ARPCHECK

Uses `arping` utility to check for presence of device on network.

Copy arpcheck to /usr/local/bin
Create /var/log/arpcheck directory (or directory to match log directory in conf file)
Copy arpcheck-default.conf to device specific configuration file. ex.: arpcheck-johndoe.conf You may make as many individual configuartion files as you want.
Create /etc/arpcheck directory
Copy arpcheck config files you made to /etc/arpcheck directory
Copy arpcheck@.service file to /etc/systemd/system
Enable service: systemctl enable arpcheck@<name_of_config_file>.service
Start service: systemctl start arpcheck@<name_of_config_file>.service