that is the problem with me. i have not entered anything in my resolv.conf file. then , how my machine is producing the right ip for yahoo.com by host command ? and also vice versa.
the server providing internet acces to us has following ports open as shown by nmap command.

22,23,25,53,80,110,113,139,143,389,443,515,548,312 8,980,981.

is that due to masquerading on the server ?