IP Filtering Guide

Chapter 1 Using IP Filters

Introducing GTSecure IP Filters

Profile Overview

Filter Overview

Filter Properties

Pattern Matchers

Idle Timer

Actions

Entering IP Filtering Commands

IP Filtering Prompts

Entering Profile and Filter Names

Configuring IP Filters

IP Filter Commands

Firewall Scenario

Goals of the Firewall

Creating the Firewall Profile

Allowing Access to the Web Server

Allowing Internal Client Access to External Services

Preventing Spoofing of Source Addresses

Summary

Considering Classes of Traffic

Creating Profiles

Creating Sample Filters

Creating Filters for Clients Inside the Firewall

Allowing Public Clients to Access Servers Inside the Firewall

Creating a Filter for Authenticated Clients Outside the Firewall

Creating Filters for Internet Connectivity and ISP Management

Displaying All Examples

Using Event Logging System Messages

Displaying the ELS Prompts

Displaying ELS Messages for IP Filters

Turning on ELS Messages for IP Filters

Setting Up SNMP Traps

Testing a Filter

Testing a Filter That Blocks Packets

Opening a Hole in the Firewall Using the Authentication Process

Viewing the Authentication Process

Verifying the Filter