[ILUG-BOM] PPPOE related issues

Hi I use PPPOE (default implementation that came with Ubuntu 7.04) to connect to my ISP. Everything was fine for last two years. But from last three days, I am not able use Internet. I tried using Windows where everything works fine with the same settings. On "ifconfig -a", it shows the ppp adapter. But when I enter the URL in the browser it says "looking for google.co.in". I am not able to ping the DNS server. I think that its not getting DNS response. When I run the pppoe configuration utility, it fetches the DNS server address from the ISP. My friend who uses the same ISP has also reported the same problem with Ubuntu 7.04.

Can anybody help.