NETGEAR DG834 - ADSL Firewall Router User manual

202-10005-05, June 2005
202-10005-05
June 2005
NETGEAR, Inc.
4500 Great America Parkway
Santa Clara, CA 95054 USA
Phone 1-888-NETGEAR
Reference Manual for the
ADSL Firewall Router
DG834

ii
202-10005-05, June 2005
© 2005 by NETGEAR, Inc. All rights reserved.
Trademarks
NETGEAR is a trademark of Netgear, Inc.
Microsoft, Windows, and Windows NT are registered trademarks of Microsoft Corporation.
Other brand and product names are registered trademarks or trademarks of their respective holders.
Statement of Conditions
In the interest of improving internal design, operational function, and/or reliability, NETGEAR reserves the right to
make changes to the products described in this document without notice.
NETGEAR does not assume any liability that may occur due to the use or application of the product(s) or circuit
layout(s) described herein.
Federal Communications Commission (FCC) Compliance Notice: Radio Frequency Notice
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to
part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try
to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
Federal Communications Commission (FCC) Radiation Exposure Statement
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. In order to avoid
the possibility of exceeding the FCC radio frequency exposure limits, human proximity to the antenna shall not be less
than 20 cm (8 inches) during normal operation.
EN 55 022 Declaration of Conformance
This is to certify that the DG834 ADSL Firewall Router is shielded against the generation of radio interference in
accordance with the application of Council Directive 89/336/EEC, Article 4a. Conformity is declared by the application
of EN 55 022 Class B (CISPR 22).
Bestätigung des Herstellers/Importeurs

202-10005-05, June 2005
iii
Es wird hiermit bestätigt, daß das DG834 ADSL Firewall Router gemäß der im BMPT-AmtsblVfg 243/1991 und Vfg
46/1992 aufgeführten Bestimmungen entstört ist. Das vorschriftsmäßige Betreiben einiger Geräte (z.B. Testsender) kann
jedoch gewissen Beschränkungen unterliegen. Lesen Sie dazu bitte die Anmerkungen in der Betriebsanleitung.
Das Bundesamt für Zulassungen in der Telekommunikation wurde davon unterrichtet, daß dieses Gerät auf den Markt
gebracht wurde und es ist berechtigt, die Serie auf die Erfüllung der Vorschriften hin zu überprüfen.
Certificate of the Manufacturer/Importer
It is hereby certified that the DG834 ADSL Firewall Router has been suppressed in accordance with the conditions set
out in the BMPT-AmtsblVfg 243/1991 and Vfg 46/1992. The operation of some equipment (for example, test
transmitters) in accordance with the regulations may, however, be subject to certain restrictions. Please refer to the notes
in the operating instructions.
Federal Office for Telecommunications Approvals has been notified of the placing of this equipment on the market
and has been granted the right to test the series for compliance with the regulations.
Voluntary Control Council for Interference (VCCI) Statement
This equipment is in the second category (information equipment to be used in a residential area or an adjacent area
thereto) and conforms to the standards set by the Voluntary Control Council for Interference by Data Processing
Equipment and Electronic Office Machines aimed at preventing radio interference in such residential areas.
When used near a radio or TV receiver, it may become the cause of radio interference.
Read instructions for correct handling.
Customer Support
Refer to the Support Information Card that shipped with your DG834 ADSL Firewall Router.
World Wide Web
NETGEAR maintains a World Wide Web home page that you can access at the universal resource locator (URL)
http://www.netgear.com. A direct connection to the Internet and a Web browser such as Internet Explorer
or Netscape are required.
Product and Publication Details
Model Number: DG834
Publication Date: June 2005
Product Family: router
Product Name: DG834 ADSL Firewall Router
Home or Business Product: Business
Language: English
Publication Part Number: 202-10005-05

