I have shown below an iball router configuration page for BSNL broadband connection
where VPI/VCI value is placed as 0/35. Rest of the values will remain same no matter
which ISP you are using.
Now, look at the chart for VPI and VCI value of your ISP and put it on the respective
field.
Now select ISP as PPPoA/PPPoE.
Servicename - You can put any name here. Does not really matter. If you are using
BSNL broadband then put it as 'BSNL'.