In answer to your questions, ifupdown 0.8.44. RaspberryPI Debian GNU/Linux 13 (trixie).
I purged ipupdown then reinstalled and /etc/network/interfaces wasn't touched, so didn't reproduce the problem. At some time during my fumbling to get the net up again /etc/resolv.conf got scrubbed. Don't know how. I've been running Linux for years and done some programming professionally which only means I'm not a newby not that I can't make mistakes. Likely this is one of them. Sorry for the noise. Have a good weekend, Mike McClain On Fri, Nov 07, 2025 at 03:20:50PM +0100, Daniel Gr??ber wrote: > Package: ifupdown > Version: 0.8.44 > X-Debbugs-CC: [email protected], [email protected] > Control: tags -1 + moreinfo > Control: submitter -1 [email protected] > > Hi Mike, > > On Fri, Nov 07, 2025 at 08:05:11AM -0600, [email protected] wrote: > > mike@RPI2:~> uname -a > > Linux MikesPI 6.12.47+rpt-rpi-v8 #1 SMP PREEMPT Debian 1:6.12.47-1+rpt1 > > (2025-09-16) aarch64 GNU/Linux > > Is this on pure Debian or a derivative? What version of ifupdown? > > > apt install ifupdown over wrote /etc/network/interfaces replacing this: > > > > # /etc/network/interfaces Sun 7 Apr. 2024 18:26 mc > > source /etc/network/interfaces.d/* > > > > auto lo eth0 > > # iface lo inet loopback > > iface eth0 inet static > > address 192.168.1.2 > > netmask 255.255.255.0 > > gateway 192.168.1.1 > > broadcast 192.168.1.255 > > dns-nameservers 192.168.1.1 > > > > with this: > > > > # interfaces(5) file used by ifup(8) and ifdown(8) > > # Include files from /etc/network/interfaces.d: > > source /etc/network/interfaces.d/* > > > > without even backing up the original. > > I'd suggest that is but in your install script. > > We have the following in postinst: > > if [ "$1" = "configure" ] ; then > # We don't need loopback interface definition anymore as > # ifupdown handles loopback interface on its own from now > if [ ! -f /etc/network/interfaces ] ; then > if [ -z "$2" ]; then > echo "Creating /etc/network/interfaces." > echo "# interfaces(5) file used by ifup(8) and ifdown(8)" > > /etc/network/interfaces > echo "# Include files from /etc/network/interfaces.d:" >> > /etc/network/interfaces > echo "source /etc/network/interfaces.d/*" >> /etc/network/interfaces > else > report_warn "/etc/network/interfaces does not exist" > fi > fi > fi > > [ -z "$2" ] is true if we're installing for the first time, not upgrading > which I gather was also true in your case? > > [ ! -f /etc/network/interfaces ] should protect an existing config file > here. > > This being an on an embedded plantform I wouldn't discount random bitflip > as being the underlying cause ;-) but really we need more clues. Can you > reproduce the problem? > > --Daniel
