How its works and How to use Framed-ip-address

[One Zero Art]

Hi,

I successfully installed freeradius on Ubuntu 18**. I am using PPPoE server
in mikrotik. I want to control PPPoE user ip address. Only match ip
address, username and password can connect with network. Is this even
possible?

Also, I want to know about Framed-ip-address and how its works with
freeradius.  I searched google but not found my need.

Thank you :)

Sorry for Bad English.