ZyXEL Communications Wireless Gateway Series Chapter 12 Firewall Screens

ZyAIR Wireless Gateway Series User’s Guide

Chapter 11 Introduction to Firewalls.......................................................................................................			11-1
11.1	Firewall Overview ...................................................................................................................		11-1
11.2	Types of Firewalls....................................................................................................................		11-1
11.2.1		Packet Filtering Firewalls ................................................................................................	11-1
11.2.2		Application-level Firewalls..............................................................................................	11-1
11.2.3		Stateful Inspection Firewalls............................................................................................	11-2
11.3	Introduction to ZyXEL’s Firewall ...........................................................................................		11-2
11.4	Denial of Service .....................................................................................................................		11-2
11.4.1		Basics...............................................................................................................................	11-3
11.4.2 Types of DoS Attacks ......................................................................................................			11-4
11.5	Stateful Inspection ...................................................................................................................		11-7

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
12.3.1		Rule Checklist..................................................................................................................	12-2
12.3.2		Security Ramifications.....................................................................................................	12-2
12.3.3 Key Fields For Configuring Rules ...................................................................................			12-3
12.4	Guidelines For Enhancing Security With Your Firewall .........................................................		12-3
12.5	Connection Direction Examples ..............................................................................................		12-4
12.5.1 LAN to WAN Rules.........................................................................................................			12-4
12.5.2 WAN to LAN Rules.........................................................................................................			12-5
12.6	Enabling Firewall.....................................................................................................................		12-6
12.6.1		Configuring Content Filtering..........................................................................................	12-8
12.6.2		Configuring Firewall Services .......................................................................................	12-11
12.6.3		Predefined Services........................................................................................................	12-13

Chapter 13 Remote Management.............................................................................................................			13-1
13.1	Remote Management Overview...............................................................................................		13-1
13.1.1		Remote Management Limitations....................................................................................	13-1
13.1.2 Remote Management and NAT .......................................................................................			13-2
13.1.3		System Timeout ...............................................................................................................	13-2
13.2	Telnet .......................................................................................................................................		13-2
13.3	Configuring TELNET..............................................................................................................		13-3
13.4	Configuring FTP ......................................................................................................................		13-4
13.5	Configuring WWW..................................................................................................................		13-5
13.6	Configuring SNMP ..................................................................................................................		13-6
13.6.1		Supported MIBs...............................................................................................................	13-8
13.6.2		SNMP Traps ....................................................................................................................	13-8
13.6.3		REMOTE MANAGEMENT: SNMP ..............................................................................	13-9
13.7	Configuring DNS...................................................................................................................		13-10
13.8	Configuring Security..............................................................................................................		13-11

x Table of Contents