ZyXEL Communications 662H Series, 662HW Series Chapter, Chapter, Chapter, Firewall Configuration

	Prestige 662H/HW Series User’s Guide
Chapter 12
Time and Date.......................................................................................................		142
12.1	Configuring Time and Date ............................................................................	142
Chapter 13
Firewalls................................................................................................................		144
13.1	Firewall Overview ...........................................................................................	144
13.2	Types of Firewalls ..........................................................................................	144
13.2.1 Packet Filtering Firewalls ......................................................................		144
13.2.2 Application-level Firewalls ....................................................................		144
13.2.3 Stateful Inspection Firewalls ................................................................		145
13.3	Introduction to ZyXEL’s Firewall .....................................................................	145
13.3.1 Denial of Service Attacks ......................................................................		146
13.4	Denial of Service ............................................................................................	146
13.4.1 Basics ...................................................................................................		146
13.4.2 Types of DoS Attacks ...........................................................................		147
	13.4.2.1 ICMP Vulnerability ......................................................................	149
	13.4.2.2 Illegal Commands (NetBIOS and SMTP) ....................................	149
	13.4.2.3 Traceroute ...................................................................................	150
13.5	Stateful Inspection ..........................................................................................	150
13.5.1 Stateful Inspection Process ..................................................................		151
13.5.2 Stateful Inspection and the Prestige .....................................................		152
13.5.3 TCP Security .........................................................................................		152
13.5.4 UDP/ICMP Security ..............................................................................		153
13.5.5 Upper Layer Protocols ..........................................................................		153
13.6	Guidelines for Enhancing Security with Your Firewall ....................................	154
13.6.1 Security In General ...............................................................................		154
13.7	Packet Filtering Vs Firewall ............................................................................	155
13.7.1 Packet Filtering: ....................................................................................		155
	13.7.1.1 When To Use Filtering .................................................................	155
13.7.2 Firewall .................................................................................................		155
	13.7.2.1 When To Use The Firewall ..........................................................	156
Chapter 14
Firewall Configuration .........................................................................................		158
14.1	Access Methods .............................................................................................	158
14.2	Firewall Policies Overview .............................................................................	158
14.3	Rule Logic Overview ......................................................................................	159
14.3.1 Rule Checklist .......................................................................................		159
14.3.2 Security Ramifications ..........................................................................		160
14.3.3 Key Fields For Configuring Rules .........................................................		160
	14.3.3.1 Action ..........................................................................................	160
	14.3.3.2 Service ........................................................................................	160