202-10005-05, June 2005
iv

Contents v
202-10005-05, June 2005
Contents
Chapter 1
About This Manual
Audience, Scope, Conventions, and Formats ................................................................1-1
How to Use This Manual ................................................................................................1-2
How to Print this Manual .................................................................................................1-3
Chapter 2
Introduction
About the Router ............................................................................................................2-1
Key Features ..................................................................................................................2-1
A Powerful, True Firewall .........................................................................................2-2
Easy Installation and Management ..........................................................................2-2
Protocol Support ......................................................................................................2-3
Virtual Private Networking (VPN) .............................................................................2-4
Content Filtering .......................................................................................................2-4
Auto Sensing and Auto Uplink™ LAN Ethernet Connections ..................................2-5
What’s in the Box? ..........................................................................................................2-5
The Router’s Front Panel .........................................................................................2-5
The Router’s Rear Panel .........................................................................................2-6
Chapter 3
Connecting the Router to the Internet
What You Need Before You Begin ..................................................................................3-1
ADSL Microfilter Requirements ................................................................................3-1
ADSL Microfilter .................................................................................................3-1
ADSL Microfilter with Built-In Splitter .................................................................3-2
Ethernet Cabling Requirements ...............................................................................3-2
Computer Hardware Requirements .........................................................................3-2
LAN Configuration Requirements ............................................................................3-2
Internet Configuration Requirements .......................................................................3-3
Where Do I Get the Internet Configuration Parameters? .........................................3-3

202-10005-05, June 2005
vi Contents
Record Your Internet Connection Information ..........................................................3-3
Connecting the DG834 to Your LAN ...............................................................................3-4
How to Connect the Router ......................................................................................3-5
Auto-Detecting Your Internet Connection Type ..............................................................3-9
Wizard-Detected PPPoE Login Account Setup ......................................................3-10
Wizard-Detected PPPoA Login Account Setup ......................................................3-11
Wizard-Detected Dynamic IP Account Setup .........................................................3-11
Wizard-Detected IP Over ATM Account Setup ......................................................3-12
Wizard-Detected Fixed IP (Static) Account Setup ..................................................3-13
Testing Your Internet Connection ..................................................................................3-14
Manually Configuring Your Internet Connection ...........................................................3-14
How to Perform Manual Configuration ...................................................................3-15
Internet Connection Requires Login and Uses PPPoE ...................................3-16
Internet Connection Requires Login and Uses PPPoA ...................................3-17
Internet Connection Does Note Require A Login ............................................3-18
ADSL Settings ........................................................................................................3-19
Chapter 4
Protecting Your Network
Protecting Access to Your DG834 ADSL Firewall Router ...............................................4-1
How to Change the Built-In Password .....................................................................4-1
Changing the Administrator Login Timeout ..............................................................4-2
Configuring Basic Firewall Services ...............................................................................4-2
Blocking Keywords, Sites, and Services ..................................................................4-3
How to Block Keywords and Sites ...........................................................................4-3
Firewall Rules .................................................................................................................4-5
Inbound Rules (Port Forwarding) .............................................................................4-6
Inbound Rule Example: A Local Public Web Server ..........................................4-6
Inbound Rule Example: Allowing Videoconferencing ........................................4-8
Considerations for Inbound Rules .....................................................................4-8
Outbound Rules (Service Blocking) .........................................................................4-9
Outbound Rule Example: Blocking Instant Messenger .....................................4-9
Order of Precedence for Rules ..............................................................................4-11
Services ........................................................................................................................4-12
How to Define Services ..........................................................................................4-12
Setting Times and Scheduling Firewall Services ..........................................................4-13

