User's Manual

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Table Of Contents

DSL-100HNU-T1 v3 User’s Guide
Contents
Introduction
- 1.1 Overview
- 1.2 Ways to Manage the Device
- 1.3 Good Habits for Managing the Device
- 1.4 Applications for the Device
  - 1.4.1 Internet Access
- 1.5 Wireless Access
  - 1.5.1 Using the WLAN/WPS Button
- 1.6 The RESET Button
  - 1.6.1 Using the Reset Button
- 1.7 LEDs (Lights)
Introducing the Web Configurator
- 2.1 Overview
  - 2.1.1 Accessing the Web Configurator
- 2.2 The Web Configurator Layout
  - 2.2.1 Title Bar
  - 2.2.2 Main Window
Quick Start
- 3.1 Overview
- 3.2 Quick Start Setup
Connection Status and System Info
- 4.1 Overview
- 4.2 The Connection Status Screen
- 4.3 The System Info Screen
WAN Setup
- 5.1 Overview
- 5.2 The Internet Connection Screen
  - 5.2.1 Advanced Internet Connection
- 5.3 The More Connections Screen
  - 5.3.1 More Connections Edit
  - 5.3.2 Configuring More Connections Advanced Setup
- 5.4 The 3G Backup Screen
- 5.5 WAN Technical Reference
Wireless
- 6.1 Overview
- 6.2 Wireless General Screen
- 6.3 More AP Screen
  - 6.3.1 Edit More AP
- 6.4 MAC Authentication Screen
- 6.5 The WPS Screen
- 6.6 The WDS Screen
- 6.7 The WMM Screen
- 6.8 Scheduling Screen
  - 6.8.1 Add or Edit Schedule
- 6.9 Advanced Screen
- 6.10 Technical Reference
Home Networking
- 7.1 Overview
  - 7.1.1 What You Can Do in this Chapter
  - 7.1.2 What You Need To Know
- 7.2 The LAN Setup Screen
- 7.3 The Static DHCP Screen
  - 7.3.1 Before You Begin
- 7.4 The IP Alias Screen
- 7.5 The UPnP Screen
- 7.6 The IPv6 LAN Setup Screen
- 7.7 The File Sharing Screen
  - 7.7.1 Before You Begin
  - 7.7.2 Edit File Sharing User
- 7.8 The Printer Server Screen
  - 7.8.1 Before You Begin
- 7.9 Technical Reference
- 7.10 Installing UPnP in Windows Example
- 7.11 Using UPnP in Windows XP Example
Static Route
- 8.1 Overview
  - 8.1.1 What You Can Do in this Chapter
- 8.2 Configuring Static Route
  - 8.2.1 Add/Edit Static Route
- 8.3 IPv6 Static Route
  - 8.3.1 IPv6 Static Route Edit
Quality of Service (QoS)
- 9.1 Overview
  - 9.1.1 What You Can Do in this Chapter
  - 9.1.2 What You Need to Know
- 9.2 The QoS General Screen
- 9.3 The Queue Setup Screen
  - 9.3.1 Edit a QoS Queue
- 9.4 The Class Setup Screen
  - 9.4.1 Add/Edit QoS Class
- 9.5 The QoS Policer Setup Screen
  - 9.5.1 Add/Edit a QoS Policer
- 9.6 The QoS Game List Screen
- 9.7 QoS Technical Reference
  - 9.7.1 DiffServ
Network Address Translation (NAT)
- 10.1 Overview
  - 10.1.1 What You Can Do in this Chapter
  - 10.1.2 What You Need To Know
- 10.2 The General Screen
- 10.3 The Port Forwarding Screen
  - 10.3.1 The Port Forwarding Screen
  - 10.3.2 The Port Forwarding Add/Edit Screen
- 10.4 The DMZ Screen
- 10.5 The ALG Screen
- 10.6 Technical Reference
Port Binding
- 11.1 Overview
- 11.2 The Port Binding Screen
  - 11.2.1 Port Binding Summary Screen
  - 11.2.2 The Any Port Any Service Edit Screen
Dynamic DNS
- 12.1 Overview
  - 12.1.1 What You Need To Know
- 12.2 The Dynamic DNS Screen
Filter
- 13.1 Overview
  - 13.1.1 What You Can Do in the Filter Screens
- 13.2 The IP/MAC Filter Screen
- 13.3 The IPv6/MAC Filter Screen
Firewall
- 14.1 Overview
