ether (Ethernet) netrom (AMPR NET/ROM)
Usage: rarp -a                               list entries in cache.
       rarp -d <hostname>                    delete entry from cache.
       rarp [<HW>] -s <hostname> <hwaddr>    add entry to cache.
       rarp -f                               add entries from /etc/ethers.
       rarp -V                               display program version.

  <HW>=Use '-H <hw>' to specify hardware address type. Default: ether
  List of possible hardware types (which support ARP):