I have my home-office in a basement guestroom. This is also the room with the central electrical panel and where the cable-TV and satellite wiring come together. The cable modem that I use for primary internet access is located in that room and hardwired to it a firewall that I use to create a satellite to the main-office network. Now I need to create a wired connection from the 'safe' side of that firewall to two other rooms in the house. Wifi is out and I am not so thrilled about using an ethernet-over-powerline adaptor as the one I have is rather slow and not terribly robust (needs occasional re-setting to maintain its speed). The design of the house doesn't lend itself to the stringing of cat5 without having to drill through concrete and rafters. So if I could make use of some of the otherwise idle coax runs to carry network traffic it would really make my life easier. Does anyone have experience with consumer grade Coax MoCA adaptors (or any other method to feed ethernet via coax) ? What brands to use ? Any security issues to be aware of (is there a way to create 'pairs' of transmitters that only talk to each other) ? Thanks.