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<p><font face="Verdana">Hi Jason,</font></p>
<p><font face="Verdana">Thanks for the very quick response.</font></p>
<p><font face="Verdana">It happens with both the August and September
snapshots. Kernel 4.9.35+, Raspbian based on Debian 9 and
nothing odd in dmesg.</font></p>
<p><font face="Verdana">However, your comment about network
management daemons running is most interesting. Here's an
extract from journalctl's output:</font></p>
<blockquote>
<p><font face="Verdana">Sep 09 21:31:28 janus ifplugd(wg0)[6903]:
ifplugd 0.28 initializing.<br>
Sep 09 21:31:28 janus ifplugd(wg0)[6903]: Using interface
wg0/00:00:00:00:00:00<br>
Sep 09 21:31:28 janus ifplugd(wg0)[6903]: Using detection
mode: IFF_RUNNING<br>
Sep 09 21:31:28 janus ifplugd(wg0)[6903]: Initialization
complete, link beat detected.<br>
Sep 09 21:31:28 janus ifplugd(wg0)[6903]: Executing
'/etc/ifplugd/ifplugd.action wg0 up'.<br>
Sep 09 21:31:28 janus ifplugd(wg0)[6903]: client: Ignoring
unknown interface wg0=wg0.<br>
Sep 09 21:31:29 janus ifplugd(wg0)[6903]: Program executed
successfully.<br>
</font></p>
</blockquote>
<p><font face="Verdana">So, something is triggering ifplug. I'm
unsure what it might be doing and it <i>seems</i> to imply that
it's ignoring it but maybe this is the cause of the problem. wg0
is <i>not</i> mentioned in /etc/network/interfaces so maybe
ifup is trying to be helpful? There may well be a race condition
between ifup and wg-quick…</font></p>
<p><font face="Verdana">Regards,</font></p>
<p><font face="Verdana">Jim.<br>
</font></p>
<p><font face="Verdana"></font><br>
</p>
<br>
<div class="moz-cite-prefix">On 10/09/17 13:44, Jason A. Donenfeld
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAHmME9ptrCHRbAXpztbveMrHZ-nSOwadgX0vfnmDgKrGE_ge7g@mail.gmail.com">
<pre wrap="">Hey Jim,
That's very odd indeed. Do you have any other network management
daemons running on there that could be interfering?
Also: what snapshot version, kernel version, distribution, etc are you
using? Anything odd in dmesg after running wg-quick?
Regards,
Jason
</pre>
</blockquote>
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