Contents vii
202-10005-05, June 2005
How to Set Your Time Zone ...................................................................................4-13
How to Schedule Firewall Services ........................................................................4-14
Chapter 5
Managing Your Network
Backing Up, Restoring, or Erasing Your Settings ...........................................................5-1
How to Back Up the Configuration to a File .............................................................5-1
How to Restore the Configuration from a File ..........................................................5-2
How to Erase the Configuration ...............................................................................5-2
Upgrading the Router’s Firmware ...................................................................................5-2
How to Upgrade the Router Firmware .....................................................................5-3
Network Management Information .................................................................................5-4
Viewing Router Status and Usage Statistics ............................................................5-4
Viewing Attached Devices ........................................................................................5-9
Viewing, Selecting, and Saving Logged Information ................................................5-9
Selecting What Information to Log ..................................................................5-11
Saving Log Files on a Server ..........................................................................5-12
Examples of Log Messages ...................................................................................5-12
Activation and Administration ..........................................................................5-12
Dropped Packets .............................................................................................5-12
Enabling Security Event E-mail Notification .................................................................5-13
Running Diagnostic Utilities and Rebooting the Router ................................................5-14
Enabling Remote Management ....................................................................................5-15
Configuring Remote Management .........................................................................5-15
Chapter 6
Advanced Configuration
Configuring Advanced Security ......................................................................................6-1
Setting Up A Default DMZ Server ............................................................................6-1
How to Configure a Default DMZ Server ...........................................................6-2
Connect Automatically, as Required ........................................................................6-3
Disable Port Scan and DOS Protection ...................................................................6-3
Respond to Ping on Internet WAN Port ...................................................................6-3
MTU Size .................................................................................................................6-3
Configuring LAN IP Settings ...........................................................................................6-3
DHCP .......................................................................................................................6-5
Use Router as DHCP server .............................................................................6-5

202-10005-05, June 2005
viii Contents
Reserved IP addresses .....................................................................................6-6
How to Configure LAN TCP/IP Settings ...................................................................6-7
Configuring Dynamic DNS .......................................................................................6-7
How to Configure Dynamic DNS ..............................................................................6-8
Using Static Routes ........................................................................................................6-9
Static Route Example ...............................................................................................6-9
How to Configure Static Routes .............................................................................6-10
Universal Plug and Play (UPnP) ...................................................................................6-12
Chapter 7
Virtual Private Networking (Advanced Feature)
Overview of VPN Configuration ......................................................................................7-2
Client-to-Gateway VPN Tunnels ..............................................................................7-2
Gateway-to-Gateway VPN Tunnels .........................................................................7-2
Planning a VPN ..............................................................................................................7-3
VPN Tunnel Configuration ..............................................................................................7-6
How to Set Up a Client-to-Gateway VPN Configuration .................................................7-6
Step 1: Configuring the Client-to-Gateway VPN Tunnel on the DG834 ...................7-7
Step 2: Configuring the NETGEAR ProSafe VPN Client on the Remote PC .........7-12
How to Set Up a Gateway-to-Gateway VPN Configuration ..........................................7-20
VPN Tunnel Control ......................................................................................................7-27
Activating a VPN Tunnel ........................................................................................7-27
Using the VPN Status Page to Activate a VPN Tunnel ....................................7-27
Activate the VPN Tunnel by Pinging the Remote Endpoint .............................7-28
Start Using a VPN Tunnel to Active It ..............................................................7-30
Verifying the Status of a VPN Tunnel .....................................................................7-30
Deactivating a VPN Tunnel ....................................................................................7-32
Using the Policy Table on the VPN Policies Page to Deactivate a VPN Tunnel 7-32
Using the VPN Status Page to Deactivate a VPN Tunnel ...............................7-33
Deleting a VPN Tunnel ...........................................................................................7-35
How to Set Up VPN Tunnels in Special Circumstances ...............................................7-35
Using Auto Policy to Configure VPN Tunnels ........................................................7-36
Configuring VPN Network Connection Parameters .........................................7-36
Example of Using Auto Policy .........................................................................7-41
Using Manual Policy to Configure VPN Tunnels ....................................................7-48

