MAC cloning

I detected intrusion into my network. On monitoring i observed that some guys use Iris/network magic and Tmac changer to monitor and clone mac addresses and actually browse. I disabled the ip binding to and removed the bypassed mac addresses to stop this temporally. What is the remedy for this kind of attack. i use hotspot.

use PPPoE with encryption instead

Thanks, where can I find the configuration instruction

PPPoE is a method of authenticating users based on username+password. It will also encrypt the communications. The drawback is that the client computer has to configure a PPPoE connection (built into Windows and MacOS). Manual: http://www.mikrotik.com/testdocs/ros/3.0/vpn/pppoe.php

Thanks bro