Re: Machines on LAN
On 2007-10-31, Timothy Murphy <tim@xxxxxxxxxxxxxxxxxxxxxx> wrote:
Is there an easy way to determine all the machines
(or other devices) on a LAN?
Define "determine", "machines (or other devices)", and "LAN".
Let's start backwards: officially, the LAN is anything on ethernet that
doesn't go through a router. But some sites have more than one router,
and some people want to know about all the machines at their site.
Do you want to know about machines with a MAC or IP, or *all* devices?
It might not be so easy to determine whether (or where) there are hubs
or switches, nor to determine whether there's a machine connected but
it's not powered on (or its interface is down).
What do you want to know about these machines? IP, MAC, hostname, OS,
other?
Modulo the answers to the above questions, one easy way to report some
machine information is by using nmap on your subnet (if you have
permission to do so). You can nmap anything with an IP address, so you
can cross a router if needed; it's real-time, so if a machine is off at
the time you nmap, you won't find it.
--keith
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