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Test Internet Connection


The main reason people build a wireless network in home or in small offices (SOHO) is to share the internet connection with many users wirelessly. The successful indicator of the installation and the configuration of the networking devices is if you can successfully test internet the connection to the WAN cloud.

Network Diagram

To test internet connection of your networking system, you should understand the connection diagram of your network.

A general networking diagram of a home wireless network can be shown in the following figure. The main components of the wireless network in home to share the internet connection includes the modem (DSL or Cable), the wireless router, and off course the wireless adapters in the computers. Use the UTP network cable (cable that comes with the modem) and connect one end to the Ethernet port of the modem, and the other end of the cable to the WAN port of the Wireless router.

More detail about the simple home computer network, check the link to understand how to build wireless network in home.

Assume that you have completed the installation and configuration of the wireless network as shown in the above diagram and expecting that everything will go fine, but unfortunately you cannot access the internet at all from the client computers. What kinds of utilities you can use to test the internet connection?

Internet connection diagram

Check the IP Configuration

The easiest way to check if the system is properly configured is using the desktop computer with the wired connection to the router. Firstly you need to check the IP address configuration of the desktop PC using the Windows command prompt and ipconfig /all utility. Assume that the router IP address is 192.168.1.1 and the DHCP server feature is enabled (by default). DHCP server will provide the IP configuration automatically to the client computers in the network.

Type in from the DOS prompt C:/> ipconfig /all and press <Enter>. The screen result will be like this:

Windows IP Configuration

 
Host Name . . . . . . . . . . . . ….: TOWER
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . …… : Unknown
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . : No
Ethernet adapter Internal LAN:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . ..: Realtek RTL8139 Family PCI Fast Ethernet NIC #2
Physical Address. . . . . . . . : 00-1C-F0-B9-F2-A9
Dhcp Enabled. . . . . . . . . . : No
IP Address. . . . . . . . . . . . ..: 192.168.1.3
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . : 192.168.1.1
DNS Servers . . . . . . . . . . . : 202.134.1.10
202.134.0.155

Identify if the IP address configuration is correct. We can see from the dump screen that the IP address is 192.168.1.3, it looks that the desktop computer receives the IP address automatically from the router’s DHCP services. If you find that the IP address of the desktop computer is within the range of APIPA (automatic private IP address) which is between 169.254.0.0 and 169.254.254.254, this means that your desktop computer doesn’t receive the IP address automatically from the router. Check if the cabling is properly connected from the router to the desktop or replace the cable. See also the IP address Class.

Now if you find that the IP address configuration in the desktop is OK, test internet connection to the WAN cloud by running the ping command for example test the connection to the yahoo.

Pinging yahoo.com [98.137.149.56] with 32 bytes of data:
Reply from 98.137.149.56: bytes=32 time=358ms TTL=50
Reply from 98.137.149.56: bytes=32 time=359ms TTL=52
Reply from 98.137.149.56: bytes=32 time=474ms TTL=50
Reply from 98.137.149.56: bytes=32 time=367ms TTL=52
Ping statistics for 98.137.149.56:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 358ms, Maximum = 474ms, Average = 389ms

This screen result proves that your internet connection from your desktop to the router, to the ISP, and to the web site is OK.

You can do similar steps to check if the laptop with wireless connection is configured correctly. Check if it receives the IP address automatically and then test internet connection by ping to yahoo.


See also:

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July 5th, 2010 | Tags: | Category: Network Problem

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