.
User ’s Manual
XRouter
(MIH-120)
acsen se
R
Copyright
Copyright © 1999 by this company. All rights reserved. No part of
this documentation may be reproduced in any form or by any means
or used to make any directive work (such as translation or transformation) without permission from Macsense Connectivity, Inc. Macsense
Connectivity, Inc. reserves the right to revise this documentation and to
make changes in content without obligation among Macsense
Connectivity, Inc. to provide notification of such revision or change.
FCC Notice
This equipment has been tested and found to comply with the
limits for a Class B digital device, pursuant to Part 15 of FCC Rules.
These limits are designed to provide protection against harmful interference in residential installations. This equipment generates radio
frequencies that may cause interference with radio communications if
not used in accordance with the instructions. Interference may even
occur with proper installation. If this equipment causes interference,
the user is encouraged to correct the interference with one or more of
the following measures:
1. Reorient or relocate the receiving antenna.
2. Increase the separation between the equipment and receiver.
3. Connect the equipment into an outlet on a circuit that is separate from the one to which the receiver is connected.
4. Consult the dealer or an experienced radio/television technician
for help.
i
Safety Precautions
1. Follow all warnings and instructions marked on the product.
2. Slots and openings on the device are provided for ventilation.
To protect it from overheating, these openings must not be
blocked or covered.
3. Do not use or store this product in an environment that exceeds
temperature and humidity specifications. Do not place this
product near a radiator or heat register, or in a built-in installation unless adequate ventilation is provided.
4. Before cleaning this product, unplug from wall outlet. Do not use
liquid cleaners or aerosol cleaners. Use a damp cloth for
cleaning.
5. Do not place cords or cables where they may be walked on or
tripped over.
6. Be sure to comply with any applicable local safety standards or
regulations.
7. General purpose cables are provided with this product. Any
cables or other requirements mandated by local authority are
your responsibility.
8. Cables that are attached to devices in different locations that
have different power sources and grounding may have
hazardous voltage potentials. Consult a qualified electrical
consultant before installing the product to see if this
phenomenon exists and, if necessary, take corrective action.
9. Never touch annunciated telephone wires or terminals unless
the line has been disconnected.
10. Avoid using telephone equipment or installing the product
during an electrical storm.
11. Never install telephone jacks, lines, network cables, this
product, or power connections in wet locations.
12. Never spill liquid of any kind on the product.
ii
Table of Contents
ABOUT THIS MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . .1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
BEFORE YOU START . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Package Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Items Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . .4
EASY INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Hardware Installation . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Software Configuration . . . . . . . . . . . . . . . . . . . . . . . . . .8
Windows 95 TCP/IP Configuration . . . . . . . . . . . . . . . . .8
Mac OS TCP/IP Configuration . . . . . . . . . . . . . . . . . . .12
Setting up the XRouter Through a Web Browser . . . . . .14
ADVANCED CONFIGURATION . . . . . . . . . . . . . . . . . . . . .17
DHCP Server Settings . . . . . . . . . . . . . . . . . . . . . . . . . .17
Virtual Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Device Administration . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Status Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
DMZ Host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Firmware Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
APPENDIX A SPECIFICATIONS . . . . . . . . . . . . . . . . . . . .22
APPENDIX B Hardware Description . . . . . . . . . . . . . . . .23
APPENDIX C GLOSSARY . . . . . . . . . . . . . . . . . . . . . . . . .25
iii
ABOUT THIS MANUAL
This user manual describes how to connect a LAN to the Internet
using the XRouter Internet Sharing Hub, MIH-120. This manual
assumes you are familiar with the basics of personal computing and
network environments. The material is organized as follows:
Chapter Content
Introduction Describes the features and main
applications of the XRouter
Before You Start Describes the environment needed to
set up the XRouter
Easy Installation Describes how to install the XRouter
for ordinary applications
Advanced Configuration Describes the configuration options for
the XRouter
Troubleshooting Lists problems and solutions one might
encounter when using the XRouter
Appendix A Hardware Description
Appendix B Specifications
Appendix C Glossary
About This Manual
1
INTRODUCTION
Thank you for purchasing the XRouter MIH-120 Internet Sharing
Hub. The XRouter functions as an easy-to-use communication device
that allows you to connect a local area network (LAN) to the Internet
affordably. With the XRouter you can get as many as 252 Macintosh or
PC users online simultaneously through just one cable line or DSL,
and one ISP account. The XRouter installs quickly and easily, and best
of all, it’s a breeze to use.
