How to find mac address of a machine in my network

Question

At work, we have a network with internal ip addresses given to machines.

Question: How can I find MAC address of machines in my network whose IP address is known to me.

Also how to find mac address of my router whose ip address I know.

I work on ubuntu.

Answer 1

Erm, arping isn't needed. You can just use arp.

arp <ipaddress>

same thing with your gateway. netstat -rn to find your gateway then arp <ipaddress>, use arp -i <device> <ipaddress> if you want to force a specific interface.

you probably also want to use the -c 4 arguments if you decide to use arping.

After all is said and done you can simply type arp -a to get your current ARP table. another reason arping isn't ideal is that it's not installed by default on many systems.

Answer 2

Use arping as superuser:

sudo arping -I<interface> <IP>