well ur cto connects u to a server at sify'sthis server is the sam serverthis server authenticates ur login requeststhis server maintains ur account usage logsand when ever ur net is connected but not working and u can also ping ur default gateway it means the problem is not at ur cto's endtry to open ur sam page if it doesnt opens then it means problem is with sifythats the benefit of knowing ur sam server addressnow sam server address can also changejust type that address i gave above agin to know the new addressbut the address doesn't changes unless there's some major upgradation