ZyXEL P-661H Series Manual de usuario descargar pdf (Pagina 15)

Table of Contents

P-661H/HW Series User’s Guide

8.5 Stateful Inspection ............................................................................................................. 142

8.5.1 Stateful Inspection Process ...................................................................................... 143

8.5.2 Stateful Inspection and the ZyXEL Device ............................................................... 144

8.5.3 TCP Security ............................................................................................................ 144

8.5.4 UDP/ICMP Security .................................................................................................. 145

8.5.5 Upper Layer Protocols ............................................................................................. 145

8.6 Guidelines for Enhancing Security with Your Firewall ....................................................... 146

8.6.1 Security In General .................................................................................................. 146

8.7 Packet Filtering Vs Firewall ...............................................................................................147

8.7.1 Packet Filtering: ....................................................................................................... 147

8.7.2 Firewall ..................................................................................................................... 147

Chapter 9

Firewall Configuration ..........................................................................................................149

9.1 Access Methods ................................................................................................................ 149

9.2 Firewall Policies Overview .................................................................................................149

9.3 Rule Logic Overview .......................................................................................................... 150

9.3.1 Rule Checklist .......................................................................................................... 150

9.3.2 Security Ramifications .............................................................................................. 150

9.3.3 Key Fields For Configuring Rules ............................................................................ 151

9.4 Connection Direction ......................................................................................................... 151

9.4.1 LAN to WAN Rules ................................................................................................... 152

9.4.2 Alerts ........................................................................................................................ 152

9.5 Triangle Route ................................................................................................................... 152

9.5.1 The “Triangle Route” Problem .................................................................................. 152

9.5.2 Solving the “Triangle Route” Problem ...................................................................... 153

9.6 General Firewall Policy ................................................................................................... 154

9.7 Firewall Rules Summary ................................................................................................... 155

9.7.1 Configuring Firewall Rules ..................................................................................... 157

9.7.2 Customized Services .............................................................................................. 160

9.7.3 Configuring A Customized Service ......................................................................... 160

9.8 Example Firewall Rule ....................................................................................................... 161

9.9 Anti Probing ....................................................................................................................... 165

9.10 DoS Thresholds .............................................................................................................. 166

9.10.1 Threshold Values ................................................................................................... 166

9.10.2 Half-Open Sessions ............................................................................................... 167

9.10.3 Configuring Firewall Thresholds ............................................................................. 167

Chapter 10

Content Filtering ................................................................................................................... 171

10.1 Content Filtering Overview ............................................................................................. 171

10.2 Configuring Keyword Blocking ........................................................................................ 171

10.3 Configuring the Schedule ............................................................................................... 172

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 357 358

ZyXEL P-661H Series Manual de usuario Pagina 15

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ZyXEL P-661H Series Manual de usuario Pagina 15

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