Hi I bought the Wifi modem TP-Link 3420 recently but it is not working wiht my modem.I did a quick setup and it didnt work so went abt troubleshooting - And upgrated to latest firmwars from TP-Link.But that too didnt work, and so i looked over and airtel uses PPPoE for connection - Which when i am trying to set in my Wifi device asks for username and password which i am not aware.Wht shd i do now to both of it work???Any help is greately appreciated!!Abhi