12
Packet Filter
12.1 Overview
Your ZyXEL Device uses filters to decide whether to allow passage of traffic. This chapter discusses how to create and apply filters.
12.1.1 What You Can Do in the Packet Filter Screen
Use the Packet Filter screens (Section 12.2 on page 220) to display the filter sets and configure the rules for protocol and generic filters.
12.1.2 What You Need to Know About the Packet Filter
Filters
Your ZyXEL Device uses filters to decide whether to allow passage of a data packet. Filters are subdivided into generic and protocol filters. Generic filter rules act on the raw data from/to LAN and WAN. Protocol filter rules act on IP packets.
Filter Structure
A filter set consists of one or more filter rules. The ZyXEL Device allows you to configure up to twelve filter sets with six rules in each set, for a total of 72 filter rules in the system. You cannot mix generic filter rules and protocol filter rules within the same set. You can apply up to four filter sets to a particular port to block multiple types of packets. With each filter set having up to six rules, you can have a maximum of 24 rules active for a single port.
Finding Out More
See Section 12.3 on page 226 for technical background information on packet filters.
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