  - 14.1.1 What You Can Do in the Firewall Screens
  - 14.1.2 What You Need to Know About Firewall
- 14.2 Firewall General Screen
- 14.3 Default Action Screen
- 14.4 Rules Screen
- 14.5 DoS Screen
  - 14.5.1 The DoS Advanced Screen
  - 14.5.2 Configuring Firewall Thresholds
- 14.6 Firewall Technical Reference
Parental Control
- 15.1 Overview
- 15.2 The Parental Control Screen
  - 15.2.1 Add/Edit a Parental Control Rule
Certificates
- 16.1 Overview
- 16.2 Local Certificates
- 16.3 Trusted CA
- 16.4 Trusted CA Import
- 16.5 View Certificate
System Monitor
- 17.1 Overview
  - 17.1.1 What You Can Do in this Chapter
  - 17.1.2 What You Need To Know
- 17.2 The Log Screen
- 17.3 The WAN Traffic Status Screen
- 17.4 The LAN Traffic Status Screen
- 17.5 The NAT Traffic Status Screen
User Account
- 18.1 Overview
- 18.2 The User Account Screen
TR-069 Client
- 19.1 Overview
- 19.2 The TR-069 Client Screen
System
- 20.1 Overview
- 20.2 The System Screen
Time Setting
- 21.1 Overview
- 21.2 The Time Setting Screen
Log Setting
- 22.1 Overview
- 22.2 The Log Setting Screen
Firmware Upgrade
- 23.1 Overview
- 23.2 The Firmware Upgrade Screen
Backup/Restore
- 24.1 Overview
- 24.2 The Backup/Restore Screen
- 24.3 The Reboot Screen
Remote Management
- 25.1 Overview
  - 25.1.1 What You Can Do in the Remote Management Screens
  - 25.1.2 What You Need to Know About Remote Management
- 25.2 The WWW Screen
  - 25.2.1 Configuring the WWW Screen
- 25.3 Telnet Screen
- 25.4 FTP Screen
- 25.5 SNMP Screen
  - 25.5.1 Configuring SNMP
- 25.6 DNS Screen
- 25.7 ICMP Screen
- 25.8 SSH Screen
  - 25.8.1 SSH Example
Diagnostic
- 26.1 Overview
  - 26.1.1 What You Can Do in the Diagnostic Screens
- 26.2 The Ping Screen
- 26.3 The DSL Line Screen
Troubleshooting
- 27.1 Overview
- 27.2 Power, Hardware Connections, and LEDs
- 27.3 Device Access and Login
- 27.4 Internet Access
- 27.5 Wireless Internet Access
- 27.6 USB Device Connection
- 27.7 UPnP
Legal Information

Chapter 10 Network Address Translation (NAT) 135

10.6.3 How NAT Works

Each packet has two addresses – a source address and a destination address. For outgoing packets,

the ILA (Inside Local Address) is the source address on the LAN, and the IGA (Inside Global Address)

is the source address on the WAN. For incoming packets, the ILA is the destination address on the

LAN, and the IGA is the destination address on the WAN. NAT maps private (local) IP addresses to

globally unique ones required for communication with hosts on other networks. It replaces the

original IP source address (and TCP or UDP source port numbers for Many-to-One and Many-to-

Many Overload NAT mapping) in each packet and then forwards it to the Internet. The Device keeps

track of the original addresses and port numbers so incoming reply packets can have their original

values restored. The following figure illustrates this.

Figure 88 Ho

w NAT Works

192.168.1.13

192.168.1.10

192.168.1.11

192.168.1.12

192.168.1.10

IGA1

Inside Local

IP Address

192.168.1.10

192.168.1.11

192.168.1.12

192.168.1.13

Inside Global

IP Address

IGA 1

IGA 2

IGA 3

IGA 4

NAT Table

WAN

LAN

Inside Local

Address (ILA)

Inside Global

Address (IGA)