Sharing Internet Access
The XRouter provides high-speed Internet access to multiple users
by splitting the bandwidth from a cable line or from DSL (Digital
Subscriber Line) into tiny portions and then routing these bandwidth
“slices” to almost any number of Internet users. The fewer the number
of users online at any one time, the faster the service each individual
receives. Internet users on different nodes are not limited to looking at
the same Web pages. Each node is functionally independent from the
other nodes connected to the XRouter.
Modems Supported
The XRouter supports cable modems and DSL modems. The
XRouter has one WAN (Wide Area Network) port for connecting the
unit to either a cable modem or a DSL modem. Either technology
should provide more than enough bandwidth to accommodate the
needs of even large groups of Internet users.
Built-in DHCP Server
The XRouter’s built-in DHCP Server dramatically reduces the
configuration and maintenance effort by allowing you to automatically
configure the TCP/IP setting of computers over a local area network.
Introduction
2
4-Port Ethernet Hub Inside
In addition to providing Internet sharing capability, the XRouter
also functions as an Ethernet hub, offering four 10BASE-T, RJ-45 ports
that allow you to connect a series of computers to form a small LAN.
Easy Configuration
The XRouter can be configured through a Web browser, and fea-
tures Web-based management for a simple, intuitive set up.
Virtual Server
Internet users can set up an in-house Web server, such as WWW
or FTP, through the XRouter’s Virtual Server mapping function. The
Virtual Server allows you to select a particular computer in your
network to respond to outside Internet requests.
Security
The XRouter provides firewall-like security through NAT (Network
Address Translation) to prevent unauthorized Internet users from
accessing internal files. It can also filter out Internet requests from
certain nodes on a local network for administrative purposes.
NAT (Network Address Translation)
The XRouter features NAT (Network Address Translation) as a
means of translating private IP addresses into a global IP address that
is, in turn, registered to the Internet. NAT essentially masks local IP
addresses to the outside world, allowing a group of Internet users to
share a single ISP account (which means you don’t have to buy separate accounts for each user).
Introduction
3
BEFORE YOU START
Package Overview
Please check to make sure your XRouter package includes the
items listed below before setting up your XRouter.
__ an XRouter
__ a power adapter
__ this user manual
__ a Category-5 UTP cable with RJ-45 connectors
Items Required
__ an account from an ISP (Internet Service Provider)
__ a cable line or DSL
__ a cable modem or DSL modem
__ additional UTP cables with RJ-45 connectors (for additional
computers)
System Requirements
• Computer equipped with 10BASE-T Ethernet connection inter-
face that supports TCP/IP protocol
• Windows 95/98, Windows NT 4.0 or later versions
• Mac OS 7.5.3 or later versions
• Netscape Communicator 4.0 or above (Microsoft Internet
Explorer 4.0 or later versions are necessary for Web configuration.)
(NOTE: For future firmware upgrades, one of the operating
systems listed above is needed.)
Before You Start
4
EASY INSTALLATION
Hardware Installation
Before connecting the XRouter to your LAN please verify that your
cable or DSL service is active and operating correctly. If you are experiencing difficulties with your cable or DSL service, please contact your
service provider before proceeding with this installation.
Connecting the XRouter to Your Modem
After verifying that your cable or DSL service is functioning properly,
connect your cable modem or DSL modem to the XRouter by following
the instructions below:
1. If you have not already done so, disconnect the Ethernet cable
from the computer that is currently connected to the DSL or
cable modem.
2. Plug the RJ-45 connector from this cable into the WAN (Wide
Area Network) port on the back panel of the XRouter. (See
Figure 1.1)
3. Leave the other end of this Ethernet cable connected to the
DSL modem or cable modem.
5
Figure 1.1 - Connecting the Xrouter
PC
Mac
Ethernet
Cable
Ethernet
Cable
Ethernet
Cable
Cable or DSL modem
LAN
WAN
Reset
Connecting Computers to the XRouter
When you have finished connecting the XRouter to your DSL or cable
modem, you can begin connecting the Macintosh or PC computers in
your local area network to the XRouter. There are two common methods for connecting the computers in your LAN to the XRouter: (1) plugging computers directly into the XRouter, and (2) connecting the
XRouter to your LAN hub.
To connect computers directly to the XRouter:
(NOTE: You will need an Ethernet cable for each additional
computer you plan on connecting to the XRouter.)
1. Plug one RJ-45 connector (of a standard twisted-pair Ethernet
cable) to the Ethernet port on your computer.
