I have never seen a modem with an HDMI connection. You should be able to connect your blu-ray player to your network either by Cat5/6 cable or wireless depending on the model. If all you have is a cable modem, you may also need to purchase a router (wired or wireless) in order to use multiple devices at the same time. Once connected, as long as your blu-ray player supports netflix, you can connect directly from your blu-ray player to stream movies. The HDMI port on your blu-ray player will either go to your TV or AV Receiver.