Asus Internet Security Router User Manual download pdf (Page 157)

Internet Security Router User’s Manual Appendix 15. Troubleshooting

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Figure 15.1. Using the ping Utility

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 Internet Security Router 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.

15.1.2 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 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 . A Command Prompt window displays with a bracket prompt (>). At the prompt, type the

name of the Internet address you are interested in, such as www.absnews.com.

The window will display the associate IP address, if known, as shown in Figure 15.2.

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Asus Internet Security Router User Manual Page 157