What should I be using. When I put my second network adapter card in my computer and hooked up the lights I had trouble getting them to work. I remembered something about turning off IPv6 on our network at work so I unticked that option in the properties and set the ip address on the IPv4 tab to the same range as the controller and the problem went away. Never thought about it again until the other day after finding out about multicast and IGMP and I looked up the properties on my other network card (one that was in there when I bought the computer and I think it may be part of the motherboard but don't hold me to it). Then noticed it had both IPv4 and IPv6 ticked and that it was DHCP enabled so all IP addresses are automatic. Obviously there has been no issues getting onto the internet etc but I haven't used that port to run my lights at all. Just wondering out loud, is one protocol better than the other. Would my internet connection run any better/faster if I unticked one of the options. If it turns out IPv6 is better how can I change my light port back to that and get it to work. Thanks.