Applying Lan Filters; Applying Dmz Filters; Figure 442 Filtering Lan Traffic; Figure 443 Filtering Dmz Traffic - ZyXEL Communications ZYWALL 35 User Manual

Chapter 45 Filter Configuration
If you do not activate the firewall, it is advisable to apply filters.

45.6.1 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 442 Filtering LAN Traffic

45.6.2 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.

Figure 443 Filtering DMZ Traffic

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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:
Menu 5.1 - DMZ 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:
ZyWALL 5/35/70 Series User's Guide