This entry gives a way to find active computers on a LAN with Linux machine.
We can use nmap port scanning tool for that.

You can install nmap with
yum install nmap
or
apt-get install nmap
Example:
nmap -sP 192.168.200.0/23

searches 192.168.200.x & 192.168.201.x sub networks. And lists active computers.

nmap -v -sP 192.168.200.0/23 gives more verbose.

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