Wanting to keep the cameras from phoning home to China or other mischief. Some will be in a detached garage on a wired POE switch and some in the house. Can I keep the traffic separate with one cable between buildings or do I need two? Want to set up a NVR, probably Zoneminder, that I can access from the home network but would like to keep the cameras off it or limit their connection to only the NVR. What's the best way to do this? I set up my own network with static ip for some devices but don't have a lot of network experience so some detail would be helpful. Router is running ddwrt.