Originally Posted by gbynum
I BELIEVE that if he has the IP of his computer and puts the device on the same subnet, they can intercommunicate over a hub/switch, but his device will not communicate with the internet.I heartily agree; there are many who canhelp him with problems he might find, and IMO the NAT gives another layer of protection in the internet connection. I've put more than one in friends homes THINKING I'm giving a protection layer. If I enable wireless, it will have some strange ID and secure password which I'll put on a sticker on the unit. I occasionally don't enable DHCP, using fixed IP.
Sorry to confuse the issue everyone, but this is correct. I purposely did not mention NAT and DHCP at the modem level so as not to make it sound even more complicated. I was mainly addressing the issues at the subnet level because the OP did not mention what kind of internet connection he has.
I have had the following setup for many years now with no problems whatsoever: Single ethernet port DSL modem with NAT enabled and DHCP turned off > switch > network with four computers on a subnet. I can unplug the modem and still use the home network without any problem. No router is needed. Before this I had a modem/router and I had no end of trouble getting everything to talk to each other every time I made a change to the network, mostly due to endless rebooting before everything would work. I'm very happy using static IP addresses now, but the learning curve is more involved.
This conversation has gone way beyond what the OP needs. If his modem has multiple ports with routing built in, all he has to do is run a wire or go wireless to his Blu Ray player. If he needs more ethernet ports, I would recommend a switch and not a hub.