ZyXEL Communications P-334WT Technical Information PDF herunterladen (Seite 112)

Filter Example

A filter for blocking the web service

● Configuration

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.

❍ Create a filter set in Menu 21, e.g., set 1

❍ Create three filter rules in Menu 21.1.1, Menu 21.1.2, Menu 21.1.3

■ Rule 1- block the HTTP packet, TCP (06) protocol with port number 80

■ Rule 2- block the DNS packet, TCP (06) protocol with port number 53

■ Rule 3- block the DNS packet, UDP (17) protocol with port number 53

❍ Apply the filter set in menu 4

1. Create a filter set in Menu 21

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ZyXEL Communications P-334WT Technical Information Seite 112