Re: debian12: something destroys /etc/network/interfaces at boot
On Tue, Mar 26, 2024 at 06:33:42PM +0100, Steffen Dettmer wrote:
> I changed a gateway on a remote site using /etc/network/interfaces by
> changing gateway. However, at reboot some old gateway IP reappears.
So then the question is *which* of the many different subsystems is in
use to set the system's default gateway. It might be coming from /e/n/i
or from NetworkManager or from systemd-networkd or others.
> 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
See, that's not useful. That's not how this file is structured. It's
NOT just a series of independent lines.
We would need to see the entire /e/n/i file to know which interface
that gateway definition is associated with, and so on.
A gateway definition on an interface that isn't managed by /e/n/i (ifupdown)
will do nothing at all. For example, you might have an eno1 definition
which includes a gateway line, but which does *not* have an "auto eno1"
line to activate it -- in which case the interface might be managed by
NetworkManager instead, or something else.
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