Contents ix
202-10005-05, June 2005
Chapter 8
Troubleshooting
Basic Functioning ...........................................................................................................8-1
Power LED Not On ...................................................................................................8-2
Test LED Never Turns On or Test LED Stays On .....................................................8-2
LAN or WAN Port LEDs Not On ...............................................................................8-2
Troubleshooting the Web Configuration Interface ..........................................................8-3
Troubleshooting the ISP Connection ..............................................................................8-4
ADSL link .................................................................................................................8-4
WAN LED Blinking Yellow ..................................................................................8-4
WAN LED Off .....................................................................................................8-4
Obtaining a WAN IP Address ...................................................................................8-5
Troubleshooting PPPoE or PPPoA ..........................................................................8-6
Troubleshooting Internet Browsing ..........................................................................8-6
Troubleshooting a TCP/IP Network Using the Ping Utility ..............................................8-7
Testing the LAN Path to Your Router .......................................................................8-7
Testing the Path from Your Computer to a Remote Device .....................................8-8
Restoring the Default Configuration and Password ........................................................8-9
Using the Reset button .............................................................................................8-9
Problems with Date and Time .........................................................................................8-9
Appendix A
Technical Specifications
Appendix B
Network and Routing Basics
Related Publications ...................................................................................................... B-1
Basic Router Concepts .................................................................................................. B-1
What is a Router? ................................................................................................... B-1
Routing Information Protocol ................................................................................... B-2
IP Addresses and the Internet ................................................................................. B-2
Netmask .................................................................................................................. B-4
Subnet Addressing .................................................................................................. B-4
Private IP Addresses ............................................................................................... B-7
Single IP Address Operation Using NAT ................................................................. B-7
MAC Addresses and Address Resolution Protocol ................................................. B-8
Related Documents ................................................................................................. B-9

202-10005-05, June 2005
xContents
Domain Name Server .............................................................................................. B-9
IP Configuration by DHCP ...................................................................................... B-9
Internet Security and Firewalls .................................................................................... B-10
What is a Firewall? ................................................................................................ B-10
Stateful Packet Inspection ..................................................................................... B-10
Denial of Service Attack .........................................................................................B-11
Ethernet Cabling ...........................................................................................................B-11
Category 5 Cable Quality .......................................................................................B-11
Inside Twisted Pair Cables .................................................................................... B-12
Uplink Switches, Crossover Cables, and MDI/MDIX Switching ............................ B-13
Appendix C
Preparing Your Network
Preparing Your Computers for TCP/IP Networking .......................................................C-1
Configuring Windows 95, 98, and Me for TCP/IP Networking .......................................C-2
Installing or Verifying Windows Networking Components .......................................C-2
Enabling DHCP to Automatically Configure TCP/IP Settings in Windows 95B, 98, and Me
C-4
Selecting the Windows’ Internet Access Method ....................................................C-6
Verifying TCP/IP Properties ....................................................................................C-6
Configuring Windows NT4, 2000 or XP for IP Networking ............................................C-7
Installing or Verifying Windows Networking Components .......................................C-7
DHCP Configuration of TCP/IP in Windows XP, 2000, or NT4 ......................................C-8
DHCP Configuration of TCP/IP in Windows XP .....................................................C-8
DHCP Configuration of TCP/IP in Windows 2000 ................................................C-10
DHCP Configuration of TCP/IP in Windows NT4 ..................................................C-13
Verifying TCP/IP Properties for Windows XP, 2000, and NT4 ..............................C-15
Configuring the Macintosh for TCP/IP Networking ......................................................C-16
MacOS 8.6 or 9.x ..................................................................................................C-16
MacOS X ...............................................................................................................C-16
Verifying TCP/IP Properties for Macintosh Computers .........................................C-17
Verifying the Readiness of Your Internet Account .......................................................C-18
Are Login Protocols Used? ...................................................................................C-18
What Is Your Configuration Information? ..............................................................C-18
Obtaining ISP Configuration Information for Windows Computers .......................C-19
Obtaining ISP Configuration Information for Macintosh Computers .....................C-20
Restarting the Network ................................................................................................C-21

