ZyXEL Communications 5 Series - Manual (Page 646)

ZyWALL 5/35/70 Series User’s Guide
646 Chapter 44 Filter Configuration
6 The firewall can block specific URL traffic that might occur in the future. The URL can
be saved in an Access Control List (ACL) database.
44.6 Applying a Filter
This section shows you where to apply the filter(s) after you design it (them). The ZyWALL
already has filters to prevent NetBIOS traffic from triggering calls, and block incoming telnet,
FTP and HTTP connections.
Note: If you do not activate the firewall, it is advisable to apply filters.
44.6.1 Applying LAN Filters
LAN traffic filter sets may be useful to block certain packets, reduce traffic and prevent
security breaches. Go to menu 3.1 (shown next) and enter the number(s) of the filter set(s) that
you want to apply as appropriate. You can choose up to four filter sets (from twelve) by
entering their numbers separated by commas, e.g., 3, 4, 6, 11. Input filter sets filter incoming
traffic to the ZyWALL and output filter sets filter outgoing traffic from the ZyWALL. For
PPPoE or PPTP encapsulation, you have the additional option of specifying remote node call
filter sets.
Figure 392 Filtering LAN Traffic
44.6.2 Applying DMZ Filters
DMZ traffic filter sets may be useful to block certain packets, reduce traffic and prevent
security breaches. Go to menu 5.1 (shown next) and enter the number(s) of the filter set(s) that
you want to apply as appropriate. You can choose up to four filter sets (from twelve) by
entering their numbers separated by commas, e.g., 3, 4, 6, 11. Input filter sets filter incoming
traffic to the ZyWALL and output filter sets filter outgoing traffic from the ZyWALL. The
ZyWALL already has filters to prevent NetBIOS traffic from triggering calls, and block
incoming telnet, FTP and HTTP connections.
Menu 3.1 - LAN Port Filter Setup
Input Filter Sets:
protocol filters=
device filters=
Output Filter Sets:
protocol filters=
device filters=
Press ENTER to Confirm or ESC to Cancel: