MSGID: <10j335s$2gptg$10@dont-email.me> 26a4ee5c
REPLY:  59942167
PID: PyGate 1.5.2
TID: PyGate/Linux 1.5.2
CHRS: ASCII 1
TZUTC: 0000
REPLYADDR tnp@invalid.invalid
REPLYTO 3:633/10 UUCP
On 30/12/2025 21:07, Jim Diamond wrote:
> All good thoughts, thanks.  But...
> - There is no dhcp client running (at least by the time I am able to ssh in
>    to the machine after it boots).
> - All /etc/network/interfaces does is source any files in interfaces.d,
>    and there are no files there.
> - "sudo locate systemd.network" only shows the man page.
> - the "mystery" IPv4 address doesn't show up anywhere in the
>    /etc/NetworkManager directory or sub-directories.
> 
> I guess the mystery continues.

That was where I got to with my one.

At some stage that mobo died and I took the opportunity to switch mobos 
and install an updated linux version, using a GUI and network manager to 
set up the fixed IP, and the problem vanished.

If you can do a fresh install its probably the shortest route.

Now even if its headless there is a CLI to network manager and you might 
investigate that.

It's called in a fit of stunning originality, 'nmcli'

Try
#nmcli device show

Also ifconfig -a should show up any active interfaces on odd addresses.

BUT IIRC I never could identify that interface that way - it seemed to 
be some sort of low level zombie.

It existed in the router DHCP table, showing it had been issues by the 
router in response to a request from the machine, but it only ever 
responded to pings, IIRC.

No listening process beyond that was ever bound to it.

I assumed it was some bug either induced by me hand editing files that 
network manager was supposed to edit, or as a changeover from earlier 
methods of setting up IP, not fully ignored by the new NM control system

All I know is that rigorous adherence to the GUI CLI on a fresh install 
eliminated it. Whether it was one or the other factor that was crucial, 
I cannot say.
As with most transient bugs, life is to frikkin short...

I am sorry I cannot help beyond noting that yes, I have seen it happen, 
and no, I cant reproduce it any more, and at a given point it vanished, 
never to reappear...


-- 
Microsoft : the best reason to go to Linux that ever existed.


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