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Chapter 10 Content Filtering
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174
10.3
The Schedule Screen
Use this screen to set the days and times for the ZyXEL Device to perform content filtering.
Click
Security > Content Filter
>
Schedule
. The screen appears as shown.
Figure 99
Security > Content Filter > Schedule
The following table describes the labels in this screen.
Clear All
Click this to remove all of the keywords from the list.
Keyword
Type a keyword in this field. You may use any character (up to 127
characters). Wildcards are not allowed.
Add Keyword
Click this after you have typed a keyword.
Repeat this procedure to add other keywords. Up to 64 keywords are
allowed.
When you try to access a web page containing a keyword, you will get a
message telling you that the content filter is blocking this request.
Apply
Click this to save your changes.
Cancel
Click this to restore your previously saved settings.
Table 58
Security > Content Filtering > Keyword (continued)
LABEL
DESCRIPTION
Table 59
Security > Content Filter: Schedule
LABEL
DESCRIPTION
Schedule
Select
Block Everyday
to make the content filtering active everyday.
Otherwise, select
Edit Daily to Block
and configure which days of the week (or
everyday) and which time of the day you want the content filtering to be active.
Active
Select the check box to have the content filtering to be active on the selected day.
Start TIme
Enter the time when you want the content filtering to take effect in hour-minute
format.
End Time
Enter the time when you want the content filtering to stop in hour-minute format.
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10.4
The Trusted Screen
Use this screen to exclude a range of users on the LAN from content filtering on your ZyXEL
Device. Click
Security > Content Filter
>
Trusted
. The screen appears as shown.
Figure 100
Security > Content Filter: Trusted
The following table describes the labels in this screen.
Apply
Click this to save your changes.
Cancel
Click this to restore your previously saved settings.
Table 59
Security > Content Filter: Schedule (continued)
LABEL
DESCRIPTION
Table 60
Security > Content Filter: Trusted
LABEL
DESCRIPTION
Start IP Address
Type the IP address of a computer (or the beginning IP address of a specific
range of computers) on the LAN that you want to exclude from content
filtering.
End IP Address
Type the ending IP address of a specific range of users on your LAN that
you want to exclude from content filtering. Leave this field blank if you want
to exclude an individual computer.
Apply
Click this to save your changes.
Cancel
Click this to restore your previously saved settings.
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C
HAPTER
11
Packet Filter
11.1
Overview
Your ZyXEL Device uses filters to decide whether to allow passage of traffic. This chapter
discusses how to create and apply filters.
11.1.1
What You Can Do in the Packet Filter Screen
Use the
Packet Filter
screens (
Section 11.2 on page 177
) to display the filter sets and
configure the rules for protocol and generic filters.
11.1.2
What You Need to Know About the Packet Filter
Filters
Your ZyXEL Device uses filters to decide whether to allow passage of a data packet. Filters
are subdivided into generic and protocol filters. Generic filter rules act on the raw data from/to
LAN and WAN. Protocol filter
rules act on IP packets.
Filter Structure
A filter set consists of one or more filter rules. The ZyXEL Device allows you to configure up
to twelve filter sets with six rules in each set, for a total of 72 filter rules in the system. You
cannot mix generic filter rules and protocol filter rules within the same set. You can apply up
to four filter sets to a particular port to block multiple types of packets. With each filter set
having up to six rules, you can have a maximum of 24 rules active for a single port.
Finding Out More
See
Section 11.3 on page 183
for technical background information on packet filters.
11.2
The Packet Filter Screen
Use this screen to set up packet filters on your ZyXEL Device. Click
Security > Packet Filter
to display the following screen.
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Chapter 11 Packet Filter
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Figure 101
Security > Packet Filter
The following table describes the labels in this screen.
11.2.1
Editing Protocol Filters
Use this screen to display a protocol filter set on your ZyXEL Device. Protocol rules allow you
to base the rule on the fields in the IP and the upper layer protocol, for example, UDP and TCP
headers.
In the
Packet Filter
screen, select
Protocol Filter
from the
Filter Type
field. Then click the
Edit
button from the
Modify
field to display the following screen.
Table 61
Security > Packet Filter
LABEL
DESCRIPTION
#
This field displays the index number of the filter set.
Name
Enter a name for the filter set. The text may consist of up to 16 letters, numerals
and any printable character found on a typical English language keyboard.
Filter Type
Select
Protocol Filter
or
Generic Filter
for your filter set.
Protocol filter rules are used to filter IP packets while generic filter rules allow
filtering of non-IP packets.
Modify
Click the
Edit
button to configure a filter set.
Click the
Remove
button to delete a filter set.
Apply
Click this to save your changes.
Cancel
Click this to restore your previously saved settings.

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