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Problem

Troubleshooting Suggestion

I forgot/lost my user ID or

password.

If you have not changed the password from the

default, try using “admin” as both the user ID

and password. Otherwise, you can reset the

device to the default configuration by pressing

three times the Reset Default button on the

front panel of the device. Then, type the default

User ID and password shown above.

WARNING:

Resetting the device removes any

custom settings and returns all settings to their

default values.

I cannot access the web pages

from my browser.

Use the ping utility, discussed in the following

section, to check whether the PC can

communicate with the device’s LAN IP address

(by default 192.168.1.1). If it cannot, check the

Ethernet cabling.

Verify that you are using Internet Explorer or

Netscape Navigator v4.0 or later.

Verify that the PC’s IP address is defined as

being on the same subnet as the IP address

assigned to the LAN port on the device

.

My changes to the web pages

are not being retained.

Be sure to use the

Confirm Changes

function

after any changes.

Diagnosing Problem using IP Utilities

Ping

Ping is a command you can use to check whether your PC can recognize other

computers on your network and the Internet. A ping command sends a message to

the computer you specify. If the computer receives the message, it sends messages

in reply. To use it, you must know the IP address of the computer with which you are

trying to communicate.

On Windows-based computers, you can execute a ping command from the Start

menu. Click the Start button, and then click Run. In the Open text box, type a

statement such as the following:

ping 192.168.1.1

Click OK. You can substitute any private IP address on your LAN or a public IP

address for an Internet site, if known.

If the target computer receives the message, a Command Prompt window is

displayed:

If the target computer cannot be located, you will receive the message Request timed

out.

Using the ping command, you can test whether the path to the device is working

(using the preconfigured default LAN IP address 192.168.1.1) or another address you

assigned.

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You can also test whether access to the Internet is working by typing an external

address, such as that for www.yahoo.com (216.115.108.243). If you do not know the

IP address of a particular Internet location, you can use the nslookup command, as

explained in the following section.

From most other IP-enabled operating systems, you can execute the same command

at a command prompt or through a system administration utility.

Nslookup

You can use the nslookup command to determine the IP address associated with an

Internet site name. You specify the common name, and the nslookup command looks

up the name in on your DNS server (usually located with your ISP). If that name is not

an entry in your ISP’s DNS table, the request is then referred to another higher-level

server, and so on, until the entry is found. The server then returns the associated IP

address.

On Windows-based computers, you can execute the nslookup command from the

Start menu. Click the Start button, and then click Run. In the Open text box, type the

following:

Nslookup

Click OK. A Command Prompt window displays with a bracket prompt (>). At the

prompt, type the name of the Internet address that you are interested in, such as

www.microsoft.com

.

The window will display the associate IP address, if known, as shown below:

There may be several addresses associated with an Internet name. This is common

for web sites that receive heavy traffic; they use multiple, redundant servers to carry

the same information.

To exit from the nslookup utility, type

exit

and press

[Enter]

at the command prompt.

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Appendix C – Glossary

Term

Description

802.11

A family of specifications for wireless

LANs developed by a working group of the IEEE. This

wireless Ethernet protocol, often called Wi-Fi.

10BASE-T

A designation for the type of wiring used by Ethernet

networks with a data rate of 10 Mbps. Also known as

Category 3 (CAT 3) wiring. See data rate, Ethernet.

100BASE-T

A designation for the type of wiring used by Ethernet

networks with a data rate of 100 Mbps. Also known as

Category 5 (CAT 5) wiring. See data rate, Ethernet.

ADSL

Asymmetric Digital Subscriber Line

The most commonly deployed “flavor” of DSL for home

users is asymmetrical DSL. The term asymmetrical

refers to its unequal data rates for downloading and

uploading (the download rate is higher than the upload

rate). The asymmetrical rates benefit home users

because they typically download much more data from

the Internet than they upload.

Analog

An analog signal is a signal that has had its frequency

modified in some way, such as by amplifying its strength

or varying its frequency, in order to add information to

the signal. The voice component in DSL is an analog

signal. See digital.

ATM

Asynchronous Transfer Mode

A standard for high-speed transmission of data, text,

voice, and video, widely used within the Internet. ATM

data rates range from 45 Mbps to 2.5 Gbps. See data

rate.

Authenticate

To verify a user’s identity, such as by prompting for a

password.

Binary

The “base two” system of numbers that uses only two

digits, 0 and 1, to represent all numbers. In binary, the

number 1 is written as 1, 2 as 10, 3 as 11, 4 as 100, etc.

