I have a Lumin D2 streamer and I’m about to take delivery of a Nucleus but I’m not sure how to connect them together. I had the ethernet cable from my router connected directly into the D2, but now I’m guessing that same cable will now connect to the Nucleus. Because the Nucleus only has one ethernet port, how can I run an another ethernet cable to the back of the Nucleus to the D2?
More or less. But the Nucleus and D2 can be in separate locations, so it may be easier to put the Nucleus next to the router–with a short cable–rather than running another cable to the same location as the D2.
You need one Ethernet cable for your Nucleus and one for your Lumin D2.
What @Jim_F was referring to here was if your router was much further from the Nucleus/D2, you could add a network switch in between them and use one Ethernet cable going from the router (into the switch) to split it into two Ethernet cables (coming out of the switch - one to the Nucleus, one to the D2).
Since your audio gear is next to the router, you will need to run that second cable to provide one to the Nucleus and one to the D2, which will both be connected to the router. Unless your router is using all of the Ethernet ports already, there is no need for the switch.