ZyXEL Communications ZyWALL5UTM 4.0 manual 13

ZyWALL 5/35/70 Series User’s Guide

9.11.2 Encryption .............................................................................................		183
9.12	WPA-PSK Application Example .....................................................................	184
9.13	Introduction to RADIUS ..................................................................................	185
9.14	WPA with RADIUS Application Example ........................................................	185
9.15	Wireless Client WPA Supplicants ...................................................................	186
9.16.1 Static WEP ............................................................................................		188
9.16.2 WPA-PSK .............................................................................................		189
9.16.3 WPA ......................................................................................................		191
9.16.4 IEEE 802.1x + Dynamic WEP ..............................................................		192
9.16.5 IEEE 802.1x + Static WEP ....................................................................		193
9.16.6 IEEE 802.1x + No WEP ........................................................................		194
9.16.7 No Access 802.1x + Static WEP ...........................................................		195
9.16.8 No Access 802.1x + No WEP ...............................................................		196
Chapter 10
Firewalls................................................................................................................		198
10.1	Firewall Overview ...........................................................................................	198
10.2	Types of Firewalls ..........................................................................................	198
10.2.1 Packet Filtering Firewalls ......................................................................		198
10.2.2 Application-level Firewalls ....................................................................		198
10.2.3 Stateful Inspection Firewalls .................................................................		199
10.3	Introduction to ZyXEL’s Firewall .....................................................................	199
10.4	Denial of Service ............................................................................................	200
10.4.1 Basics ...................................................................................................		200
10.4.2 Types of DoS Attacks ...........................................................................		201
	10.4.2.1 ICMP Vulnerability ......................................................................	203
	10.4.2.2 Illegal Commands (NetBIOS and SMTP) ....................................	203
	10.4.2.3 Traceroute ...................................................................................	204
10.5	Stateful Inspection ..........................................................................................	204
10.5.1 Stateful Inspection Process ..................................................................		205
10.5.2 Stateful Inspection and the ZyWALL .....................................................		206
10.5.3 TCP Security .........................................................................................		206
10.5.4 UDP/ICMP Security ..............................................................................		207
10.5.5 Upper Layer Protocols ..........................................................................		207
10.6	Guidelines For Enhancing Security With Your Firewall ..................................	208
10.7	Packet Filtering Vs Firewall ............................................................................	208
10.7.1 Packet Filtering: ....................................................................................		208
	10.7.1.1 When To Use Filtering .................................................................	208
10.7.2 Firewall .................................................................................................		209
	10.7.2.1 When To Use The Firewall ..........................................................	209

13 Table of Contents