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Cable/DSL Firewall Router Page 25
4-3 Access Control
The Access Control feature allows administrators to block certain users from accessing the
Internet or specific applications. Before using this function, the network computers that you
wish to control should be assigned fixed IP Addresses.
IP Access Setting
Network administrators can restrict access of up to five groups of specified network users/
computers.
■ Protocol Select the protocol type as “TCP” or “UDP” from the drop down box. If you are
not sure which one to choose, select “Both”.
■ Filter Group/LAN IP Range Enter the range of IP addresses which you want to have the
same access limitation (a group).
■ Block Port Range Enter the range of port numbers which are used by the applications you
wish to be blocked. (For example 23 for Telnet)
Here is an example for IP Access Setting. Enter the range of 51~80 in the “Filter Group”
column and 20~80 in the “Block Port Range” column, then click the “Apply” button. As a
result, the user’s computers which have IP Addresses in the range of 192.168.1.51 to
192.168.1.80 will not be able to use the applications which use port numbers from 20 to 80,
such as FTP, Telnet and web browsing.