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<p>I am maintainer of Fedora dnsmasq package. I don't know about
any issue with latest dnsmasq on f36. It should work reliably.</p>
<p>I agree with Geert, log-queries option should reveal the most
details for troubleshooting. Default logging to journal should be
enough. Use "journalctl -xeu dnsmasq" command to see the most
recent output of dnsmasq.</p>
<p>You should see whether incoming query were received by the
dnsmasq. And where did it forwarded it. It should log also what
forwarder replied. If reply after forward is not logged but
wireshark can record such packets, it would mean some error in
socket handling code. But I think all known errors in Fedora 36
were fixed.</p>
<p>It is possible to send SIGHUP to dnsmasq to clear just cache.
Just use kill -SIGHUP $(pidof dnsmasq). But that should not be
necessary, especially not periodic way. Because systemd-resolved
is enabled by default on Fedora, are you sure you have disabled it
correctly? Are you connected by multiple interfaces at the same
time? Would it work with just one interface connected?</p>
<p>Lets find somehow a reason for your broken resolution instead of
dumping the cache periodically. While it should work even with
that, it definitely should not be required.</p>
<p>Cheers,<br>
Petr<br>
</p>
<div class="moz-cite-prefix">On 30. 06. 22 14:32, Tobias Hochgürtel
wrote:<br>
</div>
<blockquote type="cite"
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<p class="MsoPlainText"><span lang="EN-GB">On Wed, Jun 29, 2022
at 08:25:18PM +0000, Dominik Derigs wrote:<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"> * Tell us which
version of dnsmasq is being used<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"> * Reread the manual
page and in particular --log-queries option<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Andale
Mono"" lang="EN-GB">[root@router-fedora ~]#
<b>hostnamectl</b><o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Andale
Mono"" lang="EN-GB">Static hostname: router-fedora<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Andale
Mono"" lang="EN-GB"> Icon name: computer-desktop<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Andale
Mono"" lang="EN-GB"> Chassis: desktop
</span><span style="font-family:"Apple Color Emoji""
lang="EN-GB">🖥</span><span style="font-family:"Andale
Mono"" lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Andale
Mono"" lang="EN-GB"> Machine ID:
c9c0e33265b848bfbce224fd8615fb30<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Andale
Mono"" lang="EN-GB"> Boot ID:
0824361c352745c0a35a75167a2f81a0<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Andale
Mono"" lang="EN-GB">Operating System:
<b>Fedora Linux 36 (Server Edition)</b><o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Andale
Mono"" lang="EN-GB"> CPE OS Name:
cpe:/o:fedoraproject:fedora:36<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Andale
Mono"" lang="EN-GB"> Kernel:
<b>Linux 5.18.6-200.fc36.x86_64</b><o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Andale
Mono"" lang="EN-GB"> Architecture: x86-64<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Andale
Mono"" lang="EN-GB">Hardware Vendor: BIOSTAR Group<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Andale
Mono"" lang="EN-GB"> Hardware Model: N3150NH<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Andale
Mono"" lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="font-family:"Andale
Mono"" lang="EN-GB"><o:p> </o:p></span></p>
<p class="p1"><span
style="font-size:11.0pt;font-family:"Andale Mono""
lang="EN-GB">[root@router-fedora ~]#
<b>dnsmasq --version<o:p></o:p></b></span></p>
<p class="p1"><b><span
style="font-size:11.0pt;font-family:"Andale
Mono"" lang="EN-GB">Dnsmasq version 2.86</span></b><span
class="apple-converted-space"><span
style="font-size:11.0pt;font-family:"Andale
Mono"" lang="EN-GB">
</span></span><span
style="font-size:11.0pt;font-family:"Andale Mono""
lang="EN-GB">Copyright (c) 2000-2021 Simon Kelley<o:p></o:p></span></p>
<p class="p1"><span
style="font-size:11.0pt;font-family:"Andale Mono""
lang="EN-GB">Compile time options:
<b>IPv6 GNU-getopt DBus no-UBus no-i18n IDN2 DHCP DHCPv6
no-Lua TFTP conntrack ipset auth cryptohash DNSSEC
loop-detect inotify dumpfile<o:p></o:p></b></span></p>
<p class="p2"><span
style="font-size:11.0pt;font-family:"Andale Mono""
lang="EN-GB"><o:p> </o:p></span></p>
<p class="p1"><span
style="font-size:11.0pt;font-family:"Andale Mono""
lang="EN-GB">This software comes with ABSOLUTELY NO
WARRANTY.<o:p></o:p></span></p>
<p class="p1"><span
style="font-size:11.0pt;font-family:"Andale Mono""
lang="EN-GB">Dnsmasq is free software, and you are welcome
to redistribute it<o:p></o:p></span></p>
<p class="p1"><span
style="font-size:11.0pt;font-family:"Andale Mono""
lang="EN-GB">under the terms of the GNU General Public
License, version 2 or 3.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">From: Dnsmasq-discuss
<a class="moz-txt-link-rfc2396E" href="mailto:dnsmasq-discuss-bounces@lists.thekelleys.org.uk"><dnsmasq-discuss-bounces@lists.thekelleys.org.uk></a> on
behalf of Donald Muller <a class="moz-txt-link-rfc2396E" href="mailto:donmuller22@outlook.com"><donmuller22@outlook.com></a><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">Date: Thursday, 30.
