hello everybody,i have made a Web Server, and when the clients dont pay, i add ip addresses in firewall rules but i wanna know it is secure..
what exactly is secure?
exactly secure is because can he steal internet, because when i redirect his ip address to this webserver if he is online in msn, he can write msn, until i disable his bridge and then i cannot work in internet..the protocol is TCP
omg… just add another rule to drop non-80 port connections for users in banlist 
Better use HotSpot, user should authorize in the HotSpot before Internet is available.
http://www.mikrotik.com/testdocs/ros/2.9/ip/hotspot.php
Login page will be given to use, before he/she will be able to access the internet. You may information about your company and other useful information to login page.