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Re: debian12: something destroys /etc/network/interfaces at boot

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As it's a PVE kernel I guess you rely on Proxmox.

*Theoretically*, Proxmox VE uses /etc/network/interfaces.new to apply
its config and potential manual changes made by an administrator
(changes that should be applied afterwards via ifreload).

I'd wonder whether this mechanism is not the cause if your troubles.
-- 
PEB

Steffen Dettmer <steffen.dettmer@gmail.com> wrote on 26/03/2024 at 18:33:42+0100:
> Hi,
>
> I changed a gateway on a remote site using /etc/network/interfaces by
> changing gateway. However, at reboot some old gateway IP reappears. I
> really hate when some magic knows better than an explicitly set value.
> What happens here? How can I get rid of this? It is 100% reproducible.
>
> I have no clue where the wrong 2.43 comes from.
>
> Any hints appreciated!
>
> Steffen
>
>
> root@site4-nas:~# ls -l /etc/network/interfaces
> -rw-r--r-- 1 root root 117 Mar 26 18:19 /etc/network/interfaces
> root@site4-nas:~# grep gateway /etc/network/interfaces
>         gateway 192.168.2.43
> root@site4-nas:~# perl -npi -e 's/gateway 192.168.2.43/gateway
> 192.168.2.1/' /etc/network/interface
>                                         s
> root@site4-nas:~# grep gateway /etc/network/interfaces
>                                                     gateway 192.168.2.1
> root@site4-nas:~# ls -l /etc/network/interfaces
> -rw-r--r-- 1 root root 116 Mar 26 18:21 /etc/network/interfaces
> root@site4-nas:~# sync
> root@site4-nas:~# date; sleep 1m; date
> Tue Mar 26 06:21:47 PM CET 2024
> Tue Mar 26 06:22:47 PM CET 2024
> root@site4-nas:~# ls -l /etc/network/interfaces
> -rw-r--r-- 1 root root 116 Mar 26 18:21 /etc/network/interfaces
>
> OK, so gateway is correct in 18:21 timestamped user config file. Lets reboot.
>
> root@site4-nas:~# reboot
> root@site4-nas:~# Connection to site4-nas closed by remote host.
> Connection to site4-nas closed.
> root@site4-pve:~# ssh site4-nas
> Linux site4-nas 6.5.11-8-pve #1 SMP PREEMPT_DYNAMIC PMX 6.5.11-8
> (2024-01-30T12:27Z) x86_64...
> Last login: Tue Mar 26 18:20:50 2024 from 192.168.2.28
> root@site4-nas:~# ls -l /etc/network/interfaces
> -rw-r--r-- 1 root root 117 Mar 26 18:23 /etc/network/interfaces
> root@site4-nas:~# grep gateway /etc/network/interfaces
>         gateway 192.168.2.43
>
> root@site4-nas:~# find /etc /lib/systemd/ /var/lib/ -type f -print0 |
> xargs --null grep 192.168.2.43
> /etc/network/interfaces:        gateway 192.168.2.43
>
> user config file has updated timestamp and contains bougous gateway.
>
> Help please!

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Thread

debian12: something destroys /etc/network/interfaces at boot Steffen Dettmer <steffen.dettmer@gmail.com> - 2024-03-26 18:40 +0100
  Re: debian12: something destroys /etc/network/interfaces at boot Dustin Jenkins <djenkins.cadc@gmail.com> - 2024-03-26 18:50 +0100
    Re: debian12: something destroys /etc/network/interfaces at boot Steffen Dettmer <steffen.dettmer@gmail.com> - 2024-03-27 00:30 +0100
  Re: debian12: something destroys /etc/network/interfaces at boot Greg Wooledge <greg@wooledge.org> - 2024-03-26 19:10 +0100
    Re: debian12: something destroys /etc/network/interfaces at boot Steffen Dettmer <steffen.dettmer@gmail.com> - 2024-03-27 00:30 +0100
  Re: debian12: something destroys /etc/network/interfaces at boot Pierre-Elliott Bécue <peb@debian.org> - 2024-03-26 19:20 +0100
    Re: debian12: something destroys /etc/network/interfaces at boot Steffen Dettmer <steffen.dettmer@gmail.com> - 2024-03-27 00:20 +0100
  Re: debian12: something destroys /etc/network/interfaces at boot Henning Follmann <hfollmann@itcfollmann.com> - 2024-03-26 20:10 +0100
    Re: debian12: something destroys /etc/network/interfaces at boot Steffen Dettmer <steffen.dettmer@gmail.com> - 2024-03-27 00:50 +0100
  Re: debian12: something destroys /etc/network/interfaces at boot Andy Smith <andy@strugglers.net> - 2024-03-26 20:30 +0100
    Re: debian12: something destroys /etc/network/interfaces at boot Steffen Dettmer <steffen.dettmer@gmail.com> - 2024-03-27 19:30 +0100

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