Zyxel-communications P-2802H(W)(L)-I Series Manual do Utilizador descarregar pdf (Página 15)

Table of Contents

P-2802H(W)(L)-I Series User’s Guide

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

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