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Page 76 / 92 Scroll up to view Page 71 - 75
X5668 / X5668U
User’s Guide
71
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:
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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72
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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73
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.

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