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ZyXEL Communications unified security gateway manual 496

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Chapter 30 Content Filtering

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496
496	ZyWALL USG 20/20W User’s Guide

Contents

Default Login Details www.zyxel.com Page About This User's Guide Page Page Document Conventions Page Safety Warnings Contents Overview Page Table of Contents Page Page Part II: Technical Reference Page Page Page Page Page Page Page Page Page Page Page Page Page Page Introducing the ZyWALL 1.1 Overview and Key Default Settings 1.2 Wall-mounting Page Page 1.3 Front Panel 1.3.1 Front Panel LEDs 1.4 Management Overview 1.5 Starting and Stopping the ZyWALL Page Page Features and Applications 2.1 Features Page 2.2 Applications 2.2.1 VPN Connectivity 2.2.2 SSL VPN Network Access 2.2.2.1 Full Tunnel Mode 2.2.3 User-AwareAccess Control Page Web Configurator 3.1 Web Configurator Requirements 3.2Web Configurator Access Page 3.3 Web Configurator Screens Overview 3.3.1 Title Bar 3.3.2 Navigation Panel 3.3.2.2 Monitor Menu 3.3.2.3 Configuration Menu Page Page 3.3.2.4 Maintenance Menu 3.3.3 Main Window 3.3.3.2 Site Map 3.3.3.3 Object Reference 3.3.4 Tables and Lists 3.3.4.1 Manipulating Table Display Page 3.3.4.2 Working with Table Entries 3.3.4.3 Working with Lists Page Installation Setup Wizard 4.1 Installation Setup Wizard Screens 4.1.1Internet Access Setup - WAN Interface 4.1.2Internet Access: Ethernet 4.1.3Internet Access: PPPoE 4.1.3.2WAN IP Address Assignments 4.1.4 Internet Access: PPTP 4.1.5ISP Parameters 4.1.5.1PPTP Configuration 4.1.5.2WAN IP Address Assignments 4.1.6 Internet Access - Finish 4.2 Device Registration Page Page Page Quick Setup 5.1 Quick Setup Overview 5.2 WAN Interface Quick Setup 5.2.1 Choose an Ethernet Interface 5.2.2 Select WAN Type 5.2.3 Configure WAN Settings 5.2.4WAN and ISP Connection Settings Page 5.2.5 Quick Setup Interface Wizard: Summary 5.3 VPN Quick Setup 5.4 VPN Setup Wizard: Wizard Type 5.5 VPN Express Wizard - Scenario 5.5.1 VPN Express Wizard - Configuration 5.5.2 VPN Express Wizard - Summary 5.5.3 VPN Express Wizard - Finish 5.5.4 VPN Advanced Wizard - Scenario 5.5.5VPN Advanced Wizard - Phase 1 Settings 5.5.6VPN Advanced Wizard - Phase Page 5.5.7 VPN Advanced Wizard - Summary 5.5.8 VPN Advanced Wizard - Finish Configuration Basics 6.1Object-basedConfiguration 6.2 Zones, Interfaces, and Physical Ports 6.2.1 Interface Types 6.2.2 Default Interface and Zone Configuration 6.3Terminology in the ZyWALL 6.4 Packet Flow 6.4.1Routing Table Checking Flow Page 6.4.2NAT Table Checking Flow 6.5Feature Configuration Overview 6.5.1 Feature 6.5.2 Licensing Registration 6.5.3 Interface 6.5.4 Trunks 6.5.5 Policy Routes Page 6.5.6 Static Routes 6.5.7 Zones 6.5.8 DDNS 6.5.9 NAT 6.5.10 HTTP Redirect 6.5.11 ALG 6.5.12 Auth. Policy 6.5.13 Firewall 6.5.14 IPSec VPN 6.5.15 SSL VPN 6.5.16 Bandwidth Management 6.5.17 ADP 6.5.18 Content Filter 6.5.19 Anti-Spam 6.6 Objects 6.6.1 User/Group 6.7 System 6.7.1 DNS, WWW, SSH, TELNET, FTP, SNMP, Vantage CNM 6.7.2Logs and Reports 6.7.3 File Manager 6.7.4 Diagnostics 6.7.5 Shutdown Tutorials 7.1How to Configure Interfaces, Port Roles, and Zones 7.1.1 Configure a WAN Ethernet Interface 7.1.2 Configure Port Roles 7.1.3 Configure the DMZ Interface for a Local Network 7.1.4 Configure Zones 7.2 How to Configure a Cellular Interface Page 7.3How to Configure Load Balancing 7.3.1 Set Up Available Bandwidth on Ethernet Interfaces 7.3.2Configure the WAN Trunk Page 7.4 How to Set Up an IPSec VPN Tunnel 7.4.1 Set Up the VPN Gateway 7.4.2 Set Up the VPN Connection 7.4.3Configure Security Policies for the VPN Tunnel 7.5 How to Configure User-awareAccess Control 7.5.1 Set Up User Accounts 7.5.2Set Up User Groups 7.5.3Set Up User Authentication Using the RADIUS Server Page 7.6How to Use a RADIUS Server to Authenticate User Accounts based on Groups Page 7.7How to Use Endpoint Security and Authentication Policies 7.7.1 Configure the Endpoint Security Objects Page 7.7.2 Configure the Authentication Policy 7.8 How to Configure Service Control 7.8.1 Allow HTTPS Administrator Access Only From the LAN Page 7.9How to Allow Incoming H.323 Peer-to-peerCalls 7.9.1 Turn On the ALG 7.9.2 Set Up a NAT Policy For H.323 Page 7.9.3 Set Up a Firewall Rule For H.323 7.10 How to Allow Public Access to a Web Server 7.10.1 Create the Address Objects 7.10.2 Configure NAT 7.10.3 Set Up a Firewall Rule 7.11 How to Use an IPPBX on the DMZ Page 7.11.1 Turn On the ALG 7.11.2 Create the Address Objects 7.11.3 Setup a NAT Policy for the IPPBX 7.11.4 Set Up a WAN to DMZ Firewall Rule for SIP 7.11.5 Set Up a DMZ to LAN Firewall Rule for SIP 7.12How to Use Multiple Static Public WAN IP Addresses for LAN to WAN Traffic 7.12.1 Create the Public IP Address Range Object 7.12.2 Configure the Policy Route 7.13 How to Set Up a Wireless LAN 7.13.1 Set Up User Accounts 7.13.2 Create the WLAN Interface Page Page 7.13.3 Set Up the Wireless Clients to Use the WLAN Interface Page Page Page 7.13.3.2 Configure the Funk Odyssey Wireless Client Page Page 7.13.3.3 Wireless Clients Import the ZyWALL’s Certificate Page Page Page Page 7.13.3.4 Wireless Clients Use the WLAN Interface Page Page Dashboard 8.1 Overview 8.1.1 What You Can Do in this Chapter 8.2The Dashboard Screen Page Page Page Page Page 8.2.1 The CPU Usage Screen 8.2.2 The Memory Usage Screen 8.2.3 The Active Sessions Screen 8.2.4 The VPN Status Screen 8.2.5 The DHCP Table Screen 8.2.6 The Number of Login Users Screen Page Monitor 9.1 Overview 9.1.1 What You Can Do in this Chapter 9.2The Port Statistics Screen Page 9.2.1 The Port Statistics Graph Screen 9.3 Interface Status Screen Page 9.4 The Traffic Statistics Screen Page Page 9.5 The Session Monitor Screen Page Page 9.6 The DDNS Status Screen 9.7 IP/MAC Binding Monitor 9.8 The Login Users Screen 9.9 WLAN Status Screen Cellular Status Screen Page 9.10.1 More Information 9.11 USB Storage Screen 9.12 The IPSec Monitor Screen Page 9.12.1 Regular Expressions in Searching IPSec SAs 9.13 The SSL Connection Monitor Screen Page 9.14 The Content Filter Statistics Screen Page 9.15 Content Filter Cache Screen Page 9.16 The Anti-SpamStatistics Screen Page 9.17 The Anti-SpamStatus Screen 9.18 Log Screen Page Page Page Registration 10.1 Overview 10.1.1What You Can Do in this Chapter 10.1.2What you Need to Know 10.2 The Registration Screen Page 10.3 The Service Screen Page Page Interfaces 11.1 Interface Overview 11.1.1What You Can Do in this Chapter 11.1.2 What You Need to Know Page 11.2Port Role Page 11.3 Ethernet Summary Screen 11.3.1 Ethernet Edit Page Page Page Page Page