Hi,
You are posting in the older DNS-320 forum, there is a new forum under the cameras area. But if you are totally new and cannot get into your 320L setting yet, just log into your router and look around in there for "system status" or "devices" or whatever, all of the devices connected should be in there and so will there MAC ID's. By the way, when you go to setup your DDNS account, you have to put ":" between each pair of numbers. Good luck