arp - How to use arp command in Linux

# man arp

MODES
       arp  with  no  mode  specifier  will print the current content of the table.

       arp -d address will delete a ARP table entry. Root or netadmin privilege is required to do this. 

       arp  -s address hw_addr is used to set up a new table entry. 

arp -n
arp -an