User's Guide

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Table Of Contents

Contents Overview
Table of Contents
Introduction
- 1.1 Overview
- 1.2 Applications
- 1.3 Ways to Manage the EMG1302-R10A
- 1.4 Good Habits for Managing the EMG1302-R10A
- 1.5 LEDs
- 1.6 The WPS Button
- 1.7 Wall Mounting
Introducing the Web Configurator
- 2.1 Overview
- 2.2 Login Accounts
- 2.3 Accessing the Web Configurator
- 2.4 Resetting the EMG1302-R10A
  - 2.4.1 Procedure to Use the RESET Button
Quick Start
- 3.1 Overview
- 3.2 Quick Start Setup
Monitor
- 4.1 Overview
- 4.2 What You Can Do
- 4.3 The Log Screen
  - 4.3.1 View Log
  - 4.3.2 Log Setting
- 4.4 DHCP Table
- 4.5 Packet Statistics
- 4.6 WLAN Station Status
Router Mode
- 5.1 Overview
- 5.2 Router Mode Status Screen
  - 5.2.1 Navigation Panel
Tutorials
- 6.1 Overview
- 6.2 Set Up a Wireless Network with WPS
  - 6.2.1 Push Button Configuration (PBC)
  - 6.2.2 PIN Configuration
- 6.3 Configure Wireless Security without WPS
  - 6.3.1 Configure Your Notebook
- 6.4 Using Multiple SSIDs on the EMG1302-R10A
  - 6.4.1 Configuring Security Settings of Multiple SSIDs
WAN
- 7.1 Overview
- 7.2 What You Can Do
- 7.3 What You Need To Know
  - 7.3.1 Configuring Your Internet Connection
  - 7.3.2 Multicast
- 7.4 Management WAN
  - 7.4.1 Add/Edit Internet Connection
  - 7.4.2 Bridge Encapsulation
- 7.5 Advanced WAN Screen
- 7.6 IPv6 Screen
Wireless LAN
- 8.1 Overview
- 8.2 What You Can Do
- 8.3 What You Should Know
- 8.4 General Wireless LAN Screen
- 8.5 Wireless Security
  - 8.5.1 No Security
  - 8.5.2 WPA2-PSK
- 8.6 More AP
  - 8.6.1 More AP Edit
- 8.7 MAC Filter
- 8.8 Wireless LAN Advanced Screen
- 8.9 Quality of Service (QoS) Screen
- 8.10 WPS Screen
- 8.11 WPS Station Screen
- 8.12 Scheduling Screen
- 8.13 WDS
LAN
- 9.1 Overview
- 9.2 What You Can Do
- 9.3 What You Need To Know
  - 9.3.1 IP Pool Setup
  - 9.3.2 LAN TCP/IP
- 9.4 LAN IP Screen
DHCP Server
- 10.1 Overview
- 10.2 What You Can Do
- 10.3 What You Need To Know
- 10.4 The DHCP General Screen
- 10.5 The DHCP Advanced Screen
- 10.6 The DHCP Client List Screen
Quality of Service (QoS)
- 11.1 Overview
  - 11.1.1 What You Can Do in the QoS Screens
  - 11.1.2 What You Need to Know About QoS
- 11.2 The Quality of Service General Screen
- 11.3 The Rule-based QoS Screen
  - 11.3.1 Adding a Rule
- 11.4 QoS Technical Reference
NAT
- 12.1 Overview
- 12.2 What You Can Do
- 12.3 What You Need To Know
- 12.4 The NAT General Screen
- 12.5 The NAT Port Forwarding Screen
- 12.6 The NAT Trigger Port Screen
- 12.7 The ALG Screen
DDNS
- 13.1 Overview
- 13.2 The DDNS General Screen
Routing
- 14.1 Overview
- 14.2 Static Route Screen
  - 14.2.1 Add/Edit Static Route Screen
- 14.3 The Dynamic Routing Screen
Interface Group
- 15.1 Overview
- 15.2 The Interface Group Screen
  - 15.2.1 Add Interface Group
Security
- 16.1 Overview
- 16.2 What You Can Do
- 16.3 What You Need To Know
- 16.4 The Firewall General Screen
- 16.5 The Firewall Services Screen
Content Filtering
- 17.1 Overview
- 17.2 What You Need To Know
- 17.3 Content Filter
IPv6 Firewall
- 18.1 Overview
- 18.2 The IPv6 Firewall Screen
Remote Management
- 19.1 Overview
- 19.2 What You Need to Know
  - 19.2.1 Remote Management and NAT
- 19.3 What You Can Do
- 19.4 The WWW Screen
- 19.5 The Telnet Screen
- 19.6 The SNMP Screen
- 19.7 The TR069 Screen
Universal Plug-and-Play (UPnP)
- 20.1 Overview
- 20.2 What You Need to Know
  - 20.2.1 NAT Traversal
  - 20.2.2 Cautions with UPnP
- 20.3 UPnP Screen
- 20.4 Technical Reference
  - 20.4.1 Using UPnP in Windows XP Example
  - 20.4.2 Web Configurator Easy Access
Maintenance
- 21.1 Overview
- 21.2 What You Can Do
- 21.3 General Screen
- 21.4 Account Screen
  - 21.4.1 Account Setup Screen
- 21.5 Time Setting Screen
- 21.6 Firmware Upgrade Screen
- 21.7 Configuration Backup/Restore Screen
- 21.8 Restart Screen
Troubleshooting
- 22.1 Overview
- 22.2 Power, Hardware Connections, and LEDs
- 22.3 EMG1302-R10A Access and Login
- 22.4 Internet Access
- 22.5 Resetting the EMG1302-R10A to Its Factory Defaults
- 22.6 Wireless Router/AP Troubleshooting
Customer Support
Pop-up Windows, JavaScript and Java Permissions
Wireless LANs
Common Services
Legal Information
Index

EMG1302-R10A User’s Guide 109

CHAPTER 12

NAT

12.1 Overview

NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP address of a host in

a packet. For example, the source address of an outgoing packet, used within one network is

changed to a different IP address known within another network.

The figure below is a simple illustration of a NAT network. You want to assign ports 21-25 to one,

Telnet and SMTP server (A in the example), port 80 to another (B in the example) and assign a

default server IP address of 192.168.1.35 to a third (C in the example).

You assign the LAN IP addresses to the devices (A to D) connected to your EMG1302-R10A. The ISP

assigns the WAN IP address. The NAT network appears as a single host on the Internet. All traffic

coming from A to D going out to the Internet use the IP address of the EMG1302-R10A, which is

192.168.1.1.

Figure 58 NAT Example

This chapter discusses how to configure NAT on the EMG1302-R10A.

Note: You must create a firewall rule in addition to setting up NAT, to allow traffic from

the WAN to be forwarded through the EMG1302-R10A.

12.2 What You Can Do

•Use the General screen to enable NAT (Section 12.4 on page 112).

A: 192.168.1.33

B: 192.168.1.34

C: 192.168.1.35

IP address

192.168.1.1

WANLAN

assigned by ISP

, Telnet, SNMP

Port 80

Ports 21 to 25