Contents xi
202-10005-05, June 2005
Appendix D
Virtual Private Networking
What is a VPN? .............................................................................................................D-1
What Is IPSec and How Does It Work? .........................................................................D-2
IPSec Security Features .........................................................................................D-2
IPSec Components .................................................................................................D-2
Encapsulating Security Payload (ESP) ...................................................................D-3
Authentication Header (AH) ....................................................................................D-4
IKE Security Association .........................................................................................D-4
Mode .................................................................................................................D-5
Key Management ....................................................................................................D-6
Understand the Process Before You Begin ...................................................................D-6
VPN Process Overview .................................................................................................D-7
Network Interfaces and Addresses .........................................................................D-7
Interface Addressing .........................................................................................D-7
Firewalls ...........................................................................................................D-8
Setting Up a VPN Tunnel Between Gateways ........................................................D-8
VPNC IKE Security Parameters ..................................................................................D-10
VPNC IKE Phase I Parameters .............................................................................D-10
VPNC IKE Phase II Parameters ............................................................................ D-11
Testing and Troubleshooting ........................................................................................ D-11
Additional Reading ...................................................................................................... D-11
Appendix E
NETGEAR VPN Configuration
DG834 to FVL328 .......................................................................................................... E-1
Configuration Profile ................................................................................................ E-1
Step-By-Step Configuration ..................................................................................... E-2
DG834 with FQDN to FVL328 ....................................................................................... E-6
Configuration Profile ................................................................................................ E-6
The Use of a Fully Qualified Domain Name (FQDN) ........................................ E-7
Step-By-Step Configuration ..................................................................................... E-8
Configuration Summary (Telecommuter Example) ...................................................... E-13
Setting Up the Client-to-Gateway VPN Configuration (Telecommuter Example) ........ E-14
Step 1: Configuring the Client-to-Gateway VPN Tunnel on the VPN Router at the
Employer’s Main Office ......................................................................................... E-15

202-10005-05, June 2005
xii Contents
Step 2: Configuring the NETGEAR ProSafe VPN Client on the Remote PC at the
Telecommuter’s Home Office ................................................................................ E-17
Monitoring the VPN Tunnel (Telecommuter Example) ................................................. E-26
Viewing the PC Client’s Connection Monitor and Log Viewer ............................... E-26
Viewing the VPN Router’s VPN Status and Log Information ................................ E-28
Glossary

About This Manual 1-1
202-10005-05, June 2005
Chapter 1
About This Manual
This chapter describes the intended audience, scope, conventions, and formats of this manual.
Audience, Scope, Conventions, and Formats
This reference manual assumes that the reader has basic to intermediate computer and Internet
skills. However, basic computer network, Internet, firewall, and VPN technologies tutorial
information is provided in the Appendices and on the Netgear website.
This guide uses the following typographical conventions:
This guide uses the following formats to highlight special messages:
This manual is written for the DG834 ADSL router according to these specifications:
Table 1-1. Typographical Conventions
italics Emphasis, books, CDs, URL names
bold User input
fixed Screen text, file and server names, extensions, commands, IP addresses
Note: This format is used to highlight information of importance or special interest.
Table 1-2. Manual Scope
Product Version DG834 ADSL Firewall Router
Manual Publication Date June 2005
Note: Product updates are available on the NETGEAR, Inc. Web site at
http://kbserver.netgear.com/products/DG834.asp.

Reference Manual for the ADSL Firewall Router DG834
1-2 About This Manual
202-10005-05, June 2005
How to Use This Manual
The HTML version of this manual includes the following:
• Buttons, and , for browsing forwards or backwards through the manual one page
at a time
• A button that displays the table of contents and an button. Double-click on a
link in the table of contents or index to navigate directly to where the topic is described in the
manual.
• A button to access the full NETGEAR, Inc. online knowledge base for the
product model.
• Links to PDF versions of the full manual and individual chapters.