Page Page Page 11.3.2 Object References 11.4 PPP Interfaces 11.4.1 PPP Interface Summary 11.4.2 PPP Interface Add or Edit Page Page Page 11.5 Cellular Configuration Screen (3G) Page 11.5.1 Cellular Add/Edit Screen Page Page Page Page Page Page 11.6 WLAN Interface General Screen Page Page Page 11.6.1 WLAN Add/Edit Screen Page Page Page Page Page 11.6.2 WLAN Add/Edit: WEP Security 11.6.3 WLAN Add/Edit: WPA-PSK/WPA2-PSKSecurity 11.6.4 WLAN Add/Edit: WPA/WPA2 Security Page 11.7 WLAN Interface MAC Filter Page 11.8 VLAN Interfaces Page 11.8.1 VLAN Summary Screen 11.8.2 VLAN Add/Edit Page Page Page Page Page Page 11.9 Bridge Interfaces Page 11.9.1 Bridge Summary 11.9.2 Bridge Add/Edit Page Page Page Page 11.9.3 Virtual Interfaces Add/Edit Page 11.10 Interface Technical Reference Page Page Page Page Trunks 12.1 Overview 12.1.1What You Can Do in this Chapter 12.1.2What You Need to Know Page 12.2 The Trunk Summary Screen 12.3 Configuring a Trunk Page 12.4 Trunk Technical Reference Page Policy and Static Routes 13.1 Policy and Static Routes Overview 13.1.1What You Can Do in this Chapter 13.1.2What You Need to Know Page 13.2Policy Route Screen Page Page 13.2.1 Policy Route Edit Screen Page Page Page 13.3 IP Static Route Screen 13.3.1 Static Route Add/Edit Screen 13.4 Policy Routing Technical Reference NAT and SNAT Assured Forwarding (AF) PHB for DiffServ Port Triggering Maximize Bandwidth Usage Page Routing Protocols 14.1 Routing Protocols Overview 14.1.1What You Can Do in this Chapter 14.1.2What You Need to Know 14.2 The RIP Screen 14.3 The OSPF Screen Page Page Page 14.3.1 Configuring the OSPF Screen Page Page 14.3.2 OSPF Area Add/Edit Screen 14.3.3 Virtual Link Add/Edit Screen 14.4 Routing Protocol Technical Reference Page Page Zones 15.1 Zones Overview 15.1.1 What You Can Do in this Chapter 15.1.2 What You Need to Know 15.2 The Zone Screen 15.3 Zone Edit DDNS 16.1 DDNS Overview 16.1.1What You Can Do in this Chapter 16.1.2What You Need to Know 16.2 The DDNS Screen Page 16.2.1 The Dynamic DNS Add/Edit Screen Page Page NAT 17.1 NAT Overview 17.1.1 What You Can Do in this Chapter 17.1.2 What You Need to Know 17.2The NAT Screen Page 17.2.1 The NAT Add/Edit Screen Page Page 17.3 NAT Technical Reference NAT Loopback Page Page Page HTTP Redirect 18.1 Overview LAN1 18.1.1 What You Can Do in this Chapter 18.1.2 What You Need to Know 18.2 The HTTP Redirect Screen 18.2.1 The HTTP Redirect Edit Screen ALG 19.1 ALG Overview 19.1.1 What You Can Do in this Chapter 19.1.2 What You Need to Know Page Page 19.1.3Before You Begin 19.2 The ALG Screen Page 19.3 ALG Technical Reference Page IP/MAC Binding 20.1 IP/MAC Binding Overview 20.1.1What You Can Do in this Chapter 20.1.2 What You Need to Know 20.2 IP/MAC Binding Summary 20.2.1 IP/MAC Binding Edit 20.2.2 Static DHCP Edit 20.3 IP/MAC Binding Exempt List Page Authentication Policy 21.1 Overview 21.1.1 What You Can Do in this Chapter 21.1.2 What You Need to Know 21.2 Authentication Policy Screen Page Page 21.2.1 Creating/Editing an Authentication Policy Page Page Page Firewall 22.1 Overview 22.1.1What You Can Do in this Chapter 22.1.2 What You Need to Know Page 22.1.3Firewall Rule Example Applications Page Page 22.1.4 Firewall Rule Configuration Example Page 22.2 The Firewall Screen 22.2.1 Configuring the Firewall Screen Page Page 22.2.2 The Firewall