Chapter 38 Filter Configuration

"If you do not activate the firewall, it is advisable to apply filters.

38.6.1Applying 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 379 Filtering LAN Traffic

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:

38.6.2 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 380 Filtering DMZ Traffic

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:

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ZyWALL 2 Plus User’s Guide