2. Plug the other end of this cable to any one of the
XRouter’s four LAN ports (located on the left side of the
XRouter’s rear panel. Refer to Figure 1.1)
3. Repeat steps 1 and 2 for each computer you wish to provide
with Internet access until all four XRouter LAN ports are filled.
(NOTE: To connect more than four computers to the XRouter,
simply plug additional computers into a network hub and
then plug this hub into the XRouter’s uplink port. Read below.)
To connect an existing LAN to the XRouter:
As an alternative to connecting computers directly into the XRouter’s
LAN ports, you can also connect a pre-existing network of computers
to the XRouter by uplinking your network’s central LAN hub to the
XRouter’s uplink port. (See Figure 1.2)
To connect a LAN hub to the XRouter’s uplink port:
1. Set the DIP switch (located on the XRouter’s rear panel just
left of the No. 4 LAN port) from “straight” to “crossover” mode.
6
Easy Installation
Switch to left for
crossover mode
Switch to right for
normal mode
2. Plug one RJ-45 connector (of a standard twisted-pair Ethernet
cable) to the XRouter’s No. 4 LAN port.
3. Plug the other end of this Ethernet cable into an available port
on the network hub.
(NOTE: Multiple network hubs can be connected to the
XRouter’s LAN ports No.1-3 if these hubs are equipped with
uplink ports. By daisy-chaining a series of hubs, you can
connect up to 252 users to the XRouter.)
Connecting the Power Supply
To provide your XRouter with power:
1. Plug the power adapter of the XRouter into an AC power
outlet.
2. Plug the other end of the power adapter cable into the power
receptacle on the rear panel of the unit.
3. The Power LED on the XRouter’s front panel should be lit
immediately.
7
LAN
Cable Or DSL Modem
Ethernet Cables
PC
Mac
Hub
Figure 1.2 - Connect an Existing LAN
WAN
Reset
Software Configuration
Setting Up the TCP/IP
Congratulations on installing the XRouter’s hardware! In the next
pages we will show you how to enable communication between the
XRouter and its managing and client computers.
Part of the process of enabling communication involves setting the
IP addresses for the computer that will be directly managing the
XRouter’s operations and the client computers that will be receiving
Internet access from the XRouter. These computers must have their IP
addresses configured such that they share the same subnet numbering scheme as the XRouter’s default IP address. We will explain this in
more detail later in the chapter.
Configuring the IP addresses of the managing and client computers is a simple process that can be performed through your computer’s
control panel. We have provided instructions for the configuration
process for both Macintosh and PC users. Find the appropriate set of
instructions in the pages that follow.
Windows 95 TCP/IP Configuration of Computers
1. Double-click the Control Panel icon in My Computer folder.
2. From the Control Panel, double-click the Network icon. The
network interface card (installed on your computer) appears
along with the network protocol on the Configuration
list.
3. Double-click TCP/IP protocol on the list. If TCP/IP does not
appear on the list, you must install the TCP/IP protocol first as
illustrated in step 4. Clients with TCP/IP already installed may
skip to step 5.
8
Easy Installation
4. To install the TCP/IP protocol:
a. Keep your copy of Windows 95/98 CD-ROM on hand.
(You will need it for this installation.)
b. Click the Add... button from the Configuration
list of the
Network window. A new window appears.
c. Double-click Protocol. Then, in the Select Network Protocol
window, choose Microsoft on the Manufacturers list, and
select TCP/IP on the right side of the list.
d. Follow the instructions that appear on the monitor to
complete the installation.
9
5. After double-clicking the installed TCP/IP protocol, the TCP/IP
properties window appears. To let the computer’s TCP/IP
values be automatically assigned by the XRouter’s DHCP
server:
a. Click the IP
Address tab from the TCP/IP properties window.
b. Select the item Obtain IP address automatically. The
XRouter automatically assigns values for the computer’s
Gateway
, DNS Configuration, and IP Address.
6. After specifying the settings of TCP/IP click OK and then restart
Windows to allow the settings to take effect.
10
Easy Installation
Assigning TCP/IP Values Manually
If you already have a DHCP server on the network, or if you prefer
not using the XRouter’s DHCP server to assign TCP/IP values automatically, you can input these values manually.
To enter values for the managing computer’s address manually:
1. Click the IP Address tab from the TCP/IP properties window.
2. In the IP
Address field enter “192.168.1.x” where x is any
variable of your choice ranging from 2 - 252. Enter
255.255.255.0 in the Subnet Mask field.
