If you are running a ADSL or ADSL2 Modem and your internet connection is not working, here are some basic steps which you can follow before calling any techsupport guy.
These Steps worked for MTNL, BSNL, Verizon, AOL and other telecom companies which provide internet connection through a phone line.
Broadly Internet connection does’nt work due to two reasons
1. Your modem is not getting proper signals from the central office or Telephone Exchange. (No Synchronisation)
2. Connection between your modem and computer is not fine. (No Route)
How to Recognise if there is a No sync or a No Route.
Thumb rule is if DSL or Link or Ready light on your modem is Solid green it means that your modem is in sync with central office and getting proper signals. If DSL or Link or Ready Light on your modem is blinking then its No Sync.
Troubleshooting guidlines for No Sync.
Restart the Modem before doing anything else.
1. Check if there is a Dial tone in the phone line….If not call your phone provider.
2. Check if your modem is connected properly to the phonejack via a phone cable….Try to swap the ends of the phone cable.
3. Check the modem is connected directly to the phonejack without any filter or splitter thing.
4. There should be a filter on all the analog devices which are working on the same phone line ex. Fax machine, Answering Machine etc. except MODEM (Modem should not be connected via a filter.
TroubleShooting guidlines for No Route.
1. Restart the modem
2. check the physical connection between modem and computer. Ethernet or Data light should be green on your modem
3. Ipconfig -Click Start > Run > Type “cmd” and click OK
and in the black screen type “ipconfig” and hit enter key.
IP Address………..192.168.1.11
Subnet Mask……….255.255.255.0
Default Gateway……192.168.1.1
(if could’nt get these results check the ethernet adapter and try to reinstall the drivers for the ethernet card)
4. Configure Modem.
Open the GUI of the modem by typing the default gateway of the modem in the Address Bar of IE or any other browser.
Put the Username and password provided by your ISP.
5. Ping google.com or any other website.
Click Start > Run > Type “cmd” and click OK
and try to “ping google.com”
If google is pinging you are good to go online.
If google is not pinging then try to ping google by its IP Address
6. ping 74.125.67.100
if google is pinging by the IP address and not by google.com
then go to Run> type “services.msc”> and click ok
and restart “DHCP Client” and “DNS Client”
7. Check TCP\IP Settings
“Lan connection > Properties > Internet Protocol (TCP/IP)” and click on “Obtain an IP Adresss automatically”.
8. Reset Socket files….God Command to fix your internet connection!
Click Start > Run > Type “cmd” and click OK
and type “Netsh Winsock Reset Catalog”
and then restart the computer. (This command runs only on windows XP SP2 or Higher Versions)
9. Disable any firewall or any other Antivirus……Happy Browsing. 
Almost helped but not quite. I have a no route problem. My main computer has no trouble connecting to the router by cable or by wireless. When I try to connect my second computer by cable, IE "Cannot find server". If if do IPCONFIG on 2nd computer I get the proper name for the 2nd computer as 192.168.1.43, and the gateway is 192.168.1.1. But if I type http://192.168.1.1 in the IE address, I get Cannot Find Server page.
If I try to ping Google.net from 2nd computer CMD, the ping is returned ok.
If I use main computer to connect to 192.168.1.1, I can see that there is something at address 192.168.1.43 but it says "connection unknown".
I ran everything you suggested in your blog, but still the same result.
So it seems that my 2nd computer is online ok, but still cannot use IE. Any ideas why???
@MichaelKayun
1. check for any antivirus or any other security software on your computer. Try to disable it.
2.If google.com is pinging from CMD, it means that your computer is getting internet connection and only trouble is that IE is not working properly.
3. Try to optimise the IE "Tools>Internet Options> Delete Browsing History and Cookies".
and on the top of this window we have a "security" tab, turn security levels to "Medium-High".
and under content tab click "Clear SSL State"
and under "Advanced" tab click on ‘Reset’
4. If this does’nt work , try to install any other internet browser like Mozilla Firefox or Google Chrome.
@MichaelKayun
One more thing. Can you make sure that you have not enabled the proxy settings in IE.
Vaibhav and Aakash, yes, thank you, I uninstalled Norton Antivirus and I was able to connect to IE just fine. I had already disabled everything in Norton, but disabling was not enough, I finally had to remove it completely from the computer. It was already expired, so maybe it was an older version of Norton. I will sign up for a new antivirus program and hope I don’t have this trouble again. Thanks again, guys… Michael
I’m Glad, It worked.
Hi
I read this article. And found it really worked to get solution of frequent disconnection of MTNL Broadband. For past few days i was very tensed regarding the issue of internet not working properly. But I followed these steps mentioned and my problem got resolved. Thx a lot again
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