$ doas rcctl enable dhcpd
    $ doas rcctl set dhcpd flags em1
    /etc/dhcpd.conf
    subnet 38.87.162.0 netmask 255.255.255.0 {
            option routers 38.87.162.1;
            option domain-name-servers 38.87.162.1;
            range 38.87.162.2 38.87.162.254;
            host username {
                    fixed-address 38.87.162.2;
                    hardware ethernet aa:bb:cc:dd:ee:ff;
            }
    }
    $ doas rcctl restart dhcpd