ZyXEL Communications HW-D Series, P-662H Chapter, Chapter, Content Filtering

P-662H/HW-D Series User’s Guide

11.3 Rule Logic Overview ......................................................................................	182
11.3.1 Rule Checklist .......................................................................................	182
11.3.2 Security Ramifications ..........................................................................	182
11.3.3 Key Fields For Configuring Rules .........................................................	183
11.3.3.1 Action ...........................................................................................	183
11.3.3.2 Service .........................................................................................	183
11.3.3.3 Source Address ...........................................................................	183
11.3.3.4 Destination Address ....................................................................	183
11.4 Connection Direction ......................................................................................	183
11.4.1 LAN to WAN Rules ................................................................................	184
11.4.2 Alerts .....................................................................................................	184
11.5 General Firewall Policy ................................................................................	184
11.6 Firewall Rules Summary ...............................................................................	185
11.6.1 Configuring Firewall Rules ...................................................................	187
11.6.2 Customized Services ............................................................................	190
11.6.3 Configuring A Customized Service .......................................................	191
11.7 Example Firewall Rule ....................................................................................	191
11.8 Predefined Services .......................................................................................	195
11.9 Anti-Probing ....................................................................................................	197
11.10 DoS Thresholds ...........................................................................................	198
11.10.1 Threshold Values ................................................................................	198
11.10.2 Half-Open Sessions ............................................................................	199
11.10.2.1 TCP Maximum Incomplete and Blocking Time ..........................	199
11.10.3 Configuring Firewall Thresholds ..........................................................	200
Chapter 12
Anti-Virus Packet Scan........................................................................................	203
12.1 Overview ........................................................................................................	203
12.1.1 Types of Computer Viruses ..................................................................	203
12.2 Signature-Based Virus Scan ..........................................................................	203
12.2.1 Computer Virus Infection and Prevention .............................................	204
12.3 Introduction to the ZyXEL Device Anti-virus Packet Scan .............................	204
12.3.1 How the ZyXEL Device Virus Scan Works ..........................................	205
12.3.2 Limitations of the ZyXEL Device Packet Scan ......................................	205
12.4 Anti-Virus Packet Scan Configuration ...........................................................	205
12.5 Registration and Online Update ....................................................................	207
12.5.1 Updating the Anti-Virus Packet Scan ....................................................	209
Chapter 13
Content Filtering ..................................................................................................	211
13.1 Content Filtering Overview ............................................................................	211
13.2 Configuring Keyword Blocking ......................................................................	211
13.3 Configuring the Schedule ..............................................................................	212

16 Table of Contents