How to distribute the Internet to a client by mac address, bypassing pppoe and vpn connections?

Question

Computer networks

It is necessary to give access to the Internet bypassing all vpn and pppoe connections.
In which direction to read to give access to the mac address?

Answer 1

DHCP gives out by MAC IP: either gray (and then a router with NAT), or immediately white

Answer 2

Vpn is used primarily to identify the client. Clients can always change the Mac address to any other. To prevent this, you can configure port security on the switch if it is smart enough to do so.

Answer 3

on a poppy is possible only in a flat network

Answer 4

https://accel-ppp.org/wiki/doku.php?id=ru:ipoe
Or other BRAS