@grhitesh man u r genius ..thanks a lot for this MTU setting issue contained in the above thread.
i entered a random value although my modem doesnt allow value '0'. i changed it from 1492 to 578 . i m using an intex adsl wireless router n bingo ..the sites are opening like butter. nothing else i changed m using pppoe . auto connection mode dont have to dialup ..
edited by moderator: Added link to thread by grhitesh