If i connect my broadband line direct to my pc it works fine but if i connect it to my router the internet speed become very slow and very unstable. When i checked my ping/packetloss with google server and other serves it shows huge packet loss. I also tried previous firmware but it didn't help same problem occured.

i borrowed my friends router and that router worked fine so i can say that the isp line is ok.
i am confused and i need solution.
Please HELP!!!