Lets start our internet troubleshooting campaign with the BSNL connection one of the most sought after as they provide a good 2Mbps connection.

This guide is especially for DATAONE MODEM users

Goto any browser of your choice

Type 192.168.1.1 in the address bar

if you get a login screen as below then goto next post

otherwise just goto START--->CONTROL PANEL->NETWORK CONNECTIONS-->LOCAL AREA CONNECTIONS

right click on it select properties and select TCP/IP and select PROPERTIES and set IP address as 192.168.1.2 and subnet mask as 255.255.255.0 and sefault gate way as 192.168.1.1 and select save and close

click on ADVANCED SETUP

select WAN

you will get a screen as below in case the modem is preconfigured

otherwise there will be no connection shown

Now click on ADD

vpi  VALUE AS 0

vci VALUE AS 32

SET service category AS UBR Withot PCR

click on NEXT

select PPP over ethernet(PPPoE)

encapsulation mode as LLC/SNAP BRIDGING

click next

set authentication mode to auto

enable bridge pppoe frames between WAN and Local ports(default enabled)

CLICK NEXT

click on enable wan service
click next 

SAVE THE CONFIGURATION AND REBOOT

With the exception of your DSL router, ensure that all devices plugged into the phone line, including fax machines, satellite receivers, and alarm systems, have a DSL line filter on them. These filters prevent interference with your DSL signal. The DSL router should be the only unfiltered device on the phone line.

In case of PPOE login into the modem and check if the PPPOE id password are correct.

More information on logging into the modem and PPPOE will be posted later

If possible, remove any Inrtermediate devices that sit between your computer and the DSL router.

They may be

Hubs

Wireless routers

Network switches

Vonage phones

VOIP phones

Wired Routers etc........

Connect your computer directly into the DSL router so that you can eliminate the

possibility that another device on your network is causing the problem.