Add/Edit Screen 22.3 The Session Limit Screen Page 22.3.1 The Session Limit Add/Edit Screen Page Page IPSec VPN 23.1 IPSec VPN Overview 23.1.1What You Can Do in this Chapter 23.1.2What You Need to Know Page 23.1.3Before You Begin 23.2The VPN Connection Screen Page 23.2.1 The VPN Connection Add/Edit (IKE) Screen Page Page Page Page Page Page 23.2.2 The VPN Connection Add/Edit Manual Key Screen Page Page 23.3 The VPN Gateway Screen 23.3.1 The VPN Gateway Add/Edit Screen Page Page Page Page Page Page Page 23.4 IPSec VPN Background Information IKE SA Overview Page Page Page Page Page IPSec SA Overview Page Page Page Page Page SSL VPN 24.1 Overview 24.1.1What You Can Do in this Chapter 24.1.2What You Need to Know Page 24.2 The SSL Access Privilege Screen 24.2.1 The SSL Access Policy Add/Edit Screen Page Page 24.3 The SSL Global Setting Screen 24.3.1 How to Upload a Custom Logo 24.4 Establishing an SSL VPN Connection Page SSL User Screens 25.1 Overview 25.1.1 What You Need to Know 25.2 Remote User Login Page Page Page Page 25.3 The SSL VPN User Screens 25.4 Bookmarking the ZyWALL 25.5Logging Out of the SSL VPN User Screens Page Page SSL User Application Screens 26.1 SSL User Application Screens Overview 26.2 The Application Screen Page ZyWALL SecuExtender 27.1 The ZyWALL SecuExtender Icon 27.2 Statistics 27.3 View Log 27.4 Suspend and Resume the Connection 27.5 Stop the Connection 27.6 Uninstalling the ZyWALL SecuExtender Bandwidth Management 28.1 Overview 28.1.1 What You Can Do in this Chapter 28.1.2 What You Need to Know Page Page Page 28.1.3Bandwidth Management Examples 28.1.3.1 Setting the Interface’s Bandwidth 28.1.3.2SIP Any to WAN Bandwidth Management Example 28.1.3.3 SIP WAN to Any Bandwidth Management Example 28.1.3.4HTTP Any to WAN Bandwidth Management Example 28.1.3.5FTP WAN to DMZ Bandwidth Management Example 28.1.3.6FTP LAN to DMZ Bandwidth Management Example 28.2 TheBandwidth Management Screen Page 28.2.1 The Bandwidth Management Add/Edit Screen Page Page Page ADP 29.1 Overview 29.1.1 ADP 29.1.2What You Can Do in this Chapter 29.1.3What You Need To Know 29.1.4Before You Begin 29.2 The ADP General Screen 29.3 The Profile Summary Screen 29.3.1 Base Profiles 29.3.2 Configuring The ADP Profile Summary Screen 29.3.3 Creating New ADP Profiles 29.3.4 Traffic Anomaly Profiles Page Page 29.3.5 Protocol Anomaly Profiles 29.3.6 Protocol Anomaly Configuration Page Page Page 29.4 ADP Technical Reference Traffic Anomaly Background Information Page Page Page Protocol Anomaly Background Information Page Page Page Content Filtering 30.1 Overview 30.1.1What You Can Do in this Chapter 30.1.2What You Need to Know Page 30.1.3Before You Begin 30.2 Content Filter General Screen Page Page 30.3 Content Filter Policy Add or Edit Screen Page 30.4 Content Filter Profile Screen 30.5 Content Filter Categories Screen Page Page Page Page Page Page Page Page Page Page Page Page Page 30.5.1 Content Filter Blocked and Warning Messages 30.6 Content Filter Customization Screen Page Page 30.7 Content Filter Technical Reference External Content Filter Server Lookup Procedure Content Filter Reports 31.1 Overview 31.2 Viewing Content Filter Reports Page Page Page Page Page Page Page Anti-Spam 32.1 Overview 32.1.1What You Can Do in this Chapter 32.1.2What You Need to Know Page 32.2 Before You Begin 32.3 The