ZyXEL P-2802HW-I1 User Guide - Page 15

Table of Contents 10.16 PSTN Line Screen ("L" models only 152 Chapter 11 Firewalls...155 11.1 Firewall Overview ...155 11.1.1 Stateful Inspection Firewall 155 11.1.2 About the ZyXEL Device Firewall 155 11.1.3 Guidelines For Enhancing Security With Your Firewall 156 11.2 General Firewall Policy Overview 156 11.3 Security Considerations 158 11.4 Triangle Route ...158 11.4.1 The "Triangle Route" Problem 158 11.4.2 Solving the "Triangle Route" Problem 159 11.5 General Firewall Policy 160 11.6 Firewall Rules Summary 161 11.6.1 Configuring Firewall Rules 163 11.6.2 Customized Services 166 11.6.3 Configuring A Customized Service 166 11.7 Example Firewall Rule ...167 11.8 Firewall Thresholds ...171 11.8.1 Threshold Values ...172 11.8.2 Configuring Firewall Thresholds 172 Chapter 12 Content Filtering ...175 12.1 Content Filtering Overview 175 12.2 Configuring Keyword Blocking 175 12.3 Configuring the Schedule 176 12.4 Configuring Trusted Computers 177 Chapter 13 Introduction to IPSec...179 13.1 VPN Overview ...179 13.1.1 IPSec ...179 13.1.2 Security Association 179 13.1.3 Other Terminology 179 13.1.4 VPN Applications 180 13.2 IPSec Architecture ...180 13.2.1 IPSec Algorithms ...181 13.2.2 Key Management 181 13.3 Encapsulation ...181 13.3.1 Transport Mode ...182 13.3.2 Tunnel Mode ...182 P-2802H(W)(L)-I Series User's Guide 15