why is my bandwidth much lower now??

Ok, here is my problem, I recently replaced my modem through comcast. The old one finally died after 3 years. The issue I am having is that my download speed has decreased drastically since I installed the new modem. I have a belkin n+ router f5d8235-4 v3 is the model. I have a pc, a laptop and an xbox360 on my network. The pc, and laptop are both wireless and the xbox is wired. Before I replaced my modem my speedtest would be 9-10Mb down, and 2-4Mb up with 20ms ping. Now, the test shows 2.13Mb down and 2.15Mb up with 24ms ping. I know that the router divides the bandwidth between the devices on the network, however, I had the same three devices on the network before I replaced the modem and got way better test results....I play online shooters on my 360 and Call of duty BO has a bandwidth reading.My NAT is open, and my bandwidth is at 1,865kbs right now, as opposed to 10,000kbs before I replaced the modem. I just want to know what I can do to get my inet back to the way it was before. Thanks in advance, Brandon

 

Reset your router to default, try playing with the config's, or simply buy a new router, some routers are built better then others and handle different speeds better. Good luck!