Although expressed as decimal numbers for

convenience, IP addresses in actual use are binary

numbers; e.g., the IP address 209.191.4.240 is

11010001.10111111.00000100.11110000 in binary.

See bit, IP address, network mask.

Bit

Short for “binary digit,” a bit is a number that can have

two values, 0 or 1. See binary.

Bps

bits per second

Bridging

Passing data from your network to your ISP and vice

versa using the hardware addresses of the devices at

each location. Bridging contrasts with routing which can

add more intelligence to data transfers by using network

addresses instead. The device can perform both routing

and bridging. Typically, when both functions are

enabled, the device routes IP data and bridges all other

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types of data. See routing.

Broadband

A telecommunications technology that can send

different types of data over the same medium. DSL is a

broadband technology.

Broadcast

To send data to all computers on a network.

DHCP

Dynamic Host Configuration Protocol

DHCP automates address assignment and

management. When a computer connects to the LAN,

DHCP assigns it an IP address from a shared pool of IP

addresses; after a specified time limit, DHCP returns the

address to the pool.

DHCP relay

Dynamic Host Configuration Protocol relay

A DHCP relay is a computer that forwards DHCP data

between computers that request IP addresses and the

DHCP server that assigns the addresses. Each of the

device’s interfaces can be configured as a DHCP relay.

See DHCP.

DHCP server

Dynamic Host Configuration Protocol server

A DHCP server is a computer that is responsible for

assigning IP addresses to the computers on a LAN. See

DHCP.

Digital

Of data, having a form based on discrete values

expressed as binary numbers (0’s and 1’s). The data

component in DSL is a digital signal. See analog.

DNS

Domain Name System

The DNS maps domain names into IP addresses. DNS

information is distributed hierarchically throughout the

Internet among computers called DNS servers. For

example, www.yahoo.com is the domain name

associated with IP address 216.115.108.243. When you

start to access a web site, a DNS server looks up the

requested domain name to find its corresponding IP

address. If the DNS server cannot find the IP address, it

communicates with higher-level DNS servers to

determine the IP address. See domain name.

Domain name

A domain name is a user-friendly name used in place of

its associated IP address. Domain names must be

unique; their assignment is controlled by the Internet

Corporation for Assigned Names and Numbers

(ICANN). Domain names are a key element of URLs,

which identify a specific file at a web site. See DNS.

Download

To transfer data in the downstream direction, i.e., from

the Internet to the user.

DSL

Digital Subscriber Line

A technology that allows both digital data and analog

voice signals to travel over existing copper telephone

lines.

Encryption keys

See network keys

Ethernet

The most commonly installed computer network

technology, usually using twisted pair wiring. Ethernet

data rates are 10 Mbps and 100 Mbps. See also

10BASE-T, 100BASE-T, twisted pair.

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FTP

File Transfer Protocol

A program used to transfer files between computers

connected to the Internet. Common uses include

uploading new or updated files to a web server, and

downloading files from a web server.

Gbps

Abbreviation of Gigabits per second, or one billion bits

per second. Internet data rates are often expressed in

Gbps.

Host

A device (usually a computer) connected to a network.

HTTP

Hyper-Text Transfer Protocol

HTTP is the main protocol used to transfer data from

web sites so that it can be displayed by web browsers.

See web browser, web site.

Hub

A hub is a place of convergence where data arrives from

one or more directions and is forwarded out in one or

more directions. It connects an Ethernet bridge/router to

a group of PCs on a LAN and allows communication to

pass between the networked devices.

ICMP

Internet Control Message Protocol

An Internet protocol used to report errors and other

network-related information. The ping command makes

use of ICMP.

IEEE

The Institute of Electrical and Electronics Engineers is a

technical professional society that fosters the

development of standards that often become national

and international standards.

Internet

The global collection of interconnected networks used

for both private and business communications.

Intranet

A private, company-internal network that looks like part

of the Internet (users access information using web

browsers), but is accessible only by employees.

IP

See TCP/IP.

IP address

Internet Protocol address

The address of a host (computer) on the Internet,

consisting of four numbers, each from 0 to 255,

separated by periods, e.g., 209.191.4.240. An IP

address consists of a network ID that identifies the

particular network the host belongs to, and a host ID

uniquely identifying the host itself on that network. A

network mask is used to define the network ID and the

host ID. Because IP addresses are difficult to

remember, they usually have an associated domain

name that can be specified instead. See domain name,

network mask.

ISP

Internet Service Provider

A company that provides Internet access to its

customers, usually for a fee.

LAN

Local Area Network.

A network limited to a small geographic area, such as a

home or small office.