Re: non-existing interface problem
On Fri 12 Mar 2021 at 21:14:34 (-0500), The Wanderer wrote:
> On 2021-03-12 at 21:05, David wrote:
>
> > So I guess the answer is either in the kernel, or systemd,
> > but I don't know, and I found no further clues about that in
> > either the Arch Linux wiki [1] or the Debian Reference [2]
> > or the Debian wiki [3].
> >
> > So I will stay silent now and wait for someone who knows more
> > to answer :)
> >
> > [1] https://wiki.archlinux.org/index.php/Network_manager
> > [2] https://www.debian.org/doc/manuals/debian-reference/ch05.en.html
> > [3] https://wiki.debian.org/NetworkConfiguration
>
> I wouldn't say that I particularly know more; in fact I may know less.
>
> However, if I were encountering such symptoms and had (as has apparently
> happened here) searched the system for mention of the key term 'wwan'
> without finding it, the next places I'd look for clues would be A: dmesg
> and B: the contents of /var/log/. (If running systemd, I'd probably also
> want to investigate the contents of the journal, but I don't know proper
> syntax for that beyond the name 'journalctl'.)
>
> It might be necessary to make sure you're booting with appropriate
> message verbosity; IIRC, systemd may default to a quieter boot than
> sysvinit does, so you may have to adjust some grub parameters and
> reboot. In principle, however, I'd expect that if such devices are being
> set up at boot time there'd have to be some details about that logged
> during the boot process, and such logging would have to go to one or
> more of those three places.
I don't know what Debian or kernel the OP is running.
Googling linux kernel wwan device throws up
https://lore.kernel.org/netdev/20200225105149.59963c95aa29.Id0e40565452d0d5bb9ce5cc00b8755ec96db8559@changeid/
which suggests a mobilephone-type device.
BTW /etc/udev/rules.d will only be populated if you put your own stuff
there (like I do); it belongs to the sysadmin. The system uses /lib
and /run.
Cheers,
David.
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