ZyXEL Communications ZyXEL ZyWALL 5 - Manual (Page 478)

ZyWALL 5 User’s Guide
Chapter 35 Filter Configuration 477
35.6 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.
35.6.1 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 290 Filtering LAN Traffic
35.6.2 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: