You’re still not answering the OP’s question.
This model of hub can perform two functions:
One) it can act as a Wi-Fi mesh router, connecting directly to the Internet
Two) it can act as a home automation hub. It still needs an Internet connection because smartthings is mostly a cloud-based system, but it doesn’t have to itself be the Wi-Fi router.
You answered the question as though the OP was asking if the hub could be run without an Internet connection. But that is not the question being asked. The question being asked is if this specific model hub can run without having to be the Wi-Fi router for the home, but rather by connecting to a different Wi-Fi router.
The newest version of this device, the one that uses Plume, can probably do this, it depends on the specific model of the other router, but what you want to do is to put the smartthings device into “bridge mode.“ This tells it that it will not be the Wi-Fi router for the home, it’s just going to connect to an existing Wi-Fi network established by a different Wi-Fi router.
But I don’t know if the older model, the “connect home“ has that same option, which is why I haven’t responded in this thread before now.
This is how one connect home owner posted that they got it to work on Reddit:
This is how I have it setup:
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Connect your old router first and set it up as usual. If it’s a dual band router then set the SSIDs same as what you want.
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Connect the main Samsung Connect unit to one of the router’s ports and set it up as router mode. Set the SSID different than the one on 1)
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Once everything is setup, set the type to bridge mode
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Change SSID to 1)
But I honestly don’t know if that still works, there have been some firmware changes and a lot of app changes since that was posted a couple of years ago. And now most of the conversations are about the version with Plume.
Also note that the method given above is different than the official “bridge mode“ method
So… I understand the question, but I don’t know the answer. I think it might be possible to put the Samsung connect home into what is called “bridge mode“ which would avoid double NATing and allow the Connect home to just act as any Wi-Fi device connected to your other router. But thinking it’s possible and knowing it’s possible are not the same thing.
I’m going to tag @nathancu just in case he knows, but since this model has been discontinued and wasn’t that popular to begin with, I just don’t know how many people would have these details.