ZyXEL P-202H User Guide - Page 235
Filter Configuration
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P-202H Plus v2 User's Guide CHAPTER 25 Filter Configuration This chapter shows you how to create and apply filters. 25.1 Introduction to Filters Your ZyXEL Device uses filters to decide whether to allow passage of a data packet and/or to make a call. There are two types of filter applications: data filtering and call filtering. Filters are subdivided into device and protocol filters, which are discussed later. Data filtering screens the data to determine if the packet should be allowed to pass. Data filters are divided into incoming and outgoing filters, depending on the direction of the packet relative to a port. Data filtering can be applied on either the WAN side or the LAN side. Call filtering is used to determine if a packet should be allowed to trigger a call. Outgoing packets must undergo data filtering before they encounter call filtering. Call filters are divided into two groups, the built-in call filters and user-defined call filters. Your ZyXEL Device has built-in call filters that prevent administrative, for example, RIP packets from triggering calls. These filters are always enabled and not accessible to you. Your ZyXEL Device applies the built-in filters first and then the user-defined call filters, if applicable, as shown next. Figure 135 Outgoing Packet Filtering Process For incoming packets, your ZyXEL Device applies data filters only. Packets are processed depending on whether a match is found. The following sections describe how to configure filter sets. Chapter 25 Filter Configuration 234