Reference Manual for the ADSL Firewall Router DG834
About This Manual 1-3
202-10005-05, June 2005
How to Print this Manual
To print this manual you can choose one of the following several options, according to your needs.
•Printing a Page in the HTML View.
Each page in the HTML version of the manual is dedicated to a major topic. Use the Print
button on the browser toolbar to print the page contents.
•Printing a Chapter.
Use the PDF of This Chapter link at the top left of any page.
– Click the PDF of This Chapter link at the top right of any page in the chapter you want to
print. The PDF version of the chapter you were viewing opens in a browser window.
Note: Your computer must have the free Adobe Acrobat reader installed in order to view
and print PDF files. The Acrobat reader is available on the Adobe Web site at
http://www.adobe.com.
– Click the print icon in the upper left of the window.
Tip: If your printer supports printing two pages on a single sheet of paper, you can save
paper and printer ink by selecting this feature.
•Printing the Full Manual.
Use the Complete PDF Manual link at the top left of any page.
– Click the Complete PDF Manual link at the top left of any page in the manual. The PDF
version of the complete manual opens in a browser window.
– Click the print icon in the upper left of the window.
Tip: If your printer supports printing two pages on a single sheet of paper, you can save
paper and printer ink by selecting this feature.

Reference Manual for the ADSL Firewall Router DG834
1-4 About This Manual
202-10005-05, June 2005

Introduction 2-1
202-10005-05, June 2005
Chapter 2
Introduction
This chapter describes the features of the NETGEAR DG834 ADSL Firewall Router. The DG834
ADSL router is a combination of a built-in ADSL modem, router, 4-port switch, and firewall
which enables your entire network to safely share an Internet connection that otherwise is used by
a single computer.
About the Router
The DG834 ADSL Firewall Router provides continuous, high-speed 10/100 Ethernet access
between your Ethernet devices. The DG834 ADSL router enables your entire network to share an
Internet connection through the built-in ADSL modem that otherwise is used by a single computer.
With minimum setup, you can install and use the router within minutes.
The DG834 ADSL router provides multiple Web content filtering options, plus e-mail browsing
activity, reporting, and instant alerts. Parents and network administrators can establish restricted
access policies based on time of day, Web site addresses, and address keywords. They can also
share high-speed ADSL Internet access for up to 253 personal computers. The included firewall
and Network Address Translation (NAT) features protect you from hackers.
Key Features
The DG834 ADSL router provides the following features:
• A built-in ADSL modem
• A powerful, true firewall
• Easy, Web-based setup for installation and management
Note: If you are unfamiliar with networking and routing, refer to Appendix B, “Network
and Routing Basics” to become more familiar with the terms and procedures used in this
manual.

Reference Manual for the ADSL Firewall Router DG834
2-2 Introduction
202-10005-05, June 2005
• Extensive Internet protocol support
• Trustworthy VPN Communications over the Internet
• VPN Wizard for easy VPN configuration
• Content filtering
• Auto Sensing and Auto Uplink™ LAN Ethernet connections
These features are discussed below.
A Powerful, True Firewall
Unlike simple Internet sharing NAT routers, the DG834 is a true firewall, using stateful packet
inspection to defend against hacker attacks. Its firewall features include:
• Denial of Service (DoS) protection
Automatically detects and thwarts Denial of Service (DoS) attacks such as Ping of Death,
SYN Flood, LAND Attack and IP Spoofing.
• Blocks unwanted traffic from the Internet to your LAN.
• Blocks access from your LAN to Internet locations or services that you specify as off-limits.
• Logs security incidents
The DG834 will log security events such as blocked incoming traffic, port scans, attacks, and
administrator logins. You can configure the router to email the log to you at specified intervals.
You can also configure the router to send immediate alert messages to your email address or
email pager whenever a significant event occurs.
Easy Installation and Management
You can install, configure, and operate the DG834 within minutes after connecting it to the
network. The following features simplify installation and management tasks:
• Browser-based management
Browser-based configuration allows you to easily configure your router from almost any type
of personal computer, such as Windows, Macintosh, or Linux. A user-friendly Setup Wizard is
provided and online help documentation is built into the browser-based Web Management
Interface.
• Smart Wizard
The router automatically senses the type of Internet connection, asking you only for the
information required for your type of ISP account.

