I've installed a ethernet cable based TV tuner (for USA it's ATSC). There are but 3 inputs to the tuner, the tv signal, power and an ethernet cable. That cable, connects (through unmanaged switches) to the router. On powering up the tuner, it boots and obtains an IP address but isn't found on my network.
What devices nmap shows are:
``Starting Nmap 7.60 ( https://nmap.org ) at 2019-08-03 09:24 PDT
Nmap scan report for OpenWrt.lan (192.168.1.1)
Host is up (0.00026s latency).
MAC Address: 18:D6:C7:24:82:B5 (Tp-link Technologies)
Nmap scan report for 192.168.1.184
Host is up (0.010s latency).
MAC Address: 6C:33:A9:13:D1:12 (Magicjack LP)
Nmap scan report for Lexington.lan (192.168.1.185)
Host is up.
Nmap done: 256 IP addresses (3 hosts up) scanned in 4.14 seconds
The makers [Troubleshooting](https://www.silicondust.com/support/troubleshooting/#no-tuners-found) guide reads: "If the network LED is solid green, then the HDHomeRun has an address. If you are on a wired connection and it is still not discovered, if you have the PC configured to use a static IP address, check to make sure that the subnet mask entered exactly matches what the router is assigning via DHCP. Any mismatch, no matter how small, can prevent discovery of the device from working." In email correspondence with Tech Support at SiliconDust, the maker of the tuner, they suggest setting a static IP address for it. Also in the LuCI menus, where are the "allowed devices"? I've looked. Thank you. To be certain that the router issues IP addresses to devices, I have cold booted the router. This is the 3rd device that SiliconDust (the manufacturer) has sent me. I bought this model "refurbished". The first unit was found and worked without flaw for months but died. It was under warranty to another device was sent. It too could not be found on the network, and now this 3rd one, delivered to me yesterday also can't be found.