X8821e/X8821m / X8824e/X8824m User’s Guide
63
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.
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:
