ZyXEL Communications Internet Security Gateway ZyWALL 100, User Manual

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ZyWALL Series Internet Security Gateway
xii Table of Contents
11.2 Types of Firewalls.................................................................................................................11-1
11.3 Introduction to ZyXEL’s Firewall ........................................................................................11-2
11.4 Denial of Service...................................................................................................................11-3
11.5 Stateful Inspection ................................................................................................................11-7
11.6 Guidelines For Enhancing Security With Your Firewall ....................................................11-11
11.7 Packet Filtering Vs Firewall ...............................................................................................11-12
Chapter 12 Firewall Screens..................................................................................................................12-1
12.1 Access Methods ....................................................................................................................12-1
12.2 Firewall Policies Overview...................................................................................................12-1
12.3 Rule Logic Overview............................................................................................................12-2
12.4 Connection Direction Examples ...........................................................................................12-4
12.5 Bandwidth Management - Lite .............................................................................................12-5
12.6 Bandwidth Management Usage Examples............................................................................12-5
12.7 Alerts.....................................................................................................................................12-7
12.8 Configuring Firewall.............................................................................................................12-7
12.9 Example Firewall Rule .......................................................................................................12-17
12.10 Predefined Services.............................................................................................................12-21
12.11 Configuring Attack Alert ....................................................................................................12-24
Chapter 13 Content Filtering Screens ..................................................................................................13-1
13.1 Content Filtering Overview ..................................................................................................13-1
13.2 General Content Filter Configuration ...................................................................................13-1
13.3 Content Filtering with an External Server ............................................................................13-4
13.4 A Procedure to Enable External Database Content Filtering ................................................13-5
13.5 Checking Content Filtering Activation .................................................................................13-6
13.6 Configuring Categories.........................................................................................................13-6
13.7 Configuring Customization.................................................................................................13-15
VPN/IPSec ......................................................................................................................................................VI
Chapter 14 Introduction to IPSec .........................................................................................................14-1