(NOTE: No two computers on the same LAN can have the
same IP address or an IP address conflict will occur.)
3. Click the DNS tab and enter the DNS IP addresses provided
by your ISP in the DNS
fields.
4. Click the Gateway tab and enter a value in the Gateway IP
address field. The Gateway IP address value must be the
same as the XRouter's IP address; (the XRouter’s default IP
address is 192.168.1.1).
5. After specifying the settings of TCP/IP click OK and restart
Windows to allow the settings to take effect.
11
Mac OS TCP/IP Configuration
1. Open the TCP/IP control panel.
2. In the Connect via menu select the Ethernet interface that is
installed on your computer.
3. In the Configure pull-down menu that appears, select Using
DHCP Server to allow the built-in DHCP server of the XRouter
to assign an IP address and other TCP/IP configuration information to the client automatically. Do this for each client that
needs Internet access through the XRouter.
4. Close the TCP/IP window and save the changes.
12
Easy Installation
Assigning TCP/IP Values Manually
If you already have a DHCP server on the network, or if you prefer
not using the XRouter’s DHCP server to assign TCP/IP values automatically, you can input these values manually.
To enter values for the managing computer’s address manually:
1. In the Connect via menu select the Ethernet interface that is
installed on your computer.
2. In the Configure menu select Manually.
a. In the IP
Address field, enter “192.168.1.x” where x is any
variable of your choice ranging from 2 - 252.
(NOTE: No two computers on the same LAN can have the
same IP address or an IP address conflict will occur.)
b. In the Subnet Mask
field enter 255.255.255.0.
c. In the Router
Address field enter 192.168.1.1, the XRouter’s
default address.
d. In the Name Server
Address field enter the DNS information
provided by your ISP. In the Search Domains field enter the
domain information provided by your ISP.
e. Close the TCP/IP window and save the changes.
13
Setting Up the XRouter Through a Web Browser
Now that you have finished configuring the TCP/IP addresses of
the client and managing computers, you can begin configuring the
XRouter’s Internet settings. This can be done through a standard Web
browser (such as Netscape Navigator, Netscape Communicator, or
Microsoft Internet Explorer).
(IMPORTANT: Before following the instructions below you must
find out if your ISP is providing dynamic or static IP addressing. If your
service is dynamic, you do not need to follow the instructions below
because the XRouter automatically configures the TCP/IP information
provided by your ISP and you should already have Internet access. If
this is the case, you are done installing the XRouter and can begin
accessing the Internet from any of the client computers. However, if
your ISP has provided a static IP address or if you would like to make
further changes to the advanced features, you will need to enter the
Web-based configuration.)
Enter the Web-based configuration:
1. Launch your computer’s Web browser.
(NOTE: Netscape Communicator 4.0, Internet Explorer 4.0 or
above are necessary for configuring the XRouter. Other clients
are not subject to this restriction.)
2. Type the XRouter's default IP address (192.168.1.1) in the
URL
field. This is the area where you would normally enter a
Web site address such as “www.macsensetech.com”.
3. Press Enter. The Username and Password window appears.
4. Leave the User name
field blank and type “admin“ as the
default password for the XRouter. You can change the password through a Web management page later. Click OK to
enter the Web management page.
14
Easy Installation
5. The OnePage Setup window appears. Note that this page is
divided into two basic sections -- Private IP Address, and
Public IP Address.
Host Name - This is an optional section. Some ISPs require a host
name in order to be recognized by their systems. Your ISP should
provide this if needed for their systems.
Private IP Address - This section can be used to change the
XRouter’s internal IP Address that is visible to the client computers on
the LAN. However, we recommend that you do not alter the default IP
address (192.168.1.1) unless you need to make modifications to fit your
network environment.
Public IP Address - This section can be used to manually enter IP
address information provided by your ISP. You will not need to make any
changes to the default values in this section if your ISP automatically
assigns IP addresses. However, if your ISP has provided you with a
static IP address, you will need to enter this information by following the
instructions below.
To make changes to the Public IPAddress fields:
1. Select Specify an IP Address.
15
2. Enter the static IP address provided by your ISP in the field
located immediately to the right of “Specify an IP Address.”
3. Leave the Public Subnet Mask
as the default setting.
4. In the Default Gateway IP
Address field, enter the information
provided by your ISP. Note that your ISP may refer to this
information as a “Gateway/Router IP Address.” Also note that
this number is not the same as the IP Address value that you
entered in step 2.
