try to use VPN OR IPTables/IPChains OR IPSec/IP Filtering!
Filter
To add a firewall rule which drops all TCP packets that are destined to port 135 and going through the router, use the following command:
(the commands will drop all connection to port 135)
/ip firewall filter add chain=forward dst-port=135 protocol=tcp action=drop
To deny acces to the router via Telnet (protocol TCP, port 23), type the following command:
/ip firewall filter add chain=input protocol=tcp dst-port=23 action=drop
or for complete list, please read manual :
http://www.mikrotik.com/testdocs/ros/2.9/ip/filter.php
Firewall address lists allow to create a list of IP addresses to be used for packet matching.
http://www.mikrotik.com/testdocs/ros/2. ... s_list.php
IP Security
http://www.mikrotik.com/testdocs/ros/2.9/ip/ipsec.php