ZyXEL Communications P660HW-DX V2 - V3.40 User Manual page 14

Table of Contents
7.6 WMM QoS ......................................................................................................................... 122
7.6.1 WMM QoS Example ................................................................................................. 122
7.6.2 WMM QoS Priorities ................................................................................................. 122
7.6.3 Services ................................................................................................................... 123
7.7 QoS Screen ....................................................................................................................... 124
7.7.1 ToS (Type of Service) and WMM QoS ..................................................................... 125
7.7.2 Application Priority Configuration ............................................................................. 126
Chapter 8
Network Address Translation (NAT) Screens..................................................................... 129
8.1 NAT Overview ................................................................................................................... 129
8.1.1 NAT Definitions ........................................................................................................ 129
8.1.2 What NAT Does ....................................................................................................... 130
8.1.3 How NAT Works ....................................................................................................... 130
8.1.4 NAT Application ........................................................................................................ 130
8.1.5 NAT Mapping Types ................................................................................................. 131
8.2 SUA (Single User Account) Versus NAT ........................................................................... 132
8.3 SIP ALG ............................................................................................................................. 132
8.4 NAT General Setup ........................................................................................................... 133
8.5 Port Forwarding ................................................................................................................. 133
8.5.1 Default Server IP Address ........................................................................................ 134
8.5.2 Port Forwarding: Services and Port Numbers .......................................................... 134
8.5.3 Configuring Servers Behind Port Forwarding (Example) ......................................... 135
8.6 Configuring Port Forwarding ............................................................................................. 135
8.6.1 Port Forwarding Rule Edit ....................................................................................... 136
8.7 Address Mapping .............................................................................................................. 137
8.7.1 Address Mapping Rule Edit ..................................................................................... 139
Part IV: Security ................................................................................... 141
Chapter 9
Firewalls................................................................................................................................. 143
9.1 Firewall Overview ............................................................................................................. 143
9.2 Types of Firewalls .............................................................................................................. 143
9.2.1 Packet Filtering Firewalls ......................................................................................... 143
9.2.2 Application-level Firewalls ........................................................................................ 144
9.2.3 Stateful Inspection Firewalls ..................................................................................... 144
9.3 Introduction to ZyXEL's Firewall ........................................................................................ 144
9.3.1 Denial of Service Attacks ......................................................................................... 145
9.4 Denial of Service ............................................................................................................... 145
9.4.1 Basics ....................................................................................................................... 145
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P-660HW-Dx v2 User's Guide