In addition to being the
Address Resolution Protocol, there is a
UNIX command called
arp. It helps to find duplicated
IP addresses and
MAC identities.
> arp -a
mother (192.168.0.2) at 0:0:e0:c2:1:ad permanent
titan (192.168.0.5) at 0:0:c2:ae:4:12
arista (192.168.0.4) at 0:0:2:23:a1:ad
rooter (192.168.0.1) at 0:0:ae:f2:aa:1 permanent
>
Typing in arp -a gives you the IP addresses and MAC IDs for each host on the network. The first item is the name, the second item is the IP address, the third item is the MAC, and any additional notes are appended thereafter. There are two permanent devices installed on the network, and are static in the arp table until manually deleted using the arp -d command. To add a permanent entry, use the arp -s command.