LAN connection troubleshooting:

Some of you must be having a broadband connection with an ADSL modem. It is possible that you might have come across a situation where the LAN connection icon on the task bar shows limited connectivity. When there is a limited connectivity you may not be able to access the internet or share files between the networked computers. How do you solve this problem?
First and foremost thing that you need to do when your system is networked is that you need to write down the IP address allocated to the computer, subnet mask and the default gateway. Please also jot down the main DNS server IP and alternate DNS IP and keep them handy. If you have not done that earlier, never bother. Right click on the LAN icon and select the repair option. The windows diagnostics tools repair the problem by changing the limited connectivity to full connectivity. Sometimes, it doesn’t work that way. Then, right click on the LAN icon and select the status.
In the popup window click the properties button and a next window opens with the list of properties. Here select the TCP/IP option and click on the properties button. In the next window there are two options- assigning IP automatically and the other assign IP manually. Select the first option i.e., assign IP automatically and then save the settings. This should solve the problem. Wait for two minutes by which time the system assigns an IP address and you can get back the full connectivity.
Even, if this does not solve the problem check the documentation guide provided with the ADSL modem where they provide you the IP address which you need to enter under the “assign IP address manually” and save the settings. Immediately after you enter the IP address and hit the tab button the subnet mask address is automatically entered. You need to enter the default gateway address which can be done by doing some guesswork. I will just show you with an example:
Go to the select IP address manually and enter the IP address: 192.168.1.1 (or whatever is given in the ADSL modem documentation). The subnet mask IP is 255.255.255.0 (this comes automatically). Now you need to enter the default gateway IP. Keep the first three numbers constant i.e., 192,168,1 and enter the fourth digit. It can be anything from 2 to 116 and then save changes. And this will solve the problem. Happy surfing.
Note: You need not assign the DNS IP manually, select the automatic DNS option.