utility that scans lan for client?

perryh at pluto.rain.com perryh at pluto.rain.com
Tue Mar 24 00:49:20 PDT 2009

Mel Flynn <mel.flynn+fbsd.questions at mailing.thruhere.net> wrote:
> On Monday 23 March 2009 19:59:36 John Almberg wrote:
> > What I'm looking for is a utility that can scan a LAN for attached
> > clients... i.e., computers that are attached to the LAN.
> >
> > I have one box (an appliance that I have no access to), that is on
> > the LAN but I don't know what IP address it's using. I'd like to
> > complete my network map, and that is the one empty box on my chart.
> security/nmap
> If the box pings, you can simply scan your LAN like:
> $ nmap -sP

Or, with no ports needed:

$ ping -n -t 5 -i 10

Granted you need to know the broadcast address.  If you know the
interface name, you can get the broadcast address from ifconfig:

$ ping -n -t 5 -i 10 ` ifconfig xl0 | sed -n -e 's/^.* broadcast //p' `

BTW both ping and ifconfig are in /sbin, which is perhaps somewhat
less likely to be in PATH than /bin and /usr/bin.

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