June 2022 at 02:48<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">To: Geert Stappers
<a class="moz-txt-link-rfc2396E" href="mailto:stappers@stappers.nl"><stappers@stappers.nl></a>,
<a class="moz-txt-link-rfc2396E" href="mailto:dnsmasq-discuss@lists.thekelleys.org.uk">"dnsmasq-discuss@lists.thekelleys.org.uk"</a>
<a class="moz-txt-link-rfc2396E" href="mailto:dnsmasq-discuss@lists.thekelleys.org.uk"><dnsmasq-discuss@lists.thekelleys.org.uk></a><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">Subject: Re:
[Dnsmasq-discuss] Possible to reuse Cache over restats?<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">Also, what you are
running it on?<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">From: Dnsmasq-discuss
<a class="moz-txt-link-rfc2396E" href="mailto:dnsmasq-discuss-bounces@lists.thekelleys.org.uk"><dnsmasq-discuss-bounces@lists.thekelleys.org.uk></a> on
behalf of Geert Stappers via Dnsmasq-discuss
<a class="moz-txt-link-rfc2396E" href="mailto:dnsmasq-discuss@lists.thekelleys.org.uk"><dnsmasq-discuss@lists.thekelleys.org.uk></a><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">Sent: Wednesday, June
29, 2022 6:14:30 PM<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">To:
<a class="moz-txt-link-abbreviated" href="mailto:dnsmasq-discuss@lists.thekelleys.org.uk">dnsmasq-discuss@lists.thekelleys.org.uk</a>
<a class="moz-txt-link-rfc2396E" href="mailto:dnsmasq-discuss@lists.thekelleys.org.uk"><dnsmasq-discuss@lists.thekelleys.org.uk></a><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">Subject: Re:
[Dnsmasq-discuss] Possible to reuse Cache over restats?
<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">On Wed, Jun 29, 2022
at 08:25:18PM +0000, Dominik Derigs wrote:<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">> On Wed,
2022-06-29 at 18:37 +0000, Tobias Hochgürtel wrote:<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">> > There isn't
a feature to reuse the dns-cache?<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">> > or a plan
to add this feature?<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">> > <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">> There is no such
feature and there is also nothing planned at the moment<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">Oh, it was not a
joke.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">> However,
restarting dnsmasq once per hour surely is the least optimal<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">> solution to
circumvent what you are observing.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">So true.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">> On Wed,
2022-06-29 at 18:37 +0000, Tobias Hochgürtel wrote:<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">> > I also
don't know how I can analyse that behavior.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">> <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">> You could use
some widely known and used tools like Wireshark where
various<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">> tutorial are
available to see whether the issue is dnsmasq not responding<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">> or the queries
not making their way to dnsmasq or if something happens to<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">> the queries sent
upstream to the forward destionation, or whatever else may<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">> be happening. We
can surely give some assistance here, if you want.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">Here already some
assistance:<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">* Tell us which
version of dnsmasq is being used<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">* Reread the manual
page and in particular --log-queries option<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">Groeten<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">Geert Stappers<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">-- <o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">Silence is hard to
parse<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">_______________________________________________<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">Dnsmasq-discuss
mailing list<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><a class="moz-txt-link-abbreviated" href="mailto:Dnsmasq-discuss@lists.thekelleys.org.uk">Dnsmasq-discuss@lists.thekelleys.org.uk</a><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><a class="moz-txt-link-freetext" href="https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss">https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss</a><o:p></o:p></span></p>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
Dnsmasq-discuss mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Dnsmasq-discuss@lists.thekelleys.org.uk">Dnsmasq-discuss@lists.thekelleys.org.uk</a>
<a class="moz-txt-link-freetext" href="https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss">https://lists.thekelleys.org.uk/cgi-bin/mailman/listinfo/dnsmasq-discuss</a>
</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
Petr Menšík
Software Engineer, RHEL
Red Hat, <a class="moz-txt-link-freetext" href="http://www.redhat.com/">http://www.redhat.com/</a>
PGP: DFCF908DB7C87E8E529925BC4931CA5B6C9FC5CB</pre>
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