@lxLondon wrote: The BT Smart Hub has 4 ports in the back. Port 1 is used for the MX64 and Port 2 for the BT TV Ultra HD box. It's a simple solution with the downside that the TV box is not in the Meraki network. I asked if you were using the second LAN port on the modem as you claimed to have attached the BT TV Ultra HD box to a "BT modem".   However, it transpires that you have actually attached it to a BT HomeHub router.   As you say, what you have done "works", but, unless BT has upgraded the HomeHub recently, you may have potential Double-NAT issues.   I am not quite sure what the downsides are in connecting the STB to the BT HH compared to attaching it to the MX/MS stack.   In our analytic network, we have dual stacks. The BT STB is connected by Ethernet to a switch on the non-Meraki stack (which supports IGMP-Proxies and Snooping). The STB is connected to a TV by an HDMI 2.0 cable. The TV is connected to a switch on the Meraki stack using an Ethernet cable. This is a rock solid arrangement. We are not interested in how much bandwidth the STB consumes, we have "plenty", and the statistics are available on the third-party dashboard, we do check it to ensure that there is no multicast traffic leakage.   It would be interesting to know if the BT HH reflects multicast video steams out all the LAN ports.   ... View more