3-18
Item Description
Destination
Port
Specifies the ports through which hosts on the LAN
access the Internet.
For example, for the telnet port (23), enter 23 ~ 23.
Operation
Specifies the status of the rule:
z Deny: Filters out packets matching the rule while
allowing other packets to pass.
z Permit: Filters out all packets except those
matching the rule.
z None: The rule is ineffective.
Table 3-2 Common services and corresponding port numbers
Service Protocol Port number
FTP service TCP 21
Telnet service TCP 23
TFTP service UDP 69
Web service TCP 80
Content Filtering
The content filtering function allows you to control the websites users
can access. You can perform such content filtering by the host names,
protocol types, or website addresses.
Follow these steps to configure content filtering rules:
Select Security Setup > URL Filter from the navigation tree to enter
the URL filtering configuration page shown below.
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