Anti-SpamGeneral Screen Page 32.3.1 The Anti-SpamPolicy Add or Edit Screen Page 32.4 The Anti-SpamBlack List Screen Page 32.4.1 The Anti-SpamBlack or White List Add/Edit Screen 32.4.2 Regular Expressions in Black or White List Entries 32.5 The Anti-SpamWhite List Screen 32.6 The DNSBL Screen Page 32.7 Anti-SpamTechnical Reference Page Page Page Page User/Group 33.1 Overview 33.1.1What You Can Do in this Chapter 33.1.2What You Need To Know Page Page 33.2 User Summary Screen 33.2.1 User Add/Edit Screen Page Page 33.3 User Group Summary Screen 33.3.1 Group Add/Edit Screen 33.4 Setting Screen Page Page Page Page 33.4.2 User Aware Login Example 33.5 User /Group Technical Reference Page Addresses 34.1 Overview 34.1.1What You Can Do in this Chapter 34.1.2What You Need To Know 34.2Address Summary Screen Page 34.2.1 Address Add/Edit Screen 34.3 Address Group Summary Screen 34.3.1 Address Group Add/Edit Screen Page Services 35.1 Overview 35.1.1What You Can Do in this Chapter 35.1.2What You Need to Know 35.2The Service Summary Screen Page 35.2.1 The Service Add/Edit Screen 35.3 The Service Group Summary Screen Page 35.3.1 The Service Group Add/Edit Screen Schedules 36.1 Overview 36.1.1What You Can Do in this Chapter 36.1.2What You Need to Know 36.2The Schedule Summary Screen 36.2.1 The One-TimeSchedule Add/Edit Screen 36.2.2 The Recurring Schedule Add/Edit Screen Page Page AAA Server 37.1 Overview 37.1.1 Directory Service (AD/LDAP) 37.1.2 RADIUS Server 37.1.3 ASAS 37.1.4What You Can Do in this Chapter 37.1.5What You Need To Know Page 37.2Active Directory or LDAP Server Summary 37.2.1 Adding an Active Directory or LDAP Server Page 37.3 RADIUS Server Summary Page 37.3.1 Adding a RADIUS Server Page Authentication Method 38.1 Overview 38.1.1What You Can Do in this Chapter 38.1.2 Before You Begin 38.1.3 Example: Selecting a VPN Authentication Method 38.2Authentication Method Objects 38.2.1 Creating an Authentication Method Object Page Page Page Certificates 39.1 Overview 39.1.1What You Can Do in this Chapter 39.1.2What You Need to Know Page 39.1.3Verifying a Certificate Page 39.2 The My Certificates Screen 39.2.1 The My Certificates Add Screen Page Page Page Page 39.2.2 The My Certificates Edit Screen Page Page 39.2.3 The My Certificates Import Screen 39.3 The Trusted Certificates Screen 39.3.1 The Trusted Certificates Edit Screen Page Page Page 39.3.2 The Trusted Certificates Import Screen 39.4 Certificates Technical Reference OCSP Page ISP Accounts 40.1 Overview 40.1.1What You Can Do in this Chapter 40.2 ISP Account Summary 40.2.1 ISP Account Edit Page Page SSL Application 41.1 Overview 41.1.1What You Can Do in this Chapter 41.1.2What You Need to Know 41.1.3 Example: Specifying a Web Site for Access 41.2 The SSL Application Screen 41.2.1 Creating/Editing a Web-basedSSL Application Object Page Page Endpoint Security 42.1 Overview 42.1.1 What You Can Do in this Chapter 42.1.2 What You Need to Know 42.2 Endpoint Security Screen 42.3 Endpoint Security Add/Edit Page Page Page Page System 43.1 Overview 43.1.1What You Can Do in this Chapter 43.2 Host Name 43.3 USB Storage 43.4 Date and Time Page Page 43.4.1 Pre-definedNTP Time Servers List 43.4.2 Time Server Synchronization 43.5Console Port Speed 43.6 DNS Overview 43.6.1 DNS Server Address Assignment 43.6.2Configuring the DNS Screen Page Page 43.6.3 