on network?

[Matthew Flaschen]

Derek Broughton wrote:
> Matthew Flaschen wrote:
> 
>> Thomas Kaiser wrote:
>>> You can use nmap in a terminal to scan the network for open ports.
>>>
>>> thomas at AMD64:~$ nmap 192.168.0.*
>> Port-scanning doesn't tell him which computer has which IP, only that
>> there are several computers, each with /an/ IP.  He said, "there are a
>> few devices which get their address by DHCP".
> 
> I'm not seeing the difference here - nmap certainly shows all the computers 
> on my local network, with names (if we know them) and IPs - and all of them 
> got their address by DHCP, so why do you think it won't tell which computer 
> has which IP?

If it says:

Interesting ports on 192.168.0.11:
Not shown: 1712 filtered ports
PORT    STATE SERVICE
80/tcp  open  http
443/tcp open  https

Interesting ports on 192.168.0.17:
Not shown: 1712 filtered ports
PORT    STATE SERVICE
80/tcp  open  http
443/tcp open  https

how does that allow him to figure out which computer is which?

Matt Flaschen