Trouble with 3 ATV to connect to iTunes in one WiFi / LAN

Question

Hi community,
I've trouble with my ATVs in my network. I have 1 3Gen. ATV connected via LAN to iTunes on iMac and 2 2Gen. ATVs via WiFi. The problem I am facing is, if I am connected with two of them to my iTunes Library the third can't even the others ( which have been conneted) are off. If I restart iTunes, I can connect again two of them and the third (doesn't matter which one) cannot. So I can circle arround which one gets connected but it is not very satisfying. 
My network is setup on two Airport express and a TC 2Gen to cover the whole house. As I stated above, the ATV 3Gen is connected via Lan, and the other two via WLAN?
Any idea what I've made wrong, or what to do to find the problem?
Thanks in advance

Answer 1

Until the MacBook Air was released and supported in 10.5, the Mac did not consider USB to be a valid Networking Protocol. So set the Mac with USB solutions aside.
To connect computer-to-computer, you typically need to be using an Ethernet crossover cable. Assigning the same address to two Ethernet devices is never the solution -- it gives a Network Conflict, just as you said.
If your Windows box has some mechanism for Sharing its WiFi connection over Ethernet, you would have to follow its rules. Whether that means Manually assigning an Ethernet Address in the same range or the PC will provide the Address, I do not know.
Best success may be running an Ethernet cable to your Wired/Wireless Base Station, or using a "gaming adapter" (Ethernet-to-Wireless no drivers required) connected to the Mac's Ethernet port to give it WiFi access. What is your Base Station {Cable, DSL, FIOS, Other} ? Ethernet cables can be up to 100 meters (an American Football Field). Often the Base Station can be moved closer for more convenience.