4-Port ADSL Router User Manual

Troubleshooting

179

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 ADSL Barricade 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.

o 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 nslooku

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-nslookup] window displays

with a bracket prompt (>). At the prompt, type the name of

the internet address your are interested in, such as