Dynamic DNS fails

[Volker Wysk]

Am Dienstag, den 23.03.2021, 16:31 +0000 schrieb Colin Law:
> On Tue, 23 Mar 2021 at 16:26, Volker Wysk <post at volker-wysk.de> wrote:
> > Am Dienstag, den 23.03.2021, 16:09 +0000 schrieb Colin Law:
> > > On Tue, 23 Mar 2021 at 16:02, Volker Wysk <post at volker-wysk.de> wrote:
> > > > Yes, this matches the behavior I've observed. When doing a "ping vwysk.now-
> > > > dns.net", first it takes a long time to respond (some five or ten seconds).
> > > > After that, doing it again, there is no noticeable delay. It stays like this
> > > > for another five or ten seconds, then it's back to the long delay again.
> > > Do you mean it takes five seconds to come back with the response
> > > PING vwysk.now-dns.net (IP) 56(84) bytes of data.
> > 
> > No, this is when it doesn't work. Then I get this: "vwysk.now-dns.net:
> > Temporärer Fehler bei der Namensauflösung". Translation: "temporary error on
> > name resolution".
> > 
> > When it works (like now), the delay is just noticeable (far less that a
> > second).
> 
> Try explicitly using 8.8.8.8 as the DNS server to see if it makes any
> difference.  That will tell you whether it is your DNS server that is
> the problem or your domain that is the problem.

You mean, when it fails again. And, let me guess, I should write the 8.8.8.8
in the "DNS" field in /etc/systemd/resolved.conf.

I observed this, the last time it didn't work: When I logged in to the shell
server of my web (and more) provider (in-berlin.de), and did the "ping
vwysk.now-dns.net" there, then IT WORKED. Even though it didn't work on my
home machine. 

To me, this looks like a strong hint that there's something wrong with
either my resolver, the name server in my router or the name server of my
internet provider.

Regards,
Volker
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