Reference Manual for the ADSL Firewall Router DG834
Introduction 2-3
202-10005-05, June 2005
• Remote management
The router allows you to log in to the Web management interface from a remote location via
the Internet. For security, you can limit remote management access to a specified remote IP
address or range of addresses, and you can choose a nonstandard port number.
• Diagnostic functions
The router incorporates built-in diagnostic functions such as Ping, DNS lookup, and remote
reboot. These functions allow you to test Internet connectivity and reboot the router. You can
use these diagnostic functions directly from the DG834 when you are connected on the LAN
or when you are connected over the Internet via the remote management function.
• Visual monitoring
The router’s front panel LEDs provide an easy way to monitor its status and activity.
• Flash erasable programmable read-only memory (EPROM) for firmware upgrades.
Protocol Support
The DG834 supports Transmission Control Protocol/Internet Protocol (TCP/IP) and Routing
Information Protocol (RIP). Appendix B, “Network and Routing Basics” provides further
information on TCP/IP.
• The Ability to Enable or Disable IP Address Sharing by NAT
The DG834 allows several networked PCs to share an Internet account using only a single IP
address, which may be statically or dynamically assigned by your Internet service provider
(ISP). This technique, known as Network Address Translation (NAT), allows the use of an
inexpensive single-user ISP account. This feature can also be turned off completely while
using the DG834 if you want to manage the IP address scheme yourself.
• Automatic Configuration of Attached PCs by DHCP
The DG834 dynamically assigns network configuration information, including IP, router, and
domain name server (DNS) addresses, to attached PCs on the LAN using the Dynamic Host
Configuration Protocol (DHCP). This feature greatly simplifies configuration of PCs on your
local network.
• DNS Proxy
When DHCP is enabled and no DNS addresses are specified, the router provides its own
address as a DNS server to the attached PCs. The router obtains actual DNS addresses from
the ISP during connection setup and forwards DNS requests from the LAN.
• Classical IP (RFC 1577)
Some Internet service providers, in Europe for example, use Classical IP in their ADSL
services. In such cases, the router is able to use the Classical IP address from the ISP.

Reference Manual for the ADSL Firewall Router DG834
2-4 Introduction
202-10005-05, June 2005
• PPP over Ethernet (PPPoE)
PPP over Ethernet is a protocol for connecting remote hosts to the Internet over an ADSL
connection by simulating a dial-up connection. This feature eliminates the need to run a login
program such as EnterNet or WinPOET on your computer.
• PPP over ATM (PPPoA)
PPP over ATM is a protocol for connecting remote hosts to the Internet over an ADSL
connection by simulating an ATM connection.
• Dynamic DNS
Dynamic DNS services allow remote users to find your network using a domain name when
your IP address is not permanently assigned. The router contains a client that can connect to
many popular Dynamic DNS services to register your dynamic IP address.
• Universal Plug and Play (UPnP)
UPnP is a networking architecture that provides compatibility between networking
technologies. UPnP compliant routers provide broadband users at home and small businesses
with a seamless way to participate in online games, videoconferencing and other peer-to-peer
services.
Virtual Private Networking (VPN)
The DG834 ADSL router provides a secure encrypted connection between your local area network
(LAN) and remote networks or clients. It includes the following VPN features:
• Supports 8 VPN connections.
• Supports industry standard VPN protocols
The DG834 ADSL router supports standard Manual or IKE keying methods, standard MD5
and SHA-1 authentication methods, and standard DES and 3DES encryption methods. It is
compatible with many other VPN products.
• Supports 3DES encryption for maximum security.
• VPN Wizard based on VPNC recommended settings.
Content Filtering
With its content filtering feature, the DG834 prevents objectionable content from reaching your
PCs. The router allows you to control access to Internet content by screening for keywords within
Web addresses. You can configure the router to log and report attempts to access objectionable
Internet sites.