How to trace MAC  Address Of a Machine with PL/SQL

As MAC Address Of a Machine is Unique, for security, how to use trace the MAC Address of a machine on a WAN/LAN and record it in the database.Please note that it is important part of Audit Trail

MAC ADDRESS is unique, whereas IP Address is variable. Experienced user can very easily change (fake) MAC address.
Maybe you will be surprised it is trivial as changing of IP.
You may be able to build a component that is external to the database that can determine a MACOn linux (for example) you could use "arping" command or retrive MAC adressess from arp cache using "arp" command. arp cache stores MAC adresess of all computers which are or was connected to machine. These commands can run only privileged user (root) but you could give execute privilege for specific user (oracle) via "sudo". You can execute this commands using external procedure or call it from Java stored procedure.
It think tracking of IP will be enough beause IP must be unique on network (or in specific subnet).
So MAC tracking is waste of time (IMHO).

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