ZyXEL Communications HW-D Series, P-662H Chapter, Chapter, Firewall Configuration

P-662H/HW-D Series User’s Guide
9.3 NAT General Setup .........................................................................................	160
9.4 Port Forwarding ................................................................................................	161
9.4.1 Default Server IP Address ......................................................................	162
9.4.2 Port Forwarding: Services and Port Numbers ........................................	162
9.4.3 Configuring Servers Behind Port Forwarding (Example) ........................	163
9.5 Configuring Port Forwarding ...........................................................................	163
9.5.1 Port Forwarding Rule Edit .......................................................................	164
9.6 Address Mapping ............................................................................................	165
9.6.1 Address Mapping Rule Edit ....................................................................	167
Chapter 10
Firewalls................................................................................................................	169
10.1 Firewall Overview ..........................................................................................	169
10.2 Types of Firewalls ..........................................................................................	169
10.2.1 Packet Filtering Firewalls ......................................................................	169
10.2.2 Application-level Firewalls ....................................................................	170
10.2.3 Stateful Inspection Firewalls ................................................................	170
10.3 Introduction to ZyXEL’s Firewall .....................................................................	170
10.3.1 Denial of Service Attacks ......................................................................	171
10.4 Denial of Service ............................................................................................	171
10.4.1 Basics ...................................................................................................	171
10.4.2 Types of DoS Attacks ...........................................................................	172
10.4.2.1 ICMP Vulnerability ......................................................................	174
10.4.2.2 Illegal Commands (NetBIOS and SMTP) ....................................	174
10.4.2.3 Traceroute ...................................................................................	175
10.5 Stateful Inspection ..........................................................................................	175
10.5.1 Stateful Inspection Process ..................................................................	176
10.5.2 Stateful Inspection and the ZyXEL Device ............................................	176
10.5.3 TCP Security .........................................................................................	177
10.5.4 UDP/ICMP Security ..............................................................................	177
10.5.5 Upper Layer Protocols ..........................................................................	178
10.6 Guidelines for Enhancing Security with Your Firewall ....................................	178
10.6.1 Security In General ...............................................................................	179
10.7 Packet Filtering Vs Firewall ............................................................................	179
10.7.1 Packet Filtering: ....................................................................................	180
10.7.1.1 When To Use Filtering .................................................................	180
10.7.2 Firewall .................................................................................................	180
10.7.2.1 When To Use The Firewall ..........................................................	180
Chapter 11
Firewall Configuration .........................................................................................	181
11.1 Access Methods .............................................................................................	181
11.2 Firewall Policies Overview ..............................................................................	181

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