ZyXEL Communications P-660HW-TX V3 manual 15

	Table of Contents
9.3.1 Configuring the Port Forwarding Screen ..................................................................	175
9.3.2 The Port Forwarding Rule Edit Screen ....................................................................	177
9.4 The Address Mapping Screen ...........................................................................................	178
9.4.1 The Address Mapping Rule Edit Screen ..................................................................	179
9.5 The SIP ALG Screen .........................................................................................................	181
9.6 NAT Technical Reference ..................................................................................................	181
9.6.1 NAT Definitions ........................................................................................................	181
9.6.2 What NAT Does .......................................................................................................	182
9.6.3 How NAT Works .......................................................................................................	183
9.6.4 NAT Application ........................................................................................................	184
9.6.5 NAT Mapping Types .................................................................................................	184
Part IV: Security ...................................................................................	187
Chapter 10
Firewalls.................................................................................................................................	189
10.1 Overview ..........................................................................................................................	189
10.1.1 What You Can Do in the Firewall Screens .............................................................	189
10.1.2 What You Need to Know About Firewall ................................................................	190
10.1.3 Firewall Rule Setup Example .................................................................................	191
10.2 The Firewall General Screen ...........................................................................................	194
10.3 The Firewall Rule Screen ................................................................................................	196
10.3.1 Configuring Firewall Rules ....................................................................................	198
10.3.2 Customized Services ............................................................................................	200
10.3.3 Configuring a Customized Service .......................................................................	201
10.4 The Firewall Threshold Screen ........................................................................................	202
10.4.1 Threshold Values ...................................................................................................	202
10.4.2 Configuring Firewall Thresholds .............................................................................	203
10.5 Firewall Technical Reference ...........................................................................................	205
10.5.1 Firewall Rules Overview .........................................................................................	205
10.5.2 Guidelines For Enhancing Security With Your Firewall ..........................................	206
10.5.3 Security Considerations .........................................................................................	207
10.5.4 Triangle Route ........................................................................................................	207
Chapter 11
Content Filtering ...................................................................................................................	211
11.1 Overview ..........................................................................................................................	211
11.1.1 What You Can Do in the Content Filter Screens .....................................................	211
11.1.2 What You Need to Know About Content Filtering ....................................................	211
11.1.3 Before You Begin .....................................................................................................	211
11.1.4 Content Filtering Example ......................................................................................	212

	15
P-660HW-Tx v3 Series User’s Guide