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CONTENTS
ABOUT THIS GUIDE
Naming Convention7
Conventions8
Feedback About This User Guide9
Related Documentation9
INTRODUCINGTHE ROUTER
Wireless 11n Cable/DSL Firewall Router11
Router Advantages13
Package Contents13
Minimum System and Component Requirements14
Physical Features14
INSTALLINGTHE ROUTER
Introduction19
Safety Information19
Positioning the Router19
Using the Rubber Feet20
Wall Mounting20
Powering Up the Router21
Connecting the Router21
SETTING UP YOUR COMPUTERS
Obtaining an IP Address Automatically23
Windows 200023
Windows Vista25
Windows XP26
Macintosh26
Disabling PPPoE and PPTP Client Software27
Disabling Web Proxy27
Basic Connection Checks105
Browsing to the Router Configuration Screens105
Connecting to the Internet106
Forgotten Password and Reset to Factory Defaults106
Wireless Networking107
Recovering from Corrupted Software109
Frequently Asked Questions110
IP ADDRESSING
The Internet Protocol Suite111
Managing the Router over the Network111
IP Addresses and Subnet Masks111
How does a Device Obtain an IP Address and Subnet Mask?113
This guide describes how to install and configure the 3Com Wireless 11n
Cable/DSL Firewall Router (3CRWER300-73).
This guide is intended for use by those responsible for installing and
setting up network equipment; consequently, it assumes a basic working
knowledge of LANs (Local Area Networks) and Internet Routers.
If a release note is shipped with the 3Com Wireless 11n Cable/DSL
Firewall Router and contains information that differs from the
information in this guide, follow the information in the release note.
Most user guides and release notes are available in Adobe Acrobat
Reader Portable Document Format (PDF) on the 3Com World Wide Web
site:
http://www.3Com.com
Naming ConventionThroughout this guide, the 3Com Wireless 11n Cable/DSL Firewall Router
is referred to as the “Router”.
Category 3 and Category 5 Twisted Pair Cables are referred to as Twisted
Pair Cables throughout this guide.
8ABOUT THIS GUIDE
ConventionsTa bl e 1 and Tab l e 2 list conventions that are used throughout this guide.
Tab le 1 Notice Icons
IconNotice TypeDescription
Information noteInformation that describes important features or
instructions.
CautionInformation that alerts you to potential loss of data or
potential damage to an application, system, or device.
WarningInformation that alerts you to potential personal
injury.
Tab le 2 Text Conventions
ConventionDescription
The words “enter”
and “type”
When you see the word “enter” in this guide, you must type
something, and then press Return or Enter. Do not press
Return or Enter when an instruction simply says “type.”
Keyboard key namesIf you must press two or more keys simultaneously, the key
names are linked with a plus sign (+). Example:
Press Ctrl+Alt+Del
Words in italicsItalics are used to:
■ Emphasize a point.
■ Denote a new term at the place where it is defined in the
text.
■ Identify menu names, menu commands, and software
button names. Examples:
From the Help menu, select Contents.
Click OK.
Feedback About This User Guide9
Feedback About
This User Guide
Related
Documentation
Your suggestions are very important to us. They will help make our
documentation more useful to you. Please e-mail comments about this
document to 3Com at:
pddtechpubs_comments@3com.com
Please include the following information when commenting:
■ Document title
■ Document part number (on the title page)
■ Page number (if appropriate)
Example:
■ 3Com Wireless 11n Cable/DSL Firewall Router User Guide
■ Part Number 10015880 Rev. AA
■ Page 24
Do not use this e-mail address for technical support questions. For
information about contacting Technical Support, please refer to
Appendix C
.
In addition to this guide, each Router document set includes one
Installation Guide. This guide contains the instructions you need to install
and configure your Router.
10ABOUT THIS GUIDE
1
INTRODUCINGTHE ROUTER
Welcome to the world of networking with 3Com®. In the modern
business environment, communication and sharing information is crucial.
Computer networks have proved to be one of the fastest modes of
communication but, until recently, only large businesses could afford the
networking advantage.
Wireless 11n
Cable/DSL Firewall
Router
The 3Com Wireless 11n Cable/DSL Firewall Router is designed to provide
a cost-effective means of sharing a single broadband Internet connection
amongst several wired and wireless computers. The Router also provides
protection in the form of an electronic “firewall” preventing anyone
outside of your network from seeing your files or damaging your
computers. The Router can also prevent your users from accessing Web
sites which you find unsuitable.
Figure 1 shows an example network without a Router. In this network,
only one computer is connected to the Internet. This computer must
always be powered on for the other computers on the network to access
the Internet.
12CHAPTER 1: INTRODUCINGTHE ROUTER
Figure 1 Example Network Without a Router
When you use the Router in your network (Figure 2), it becomes your
connection to the Internet. Connections can be made directly to the
Router, or to an OfficeConnect Switch or Hub, expanding the number of
computers you can have in your network.
