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

Chapter 12 NAT

EMG1302-R10A User’s Guide

110

•Use the Port Forwarding screen to change your EMG1302-R10A’s port forwarding settings

(Section 12.5 on page 112).

•Use the Port Trigger screen to view and configure your EMG1302-R10A’s trigger port settings

(Section 12.5 on page 112).

•Use the ALG screen to

12.3 What You Need To Know

The following terms and concepts may help as you read through this chapter.

Inside/Outside

This denotes where a host is located relative to the EMG1302-R10A, for example, the computers of

your subscribers are the inside hosts, while the web servers on the Internet are the outside hosts.

Global/Local

This denotes the IP address of a host in a packet as the packet traverses a router, for example, the

local address refers to the IP address of a host when the packet is in the local network, while the

global address refers to the IP address of the host when the same packet is traveling in the WAN

side.

Note: Inside/outside refers to the location of a host, while global/local refers to the IP

address of a host used in a packet.

An inside local address (ILA) is the IP address of an inside host in a packet when the packet is still

in the local network, while an inside global address (IGA) is the IP address of the same inside host

when the packet is on the WAN side. The following table summarizes this information.

Note: NAT never changes the IP address (either local or global) of an outside host.

What NAT Does

In the simplest form, NAT changes the source IP address in a packet received from a subscriber

(the inside local address) to another (the inside global address) before forwarding the packet to the

WAN side. When the response comes back, NAT translates the destination address (the inside

Table 41 NAT Definitions

ITEM DESCRIPTION

Inside This refers to the host on the LAN.

Outside This refers to the host on the WAN.

Local This refers to the packet address (source or

destination) as the packet travels on the LAN.

Global This refers to the packet address (source or

destination) as the packet travels on the WAN.