Address Record 43.6.4 PTR Record 43.6.5 Adding an Address/PTR Record 43.6.6 Domain Zone Forwarder 43.6.7 Adding a Domain Zone Forwarder 43.6.8 MX Record 43.6.9 Adding a MX Record 43.6.10 Adding a DNS Service Control Rule 43.7 WWW Overview 43.7.1 Service Access Limitations 43.7.2 System Timeout 43.7.3 HTTPS 43.7.4 Configuring WWW Service Control Page Page Page 43.7.5 Service Control Rules 43.7.6 Customizing the WWW Login Page Page Page Page 43.7.7 HTTPS Example 43.7.7.2 Netscape Navigator Warning Messages 43.7.7.3 Avoiding Browser Warning Messages 43.7.7.4Login Screen 43.7.7.5 Enrolling and Importing SSL Client Certificates Page Page Page 43.7.7.6 Using a Certificate When Accessing the ZyWALL Example 43.8 SSH 43.8.1 How SSH Works 43.8.2 SSH Implementation on the ZyWALL 43.8.3 Requirements for Using SSH 43.8.4 Configuring SSH Page 43.8.5 Secure Telnet Using SSH Examples 43.9Telnet 43.9.1 Configuring Telnet 43.10 FTP 43.10.1 Configuring FTP Page 43.11 SNMP Page 43.11.1Supported MIBs 43.11.2 SNMP Traps 43.11.3 Configuring SNMP Page 43.12 Vantage CNM 43.12.1 Configuring Vantage CNM Page 43.13 Language Screen Page Log and Report 44.1 Overview 44.1.1What You Can Do In this Chapter 44.2 Email Daily Report Page 44.3 Log Setting Screens 44.3.1 Log Setting Summary 44.3.2 Edit System Log Settings Page Page Page Page 44.3.3 Edit Remote Server Log Settings Page 44.3.4 Active Log Summary Screen Page Page File Manager 45.1 Overview 45.1.1What You Can Do in this Chapter 45.1.2What you Need to Know Page Page 45.2 The Configuration File Screen Page Page Page 45.3 The Firmware Package Screen Page 45.4 The Shell Script Screen Page Page Diagnostics 46.1 Overview 46.1.1What You Can Do in this Chapter 46.2 The Diagnostic Screen 46.2.1 The Diagnostics Files Screen 46.3 The Packet Capture Screen Page Page 46.3.1 The Packet Capture Files Screen 46.3.2 Example of Viewing a Packet Capture File 46.4 Core Dump Screen 46.4.1 Core Dump Files Screen 46.5 The System Log Screen Packet Flow Explore 47.1 Overview 47.1.1What You Can Do in this Chapter 47.2 The Routing Status Screen Page Page Page 47.3 The SNAT Status Screen Page Page Page Reboot 48.1 Overview 48.1.1 What You Need To Know 48.2 The Reboot Screen Page Shutdown 49.1 Overview 49.1.1 What You Need To Know 49.2 The Shutdown Screen Page Troubleshooting Page Page Page Page Page Page Page Page Page Page 50.1 Resetting the ZyWALL 50.2Getting More Troubleshooting Help Page Product Specifications Page Page Page 51.1 Power Adaptor Specifications Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Wireless LAN Topologies Page Channel RTS/CTS Page Fragmentation Threshold Preamble Type IEEE 802.11g Wireless LAN Wireless Security Overview IEEE RADIUS Types of EAP Authentication Dynamic WEP Key Exchange WPA and WPA2 Page Page Page Security Parameters Summary Antenna Overview Antenna Characteristics Types of Antennas for WLAN Positioning Antennas Internet Explorer Page Page Page Page Page Page Page Page Firefox Page Page Page Page Opera Page Page Page Page Page Page Konqueror Page Page Page Page End-UserLicense Agreement for “ZyWALL USG 20” Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page End-UserLicense Agreement for “ZyWALL USG 20W” Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Copyright Certifications (Class B) Page ZyXEL Limited Warranty Page Index