5. Enter the DNS information provided by your ISP in the Domain
Name Server fields. Your ISP should provide at least two
unique DNS numbers.
16
Easy Installation
ADVANCED CONFIGURATION
Please refer to the previous chapter on how to enter the Web
Management page of the XRouter. The Advanced Menu contains four
sub-menus including DHCP Settings, Virtual Server, Device Admin,
and Status Monitor.
DHCP Server Settings
To alter the starting IPAddress range, the number of users that
are automatically assigned IP adressses on the LAN, or to disable the
DHCP server, you must enter the DHCP Settings page to make
changes.
17
Advanced Configuration
Virtual Server
It is possible to set up your own Web or FTP server on your network for external Internet users to access. Internet users simply need
to enter the IP address that has been assigned to you. The XRouter
will redirect the request of the Internet user to the specified internal
hidden IP address of the TCP port request.
(NOTE: It will be much more convenient to have a fixed address
from your ISP. Failure to do so will result in being assigned a different
IP address every time your connection to the ISP is reset.)
For example, if you set up the TCP port 80 (HTTP: Hypertext
Transfer Protocol) to be redirected to the IP address"192.168.1.2" on
the Virtual Server setting, the request from the external Internet user
via HTTP protocol (i.e. acquire Web page from browser) will be transferred through the XRouter to the computer with the IP address
"192.168.1.2" on your local network.
18
Advanced Configuration
Device Administration
This page displays information about the firmware version and
MAC address of this XRouter. You can change the password or reset
the device. Selecting Yes to the Factory defaults erases previously
configured settings, returning the unit to its original default settings.
Status Monitor
This page provides information on the working status of the
XRouter.
DMZ (DeMilitarized ) Host
This feature will open all in/out accesses for one LAN computer.
This is useful for machines that host TCP/IP services that should be
fully exposed to the public network. For example, Internet Gaming,
NetMeeting, Timbuktu, or other types of services may require this typeof access. Please enter one LAN IP Address below. Activate this feature only when required. (Entering “0” designates inactive)
19
Advanced Configuration
Firmware Upgrade
Macsense is continually improving the firmware (software programmed on a PROM) in each of its products. The XRouter is shipped
with the most up to date software available at production time. If a
firmware upgrade becomes available, it will be posted in the “Service
and Support” section of our Web site. To upgrade the XRouter, you will
need the TFTP client and the firmware file named “Code.bin.” These
two files can be found on our Web site at www.macsensetech.com.
Follow the upgrade procedure listed below.
1. Download these two files from the firmware updater on our
Web site: TFTP client, and “Code.bin”
2. Double-click the TFTP client icon to run the program. Enter
both the IP address of the XRouter and your password.
3. Click the button beside the File Name
field. A window appears.
Select a location of the firmware file “Code.bin”.
4. Click the Upgrade button to begin the upgrade process. After
the upgrade is complete, remember to reset the XRouter by
unplugging the device and then plugging it back in.
(NOTE: Keep the firmware file name ”Code.bin” unchanged
or the TFTP client software won’t recognize it.)
5. If the upgrade has failed, the Ready/Test LED will be blinking
on the XRouter. If this happens, try repeating steps 2 - 4 of
this procedure.
20
Advanced Configuration
TROUBLESHOOTING
This chapter provides solutions to problems that may occur during
installation and operation of the XRouter MIH-120.
1.
The Link LED is off
.
• Check that all connectors are firmly plugged-in.
• Check the power adapter making sure it is plugged into an
electrical outlet.
2.
The collision LED is always lit
.
• Make sure the 10BASE-T cable has not exceeded the
maximum 100-meter length limit.
• Check all connectors to make sure they are firmly
plugged into the appropriate ports.
• Use category 5 cables as this grade of cable will give you
the highest quality connection to the XRouter.
• Check the RJ-45 connectors at both ends of the cable to
make sure there is no faulty wiring.
5.
Can't connect to MIH-120 XRouter via Web browser
.
• Verify that the IP address 192.168.1.1 has been correctly
entered in the URL field.
• Check the network cable connection and LAN LED indicator
on the XRouter.
• Check out the TCP/IP setup on your client. Type "winipcfg"
on DOS prompt under Windows 95 or open the TCP/IP control panel on the Mac OS platform. The client should get an
IP address of 192.168.1.x (where "x" is from 1 to 252.)
