Originally Posted by Bman212121
I think you CAN use a switch with that device. There is an easy way to check. The device itself is using an ip adress, and would be acting as a bridge device. You don't need a nat or DHCP, since it should broadcast all lan traffic right through it. If you look on either your PS3 or 360 right now, you can see what IP your getting. I'm willing to bet your being assigned an IP by your router already. So if you add a switch, it will just pass that info right along to another device. The only difference between that device and a whole unit is that it doesn't have a built in switch.
If you were to buy that whole router thing, you'd be doing that same thing as just adding a switch to your 3420. The only difference is that unit has the switch built it, but it works the exact same way.
EDIT: I would suggest getting that switch you quoted in the first post, it's only $25 at BB.
After I read this I googled the DGL-3420 and found that it is indeed a wireless bridge. Saturnotaku check your wireless status window on your router and see how many IP addresses are on the list. You should have one for the 3420 (default is 192.168.0.30) and one for your Xbox. If this is the case then that 10/100 switch should work.