Reading your network description I’m not sure if the Linksys Velop acts as a router for the entire network or if some other device does it. To me it seems like DHCP doesn’t work which means the Nucleus doesn’t get an IP address and cannot be found because of this. Do you know which device does DHCP on your network? Is the Nucleus listed in the administration interface of that device?
No, the Velop is in bridge mode. In any case, I disconnected it to take it out of the equation. I guess the IP adress is given by my main router, or one of the switchers? Not sure how I can find out. In any case, I have multiple devices connected to the network (including an Aurelic Mini and an MSB network renderer, without any problems
Usually the router - in your case I believe it’s the “main router” - has some administration interface where you can check which devices are connected to the network. There you could find out if the Nucleus is present at all and what its IP address is. You’ll need to know the IP because it’s probable that you first need to update the Nucleus firmware as described here: https://kb.roonlabs.com/Updating_Nucleus_Firmware
What you could try from terminal in your macbook is typing arc -a and check what the output says. Any device listed that could be the nucleus? What’s the IP address of it? Can you then connect to the Web interface of the Nucleus using this IP address?
Last login: Sat Sep 15 13:19:02 on ttys000
[AntonioBPRetina:~] antonioballesteros% arp -a
mymodem.lan (192.168.1.1) at 30:91:8f:e3:31:fc on en0 ifscope [ethernet]
antoniobpretina.lan (192.168.1.7) at 20:c9:d0:48:1b:71 on en0 ifscope permanent [ethernet]
linksys34701.lan (192.168.1.15) at 58:ef:68:44:2c:14 on en0 ifscope [ethernet]
? (192.168.1.17) at (incomplete) on en0 ifscope [ethernet]
apple-tv-3.lan (192.168.1.30) at (incomplete) on en0 ifscope [ethernet]
? (192.168.1.52) at 0:23:c1:1:cc:86 on en0 ifscope [ethernet]
? (192.168.1.255) at ff:ff:ff:ff:ff:ff on en0 ifscope [ethernet]
? (184.108.40.206) at 1:0:5e:0:0:fb on en0 ifscope permanent [ethernet]
broadcasthost (255.255.255.255) at ff:ff:ff:ff:ff:ff on en0 ifscope [ethernet]
No harm in trying, also simplify the network for testing purposes, is the Nucleus + on fixed ip or dhcp, I would try downloading fing network scanner on the iPad and see what it sees, look for anything missing not just the Nucleus.
I have just subjected my network to the ultimate simplification:
I went down to the basement, took my main router, where the phone company connection enters my home. I took with me the Nucleus +, new ethernet cables, a second Mac with Roon newly installed, and an iPad with a Roon remote app also newly installed.
I connected by Ethernet cable the Roon and the Mac to two modem LAN ports in the router, which are placed next to each other. The usual green lights blinked at both sides of the two cables.
I started Roon.
I started the Roon apps in the Mac and in the iPad.
I selected Choose your Roon Core
“Looking for your Roon core…” without end.
I finally disconnected the cable that links the router to the switch to which all my devices are connected. Now, running the router interface, only the Mac and the Roon Nucleus should appear.
Guess what? The router interface only showed one networked device: My Mac. No trace of the Roon.