Several Dell Windows 11 cannot use wired Ethernet but can use WIFI

Where would the dns data for local machines be registered in ?

Nowhere. Unless you’re running your own AD domain, and have dynamic DNS updates configured, the automatic updates sent to the ISP are just discarded.

There is non-active directory dynamic DNS, but no ISP would trust what a customer sends them. Enterprises use it though.

There are mDNSresponders too, but that’s a different protocol. Think Bonjour.
 
But if the local router assigned the dhcp leases, wouldn't it know the matching dns names ?
If that keyfob server thingie is named "computer2" and it has a dhcp lease from the local router - wouldn't that local router be the only one knowing that info ? It obviously won't upload it to the isp, but isn't that pretty much the only reason to keep a local router as a dns entry - to deal with the local network names ?

How will computer1 find computer2 if local router is not set as a dns entry - even if it's as the last one in the list ?

Or do the local computers broadcast locally and respond to local broadcasts ?
 
Nowhere. Unless you’re running your own AD domain, and have dynamic DNS updates configured, the automatic updates sent to the ISP are just discarded.

There is non-active directory dynamic DNS, but no ISP would trust what a customer sends them. Enterprises use it though.

There are mDNSresponders too, but that’s a different protocol. Think Bonjour.
Local DNS entries are typically stored by the gateway, which in this case, sounds like it's a Unifi device. It sounds like it's having some DNS issues, based on what I'm reading, just going through this thread now.
 
But if the local router assigned the dhcp leases, wouldn't it know the matching dns names ?

Usually, DHCP is independent of DNS.

I’ll defer to others for SOHO router features. I’m only familiar with ISP and large Enterprise stuff.
 
Aaaah, the real stuff :)
Envious I am.
I believe the local DNS info will be stored in the local SOHO router. Should be added as number three, or the entry for the keyfob system enterd in the hosts file, but why the hassle. Just add the local router as the third DNS device and see where it goes from there.
 
The Ubiquity gateway should (and is) providing the DNS resolution and DHCP addresses since it does all three. DNS and DHCP work dependently together. There generally shouldn't be a reason why a machine on a non domain network should have a manual DNS entry, unless for specific reasons. Generally speaking, manual ipv4 DNS on the PCs should be pointed at the gateway if anything and the gateway should be doing the forwarding.

Which comes back to the gateway being an issue. Have you already power cycled it and restarted the PCs afterwards and try it out?
 
I would see what your configured for.

https://lazyadmin.nl/home-network/unifi-loca

IMG_0470.webp
 
So more reading. It looks like the client PCs don't talk to the comm server PC by sending msgs over a TCP/IP port rather they share a folder of the comm server PC.

Maybe a public or private network setting is my problem now?
 
If one clicks Private vs Public network, I know it has to be Private for others to share your drives.

But does Private vs Public control if can share someone else's drives?
 
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If one clicks Private vs Public network, I know it has to be Private for others to share your drives.

But does Private vs Public control if can share someone else's drives?

The default public network category in Windows is set to not allow file and printer sharing, including the public user directory, and will not show up in another PC's network discovery. Private network does.

However, the two settings can be changed anyways, so the user can decide to turn on file and print sharing and network discovery for public networks anyways.

But they can still be pinged and found with an network scanner.
 
Are the laptops using a Dell WD19/22 USB-C/Thunderbolt dock by any chance?

There was an issue with the Realtek USB GigE PHYs on those that was fixed with the latest firmware update. We had a few at work that wouldn’t connect until that was done.
 
Are the laptops using a Dell WD19/22 USB-C/Thunderbolt dock by any chance?

There was an issue with the Realtek USB GigE PHYs on those that was fixed with the latest firmware update. We had a few at work that wouldn’t connect until that was done.
They are big old desktops
 
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