ZyXEL P-202H User Guide - Page 249
Firewall Versus Filters, Applying a Filter
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Figure 149 Protocol and Device Filter Sets P-202H Plus v2 User's Guide 25.5 Firewall Versus Filters Firewall configuration is discussed in the firewall chapters of this manual. Further comparisons are also made between filtering, NAT and the firewall. 25.6 Applying a Filter This section shows you where to apply the filter(s) after you design it (them). The ZyXEL Device 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. 25.6.1 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. The factory default filter set, NetBIOS_LAN, is inserted in the protocol filters field under Input Filter Sets in menu 3.1 in order to prevent local NetBIOS messages from triggering calls to the DNS server. Input filter sets filter incoming traffic to the ZyXEL Device and output filter sets filter outgoing traffic from the ZyXEL Device. Chapter 25 Filter Configuration 248