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Re: iwd + systemd-networkd + resolvconf wrinkles

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On Mon 14 Mar 2022 at 07:15:12 (+0000), Thomas Pircher wrote:
> David Wright wrote:
> > I was casting round for a simple way to run iwd + resolvconf +
> > systemd-networkd as replacement.
> 
> I run a similar setup, with iwd, systemd-networkd and systemd-resolved.
> This has been working without problems on my host for for quite a while
> now.

As I said, I tried that.

> Make a copy of your /etc/resolv.conf file,

No point, as there's nothing specific in it, but just what gets sent
by DHCP from the router.

> then enable and restart the
> systemd-resolved service. Finally link the /etc/resolv.conf file to
> either /run/systemd/resolve/resolv.conf or
> /run/systemd/resolve/stub-resolv.conf.  I use the latter:
> 
> # ls -l /etc/resolv.conf lrwxrwxrwx 1 root root 37 Jun 28  2020
> /etc/resolv.conf -> /run/systemd/resolve/stub-resolv.conf

(It was created for me.) So, to summarise, I have a three-line
/var/lib/iwd/mySSID.psk (Security, PSK, passphrase), a two-line
/etc/iwd/main.conf (General, EnableNetworkConfiguration=true),
and nothing else: no overrides, no resolvconf package, and no
cat5 cable.

> You can configure various settings for the DNS resolver in your
> systemd-networkd setting and in /etc/systemd/resolved.conf.

Like what?

> On bookworm you also have the resolvectl tool, which helps debugging DNS
> issues.

And bullseye has that too. I don't really know how to use it.

There seem to be timeouts involved in most cases, so   time ping -c 1 foo
will typically take 15sec, and host lookups will take 10 or 20sec.
That's 10sec, or 20sec, depending on whether the message
  ;; connection timed out; no servers could be reached
is emitted once or twice.

I ran   resolvectl log-level debug   and tried    resolvectl query foo
on a few addresses. They were even slower, eg:

# resolvectl query smtp.lionunicorn.co.uk   answered in 57.6 secs.
# resolvectl query lionunicorn.co.uk   failed with:
lionunicorn.co.uk: resolve call failed: Query timed out

The debug output is difficult to interpret, though I did notice that
it was reporting "cache misses" repeatedly on the same address (but
there must be some caching going on, because there was an occasional
hit being reported).

I also noticed that debug output carries on being emitted after
the actual query has finished and returned to a bash prompt;
for something like another minute, achieving nothing (repeating
a query does it all over again).

Everything is comparatively instantaneous when using resolvconf,
which is why I chose to continue using it. The idea of "debugging
DNS issues" doesn't exactly thrill me. I'm imagining a scenario where
I'm sitting in an airport or motel room, having managed to make a
connection with iwd and negotiate their captive portal or whatever,
and then run into /this/ problem.

Cheers,
David.

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Thread

iwd + systemd-networkd + resolvconf wrinkles David Wright <deblis@lionunicorn.co.uk> - 2022-03-14 02:30 +0100
  Re: iwd + systemd-networkd + resolvconf wrinkles Thomas Pircher <thp.debian@p5r.uk> - 2022-03-14 08:40 +0100
    Re: iwd + systemd-networkd + resolvconf wrinkles David Wright <deblis@lionunicorn.co.uk> - 2022-03-15 19:40 +0100
      Re: iwd + systemd-networkd + resolvconf wrinkles Thomas Pircher <thp.debian@p5r.uk> - 2022-03-17 13:40 +0100
        Re: iwd + systemd-networkd + resolvconf wrinkles David Wright <deblis@lionunicorn.co.uk> - 2022-03-18 06:00 +0100
          Re: iwd + systemd-networkd + resolvconf wrinkles Nicholas Geovanis <nickgeovanis@gmail.com> - 2022-03-18 20:30 +0100
            Re: iwd + systemd-networkd + resolvconf wrinkles David Wright <deblis@lionunicorn.co.uk> - 2022-03-19 16:40 +0100
  Re: iwd + systemd-networkd + resolvconf wrinkles Brian <ad44@cityscape.co.uk> - 2022-03-17 00:00 +0100
    Re: iwd + systemd-networkd + resolvconf wrinkles Stefan Monnier <monnier@iro.umontreal.ca> - 2022-03-17 15:00 +0100
      Re: iwd + systemd-networkd + resolvconf wrinkles Brian <ad44@cityscape.co.uk> - 2022-03-17 16:00 +0100
      Re: iwd + systemd-networkd + resolvconf wrinkles David Wright <deblis@lionunicorn.co.uk> - 2022-03-18 06:00 +0100
        Re: iwd + systemd-networkd + resolvconf wrinkles Stefan Monnier <monnier@iro.umontreal.ca> - 2022-03-18 13:50 +0100
    Re: iwd + systemd-networkd + resolvconf wrinkles David Wright <deblis@lionunicorn.co.uk> - 2022-03-18 06:00 +0100
      Re: iwd + systemd-networkd + resolvconf wrinkles Brian <ad44@cityscape.co.uk> - 2022-03-18 15:50 +0100
        Re: iwd + systemd-networkd + resolvconf wrinkles Charlie <taoquester@gmail.com> - 2022-03-19 00:40 +0100
          wpa_supplicant, was Re: iwd + systemd-networkd + resolvconf wrinkles David Wright <deblis@lionunicorn.co.uk> - 2022-03-23 05:30 +0100
            Re: wpa_supplicant, was Re: iwd + systemd-networkd + resolvconf  wrinkles Brian <ad44@cityscape.co.uk> - 2022-03-23 19:30 +0100
            Re: wpa_supplicant, was Re: iwd + systemd-networkd + resolvconf  wrinkles Brian <ad44@cityscape.co.uk> - 2022-03-24 17:20 +0100
  Re: iwd + systemd-networkd + resolvconf wrinkles Brian <ad44@cityscape.co.uk> - 2022-03-17 16:10 +0100
    Re: iwd + systemd-networkd + resolvconf wrinkles David Wright <deblis@lionunicorn.co.uk> - 2022-03-18 06:00 +0100
      Re: iwd + systemd-networkd + resolvconf wrinkles Brian <ad44@cityscape.co.uk> - 2022-03-18 15:50 +0100
  Re: iwd + systemd-networkd + resolvconf wrinkles RP <reyadmin@gmail.com> - 2022-03-17 18:10 +0100
  Re: iwd + systemd-networkd + resolvconf wrinkles Brian <ad44@cityscape.co.uk> - 2022-03-18 22:20 +0100
    Re: iwd + systemd-networkd + resolvconf wrinkles Brian <ad44@cityscape.co.uk> - 2022-03-19 13:40 +0100
      Re: iwd + systemd-networkd + resolvconf wrinkles Nicholas Geovanis <nickgeovanis@gmail.com> - 2022-03-19 16:40 +0100
        Re: iwd + systemd-networkd + resolvconf wrinkles Brian <ad44@cityscape.co.uk> - 2022-03-21 14:20 +0100
    Re: iwd + systemd-networkd + resolvconf wrinkles David Wright <deblis@lionunicorn.co.uk> - 2022-03-19 16:40 +0100
      Re: iwd + systemd-networkd + resolvconf wrinkles Brian <ad44@cityscape.co.uk> - 2022-03-19 20:00 +0100
        Re: iwd + systemd-networkd + resolvconf wrinkles Stella Ashburne <rewefie@gmx.com> - 2022-03-23 13:30 +0100
          Re: iwd + systemd-networkd + resolvconf wrinkles David Wright <deblis@lionunicorn.co.uk> - 2022-03-23 16:40 +0100

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