anyone know that how to stop hotspot hacking through MAC address, and how to secure hotspot network by hackers.

- ensure proper Layer2-Isolation of your customers
- only hand out /32 addresses with DHCP-hotspot.
- use arp: reply-only in conjuction with dhcp.

Please explain it in detail, i can`t understand it . Please. with image or script or commands

read this discussion. if you don't use bridge, and do proper configuration, you will not be affected:
http://forum.mikrotik.com/viewtopic.php?f=2&t=59118