On Tue, 18 Mar 2025 18:54:34 -0300, altoid wrote in message
<67D9EB9A.31828.C97FD7@???>:

> Hello:
>
> On 19 Mar 2025 at 7:37, Ralph Ronnquist via Dng wrote:
>
> > RTFM :)
> Right.
> Thanks for the heads up. 8^D
>
> > ... been part of the Dynamic Host Configuration Protocol (DHCP) for
> > a very long time ...
> I see.
>
> From what I have seen and read on the web, the great many complaints
> from users that did not take kindly to their DNS settings getting
> changed without notice *also* seem to have started a long time ago,
> impossible for me to say with any certainty if both timelines match.
>
> What I can say is that that specific part of the DHCP ended up being
> a severe nuisance till I decided to drop [connman] and use
> [ifupdown].
>
> Out of nowhere my [Pi-hole] seup was no longer working because my
> headless VM had stopped being my DNS, without my intervention or
> knowledge.

..a shot in the dark: Does your headless Pi-hole VM run systemd?


..from https://github.com/pi-hole/docker-pi-hole/ :
"Upgrade Notes
Caution

!!! THE LATEST VERSION CONTAINS BREAKING CHANGES
Pi-hole v6 has been entirely redesigned from the ground up and contains
many breaking changes.

Environment variable names have changed, script locations may have
changed.

If you are using volumes to persist your configuration, be careful.
Replacing any v5 image (2024.07.0 and earlier) with a v6 image will
result in updated configuration files. These changes are irreversible.

Please read the README carefully before proceeding.

https://docs.pi-hole.net/docker/ "

..from https://pi-hole.net/landing/blog/#page-content :
https://pi-hole.net/blog/2025/02/21/v6-post-release-fixes-and-findings/#page-content
https://pi-hole.net/blog/2025/03/04/pi-hole-ftl-v6-0-4-web-v6-0-2-and-core-v6-0-5-released/#page-content

..how I understand they meant to have people do it:
https://docs.pi-hole.net/main/prerequisites/ which alleges:
"Pi-hole is supported on distributions utilizing systemd or sysvinit!

Supported Operating Systems¶
The following operating systems are officially supported:

Raspberry Pi OS (formerly Raspbian)
Armbian OS
Ubuntu
Debian
Fedora
CentOS Stream
Pi-hole only supports actively maintained versions of these systems.",
which are all systemd distros.
(Does the
https://forum.armbian.com/topic/18122-replace-systemd-with-sysvinit/
recipe ideas still work with Armbian or Raspberry Pi OS?)

..a Pi-hole-in-Docker way I googled:
https://pimylifeup.com/pi-hole-docker/


> > ... clients typically have configuration options whether to request
> > domain settings from the DHCP server or not.
> I see ...
> [connman] and [network-manager] seem to do so.
> WiCD did not and *that* was what I was used to.
>
> ie: that my DNS settings were *my* DNS settings and not my ISP's.
>
> > ... dhclient is configured in /etc/dhcp/dhclient.conf ...
> > ... requests those by default ...
> > ... would have to change that configuration to not do so.
> I see.
>
> That would be here:
>
> [code]
> --- snip ---
> send host-name = gethostname(); request subnet-mask,
> broadcast-address, time-offset, routers, domain-name,
> domain-name-servers, domain-search, host-name, dhcp6.name-servers,
> dhcp6.domain-search, dhcp6.fqdn, dhcp6.sntp-servers,
> netbios-name-servers, netbios-scope, interface-mtu,
> rfc3442-classless-static-routes, ntp-servers;
> --- snip ---
> [/code]
>
> ie: edit out [domain-name-servers]
>
> > ... probably true that the script you found implements the
> > handling of that part of the response ...
> > ... also possible to address it by changing that implementation.
> Right.
>
> Evidently the [connman] and [network-manager] developers just made
> use of what the DHCP configuration offered, albeit without much
> thought about what the average Linux user might actually want to do
> with their DNS settings.
>
> I mean, just *what* were they thinking ...
> Windows?
>
> In any case (in my opinion) the problem lies with the DHCP
> configuration and how it is implemented, no matter how long ago that
> was.
>
> So maybe the meta-package I suggested would have to address
> [/etc/dhcp/dhclient.conf].
>
> Thank you very much for setting this straight for me.
>



--
..med vennlig hilsen = with Kind Regards from Arnt Karlsen
...with a number of polar bear hunters in his ancestry...
Scenarios always come in sets of three:
best case, worst case, and just in case.