Filter Example

A filter for blocking the web connections from LAN


If you want to avoid the outbound Web request to trigger a call to the remote web server, you can configure a call filter set in Prestige to block this packet. After the call filter is applied, the Web packet will not triggered the call to your ISP or remote node. However, when the call is trigger by the other packets and the Internet connection is established, the workstations then are able to access the Web page.

Before configuring a filter, you need to know the following information:

1. The outbound packet type (protocol & port number)
2. The source IP address

Generally, the outbound packets for Web service could be as following:

a. HTTP packet, TCP (06) protocol with port number 80
b. DNS packet, TCP (06) protocol with port number 53 or
c. DNS packet, UDP (17) protocol with port number 53

For all workstation on the LAN, the source IP address will be 0.0.0.0. Otherwise, you have to enter an IP Address for the workstation you want to block. See the procedure for configuring this filter below.

 

 

 

 

 


All contents copyright © 1999 ZyXEL Communications Corporation.