The arptables is a user space tool used to set up and maintain
the tables of ARP rules in the Linux kernel. These rules inspect
the ARP frames which they see. arptables is analogous to the iptables
user space tool, but is less complicated.
Note that it is considered legacy upstream since nftables provides the same
functionality in a much newer code-base. To aid in migration, there is
arptables-nft utility, a drop-in replacement for the legacy one which uses
nftables internally. It is provided by iptables-arptables package.