The command is only available when the TCP/IP protocol stack is installed as part of the network adapter properties in a network connection.
The "arp -s InetAddr EtherAddr [IfaceAddr]" command adds a static item to the ARP cache that resolves IP address InetAddr to physical address EtherAddr. To add a static ARP cache item to a specific interface table, use the IfaceAddr parameter which represents the IP address assigned to that interface.
Common uses include:
-arp -a Ip
-To display ARP cache entries related to a specific interface by specifying its IP address in combination with -a command.
-arp -s Ip physical address
-To add a static item to ARP cache manually. This item will remain valid during system boot or will be updated automatically with manual configuration when an error occurs.