From: tnp@invalid.invalid   
      
   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.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)