Figure 2 Example Network Using a Firewall Router
Router AdvantagesThe advantages of the Router include:
■ Shared Internet connection for both wired and wireless computers
■ High speed 802.11n wireless networking
■ No need for a dedicated, “always on” computer serving as your
Internet connection
■ Cross-platform operation for compatibility with Windows, Unix and
Macintosh computers
■ Easy-to-use, Web-based setup and configuration
■ Provides centralization of all network address settings (DHCP)
■ Acts as a Virtual server to enable remote access to Web, FTP, and other
services on your network
■ Security — Firewall protection against Internet hacker attacks and
encryption to protect wireless network traffic
Package ContentsThe Router kit includes the following items:
Router Advantages13
■ One 3Com Wireless 11n Cable/DSL Firewall Router
■ One power adapter for use with the Router
■ Four rubber feet
■ One Ethernet cable
■ One CD-ROM containing this User guide
■ Installation guide
■ Support and Safety sheet
■ Warranty sheet
■ Product range sheet
If any of these items are missing or damaged, please contact your retailer.
14CHAPTER 1: INTRODUCINGTHE ROUTER
Minimum System
and Component
Requirements
Your Router requires that the computer(s) and components in your
network be configured with at least the following:
■ A computer with an operating system that supports TCP/IP
networking protocols (for example Windows 2000/XP,/Vista, Unix,
Mac OS 8.5 or higher).
■ An Ethernet 10 Mbps or 10/100 Mbps NIC for each computer to be
connected to the four-port switch on your Router.
■ An 802.11b or 802.11g or 802.11n wireless NIC.
■ An active ADSL or Cable subscription and connection.
■ A Web browser that supports JavaScript, such as Netscape 4.7 or
higher, Internet Explorer 6.0 or higher, or Mozilla 1.2.1 or higher.
Physical FeaturesThe front panel of the Router contains a series of indicator lights (LEDs)
that help describe the state of various networking and connection
operations.
Figure 3 Router - Front Panel
Physical Features15
1 Alert LED
Amber
Fast flash during self test. If self test fails the LED will remain on.
Fast flash during software upgrade.
Fast flash for software reset to the factory defaults.
Fast flash for hardware reset to the factory defaults.
The LED is on for 2 seconds when the firewall detects a hacker attack.
2Cable/DSL
Blue
LED on indicates the physical connection is on.
Fast flash means WAN port traffic activity.
3 Wireless LAN (WLAN) Status LED
Blue
If the LED is on it indicates that wireless networking is enabled. If the LED
is flashing, the link is OK and data is being transmitted or received. If the
LED is off, the Wireless LAN has been disabled in the Router, or there is a
problem. Refer to Chapter 6 Troubleshooting
.
4 LAN Status LEDs (4 indicators)
Blue
If the LED is on, the link between the port and the next piece of network
equipment is OK. If the LED is flashing, the link is OK and data is being
transmitted or received. If the LED is off, nothing is connected, or the
connected device is switched off, or there is a problem with the
connection (refer to Chapter 6 Troubleshooting
). The port will
automatically adjust to the correct speed and duplex.
5 WPS LED
LED on indicates the WPS function is active.
16CHAPTER 1: INTRODUCINGTHE ROUTER
The rear panel (Figure 4) of the Router contains one WPS button, four
LAN ports, one WAN port, one WiFi LED, a reset button, and a power
adapter socket.
Figure 4 Router - Rear Panel
1 Wireless Antennae
The antennaes should be placed in a ‘V’ position when initially installed.
CAUTION: Do not force the antennae beyond their mechanical stops.
Rotating the antennae further may cause damage.
2 WPS button
Press this button when making WPS setup.
3 Ethernet Ports (4 ports)
Using suitable RJ-45 cables, you can connect your Router to a computer,
or to any other piece of equipment that has an Ethernet connection (for
example, a hub or a switch). These ports have an automatic MDI/MDIX
feature, which means either straight-through or a crossover cable can be
used.
4WAN Port
RJ-45 port used to connect the Router with Cable/DSL modem.
5 WiFi On/Off button
Use this button to turn on/turn off the wireless function.
Physical Features17
6 Reset Button
If you want to reset your Router to factory default settings, or cannot
access the web management interface (for example, due to a lost
password), then you may use this button. Refer to Forgotten Password
and Reset to Factory Defaults on page 106 for further details.
7 Power Adapter Socket
Only use the power adapter that is supplied with this Router. Do not use
any other adapter.
18CHAPTER 1: INTRODUCINGTHE ROUTER
INSTALLINGTHE ROUTER
2
IntroductionThis chapter will guide you through a basic installation of the Router,
including:
■ Connecting the Router to the Internet.
■ Connecting the Router to your network.
■ Setting up your computers for networking with the Router.
Safety InformationPlease note the following:
Positioning the
Router
WARNING: Please read the Safety Information
before you start.
VORSICHT: Bitte lesen Sie den Abschnitt Wichtige Sicherheitshinweise
sorgfältig durch, bevor Sie das Gerät einschalten.
AVERTISSEMENT: Veuillez lire attentivement la section Consignes
importantes de sécurité avant de mettre en route.
You should place the Router in a location that:
■ is conveniently located for connection to the telephone socket.
■ is centrally located to the wireless computers that will connect to the
Router. A suitable location might be on top of a high shelf or similar
furniture to optimize wireless connections to computers in both
horizontal and vertical directions, allowing wider coverage.
■ allows convenient connection to the computers that will be connected
to the four LAN ports on the rear panel, if desired.
■ allows easy viewing of the front panel LED indicator lights, and access
to the rear panel connectors, if necessary.
section in Appendix C
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