Re: Under each of these scenarios, what is the neatest and simplest way to manipulate the /etc/network/interfaces file?

[Tim Woodall <debianuser@woodall.me.uk>]

On Sun, 20 Mar 2022, David Wright wrote:

> On Sat 19 Mar 2022 at 03:14:54 (+0100), Stella Ashburne wrote:
> > There are instances in which my machine is connected to a mobile hotspot. And in some situations, it's connected to a smartphone via USB tethering. And when I'm in the office, I may connect it to a LAN cable.
> >
> > Below are the contents of my /etc/network/interfaces file:
> >
> > # This file describes the network interfaces available on your system
> > # and how to activate them. For more information, see interfaces(5).
> >
> > source /etc/network/interfaces.d/*
>
> I would change this line to
>
> source-directory /etc/network/interfaces.d
>
> (which was the default on new buster installations).
>
> I would then hive off all your interface configurations into
> separate files in the directory /etc/network/interfaces.d
> using all-ASCII filenames constructed from upper/lower-case
> letters, digits, underscores, and minus-hyphens, as specified
> on the man page, but with the string ".hidden" added to the end,
> thus:
>
> myphone-tethered.hidden
> office-wired.hidden
> wifi.hidden
> hotspot.hidden
>
> and so on. Files with a dot are ignored when included by means of
> a source-directory directive.

I think just commenting out the allow-hotplug lines is sufficient. Then
you can use ifup/ifdown at will. The only 'problem' will be that an
interface doesn't start at boot.

(I'd second splitting into separate files anyway)