User Manager/MAC binding
From MikroTik Wiki
Description
MAC binding is a feature, when users MAC address is not specified beforehand, but is fixed (bound) when the user connects for the first time. Further the user is allowed to use only this MAC address.
In User Manager MAC address can be re-bound also for users with previously fixed one. In this case MAC address is re-fixed at next user logon.
Binding MAC address in the Web interface
TODO
Binding MAC address in console
To bind MAC address in console, just change users caller-id to "bind":
/tool user-manager add customer=admin name=user1 caller-id=bind