It’s a long shot Warren but the eero app has an advanced setting to disable UPnP. It is enabled by default but could have become disabled by accident or “random weirdness”. You could double check that setting if you summon the energy for another try.
Hi @struts001
This is one of those “global misunderstandings” I’m afraid … the “Disable UPnP” option on a router simply stops the router being automatically reconfigured by A.N.Other program running on your network sending it UPnP commands to change how it is configured (i.e. forward ports etc.) … it doesn’t enable and disable UPnP traffic on the network as a whole.
Thanks Phil. I stand corrected!
Warren, as I posted previously in this thread, the possible reason why the Eero could be causing problems for Mosaic is that it works unreliably for (mDNS) multicast packets which Mosaic depends on for discovery of dCS components. “Unreliably” as in it occasionally drops such packets which would result in Mosaic working sometimes and sometimes not.
Also, the problem may be exacerbated by your numerous other downstream network elements.
What brand/model is that Switch upstream from the EtherRegen? And why not just connect the EtherRegen A-side directly to your Eero while it’s B-side is connected to your dCS kit??
@Anupc My thanks for your response…
…to your query, the switch is an unmanaged Netgear which was chosen as it has an SFP box for the Amphenol CAD which then tucks into the SFP “B side” then copper out from the ER “A side” to the Bartok.
…so, in the past, the Eero passed Mosaic without exception but then once adding the ER and these little bits, SFP and CAD cable, linear power supplies, etc… it all fell apart. Hence was trying to recreate the arrangement before the changes were made as described above. Networks are so completely cranky to this novice.
If proper isolation is what you’re going for, the Netgear Switch + Amphenol DAC won’t deliver that since they’re all galvanically connected, so they’re completely superfluous and just complicating your life 
You might want to try with just the Eero and directly connected EtherRegen (side A), and use side-B for your dCS kit. Skip the Netgear/SFP-DAC totally, it’s a waste of your money in this context.
Ouch…! All of these additions were, to our ears, an improvement. Sounded better!
Thought the advantages of SFP was to eliminate galvanic influence.
W
But will try your suggestion
Optical SFPs yes. Not Direct Attached Copper Cable SFPs like the Amphenol.
So, please, why a DAC?
I don’t quite get your question Warren, why a DAC what? 
Just to be clear though, Direct Attached Copper Cables (both Passive, and Active) do not provide galvanic isolation between the network Switches attached on either ends of the cable.
If absolute galvanic isolation is what you’re looking for, you need either Fibre + Optical SFPs (consumes more power and slightly more expensive), or Active Optical Cables (AOCs).
Direct-Attach Cables (more often referred to as TwinAX cables) were invented to replace short SFP-fiber-SFP runs, as they are way cheaper (at least they used to be much cheaper. Perhaps not the case anymore with today’s SFP prices). But, they do not provide galvanic separation, and they radiate EMI.
It was on the recommendation of UpTone (manufacturer of the EtherRegen) that led me to this purchase. Perhaps I’ve misunderstood this issue.
From another thread and poster:
"The concept behind the DAC being better is that it doesn’t have to make the conversion to optical, thereby cancelling two points of electrical activity. My opticalModule actually runs almost cold compared to the mini heater it was with an SFP inserted "
I’m not sure what to say really, other than perhaps that there’s a lot of pseudo-science posted among Audio forums (including/especially from the likes of UpTone 
)
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Anup,
Not disputing you at all…just realize I need a better understanding of these issues…somewhat sad that a state of the art music server requires more than a passing knowledge of electrical design and network protocol.
Lots of very happy Uptone users, though
Cheers,
Only because those happy UpTone users don’t know any better; EtherRegn doesn’t deliver any benefit that can’t be achieved at a fraction of what they sell their Switch for.
Lots of ER users on this site…are they all deluding themselves? Seems a tad severe.
No, not at all actually. Just that with a little due diligence, it’ll be clear that there are many non “Audiophile-grade” networking products from actual networking suppliers that do a better job than the EtherRegen.
IMHO, UpTone thrives on consumers who are relatively unfamiliar with networking, and proceed to market-spin & price their products to take advantage (they’re not the only ones of course).
Hello All, I have misrepresented Uptone’s recommendation of the Ampherol CAD…their opinion is far more nuanced that I had stated above. See the thread link if interested. Apologies for any confusion.