connecting to bsnl broadband in ubuntu

The process in Ubuntu is very Simple
Go to System>Adminstration>Network>Ethernet
The following details:

IP: 192.168.1.100
Subnet:255.255.255.0
Default Route:192.168.1.1

DNS:
Primary: 208.67.220.220
Secondary: 208.67.222.222

For PPPoE(Always on), only this much is needed

Now, if you want to configure in Bridge Mode, then open terminal via
Applications menu -> Accessories -> Terminal
and enter command sudo pppoeconf

Keep on pressing enter. Fill in your user name and password when indicated.
It should be easy to stick on to defaults.

Post back,in case of problems