Troubleshooting
25
APPENDIX A - Specifications
Standards Compliance
IEEE 802.3 10BASE-T
TCP/IP, DHCP, DNS
WAN Interface
One 10BASE-T RJ-45 port
LAN Interface
Four 10BASE-T RJ-45 ports
Web management
Yes
LED Display
Power, Link/Activity for WAN/LAN ports, Collision/Partition for LAN
ports
Environment
Operation Temperature 0~45°C (32~113°F)
Storage Temperature -20~70°C (-4~158°F)
Humidity 0~90%
Dimensions
LxWxH (mm) 142x236x46
LxWxH (in.) 5.59x9.29x1.81
Power
AC9V, 1A
Certifications
EMI/EMC -
FCC Class B / CE Mark Class A/ VCCI Class 1
Safety - CUL(UL&CSA)/LVD/TÜV
Appendix A
22
APPENDIX B - Hardware Description
Power green Indicates that there is power to the unit.
Ready/Test orange Flashes during boot up
WAN Port
Link green Indicates proper a connection with the
Internet Ethernet connection.
Activity orange Flashing LED indicates that data packets are
flowing through the WAN port.
LAN Ports
Link/ACT green Solid LED indicates a proper connection with
a computer and flashing LED indicates that
there are packets flowing through this
Ethernet port
Partition red Indicates that there is severe collision at this
port and being isolated from the other ports
temporarily.
Collision yellow Indicates that a collision is happening
23
Appendix B
Rear Panel Description
LAN Ethernet Ports - Four 10BASE-T Ethernet network (RJ-45)
ports used for linking hub/computer in a Local Area Network to the
XRouter.
WAN Ethernet Port - One Wide Area Network port for connecting
the XRouter to the Internet via a cable or DSL modem.
Reset Button - Used for resetting the XRouter’s IP Address
information and user password to the factory default settings.
AC9V Power Adapter Receptacle - Plug the power adapter cable
into this port to supply power to the XRouter unit.
Uplink Switch - Used to determine the configuration of the
XRouter’s LAN port No. 4. Choose either parallel (normal) for connecting LAN computers to the XRouter or crossover mode (uplink) for
daisy-chaining a series of hubs to the XRouter.
Hardware description
24
LAN
WAN
Reset
APPENDIX C - Glossary
DHCP
DHCP is a protocol for automatic IP configuration. Client side
computer can get one IP from DHCP server automatically. Using
DHCP can save the effort of setting IP for every LAN computers.
Domain Name
A name that identifies one or more IP addresses. For example, the domain name "microsoft.com" represents many IP addresses.
Domain names are used in URLs to identify particular Web pages. For
example, in the URL http://www.pcwebopedia.com/index.html, the
domain name is pcwebopedia.com.
IEEE
Abbreviation of Institute of Electrical and Electronics
Engineers, pronounced "I-triple-E". Founded in 1884, the IEEE is an
organization composed of engineers, scientists, and students. The
IEEE is best known for developing standards for the computer and
electronics industry. In particular, the IEEE 802 standards for local
area networks are widely adopted.
Internet
A global network connecting millions computers. As of 1998,
the Internet has more than 100 million users worldwide, and that
number is growing rapidly. More than 100 countries are linked into
exchanges of data, news and opinions.
IP Address
An identifier for a computer or device on a TCP/IP network.
Networks using the TCP/IP protocol route messages based on the IP
address of the destination. The format of an IP address is a 32-bit
numeric address written as four numbers separated by periods. Each
number's range is from 0 to 255. For example, 1.160.10.240 could be
a legal IP address.
Appendix C
25
ISP
Short for Internet Service Provider, a company that provides
access to the Internet. For a monthly fee, the service provider gives
you a software package, username, password and access phone
number. Equipped with a modem, you can then log on to the Internet
and browse the World Wide Web and USENET, and send and receive
e-mail.
Local Area Network (LAN)
A computer network that spans a relatively small area. Most
LANs are confined to a single building or group of buildings. However,
one LAN can be connected to other LANs over any distance via
telephone lines and radio waves. Asystem of LANs connected in this
way is called a wide-area network (WAN)
MAC Address
Short for Media Access Control address, a hardware address
that uniquely identifies each node of a network. In IEEE 802 networks,
the Data Link Control (DLC) layer of the OSI Reference Model is
divided into two sublayers: the Logical Link Control (LLC) layer and the
Media Access Control (MAC) layer. The MAC layer communicate
directly with the network media. Consequently, each different type of
network media requires a different MAC layer.
TCP/IP
Acronym for Transmission Control Protocol/Internet Protocol,
the suite of communications protocols used to connect hosts on the
Internet.
Appendix C
26
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