On 6/15/25 1:11 AM, Tim via users wrote:
On 6/14/25 10:04 PM, Tim via users wrote:
USB device
10.42.0.254
| <-- Top half in same IP range
| as themselves (first three
10.42.0.1 quads match each other).
PC-A
10.42.1.1 10.42.1.2
| | <-- Bottom half in their own IP range,
| | same as themselves, different from
10.42.1.3 10.42.1.4 the top half (first three quads
PC-B PC-C match each other, & don't match the
top half).
Samuel Sieb:
You misunderstood the situation.
Well, I wouldn't be surprised, but his first paragraph seems to
describe what I thought it did (though I could read into it that even
more PCs are connected behind PC B & C).
Bearing in mind that the top of my diagram starts with a USB connection
between USB device and PC-A, not ethernet. Those IPs are simply the
interface IPs on those devices, whatever kind of interface it is.
There are two ethernet ports with one computer connected to each one.
And that doesn't seem any different.
The internet is connected through the USB interface. Then there are two
RJ45 ports, one for each of B and C.
So the first computer that boots, regardless of which port it's
connected to, will activate the port and get the first IP range. The
second computer will get the next range on the other port.
Which is the haywire bit...
If the network is configured well, it's not random assignment. But
checking what device is connected, whichever port it's on, and giving
that device a particular IP you want it to always use.
This is the default configuration of the "shared to other computers"
option. Normally, you would only have one interface with that option
and you don't care what IP addresses the attached computers get, but in
this case there are two interfaces. The Gnome network configuration
doesn't let you set a subnet for the interface, which is why it depends
on which computer of B or C connects first. nm-connection-editor lets
you set a fixed subnet.
--
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