[Dnsmasq-discuss] Avoid conflicts between dnsmasq and systemd-resolved.

Hongyi Zhao hongyi.zhao at gmail.com
Wed Sep 16 09:32:10 BST 2020


On Wed, Sep 16, 2020 at 2:03 PM Geert Stappers <stappers at stappers.nl> wrote:
>
> On Wed, Sep 16, 2020 at 01:19:27PM +0800, Hongyi Zhao wrote:
> > On Wed, Sep 16, 2020 at 11:18 AM Dominick C. Pastore wrote:
>       ...
> > >
> > > This does indeed seem strange. Unfortunately, I'm not sure either. The
> > > best I can suggest is to check the syslog for any clues, if you
> > > haven't yet.
> >
> > If I’ve time later this afternoon, I will check it and feedback.
>
> Please do

I tried with the following steps but still can't find out any valuable
information for the syslog:

$ dig @127.0.0.1 www.baidu.com ANY
$ grep www.baidu.com  /var/log/syslog
$ tail -100 /var/log/syslog
Sep 16 16:29:28 ubuntu-01 kernel: [ 7365.343806] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:28 ubuntu-01 kernel: [ 7365.343811] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:29 ubuntu-01 kernel: [ 7365.962314] pcieport
0000:00:1c.0: AER: Multiple Corrected error received: 0000:00:1c.0
Sep 16 16:29:29 ubuntu-01 kernel: [ 7365.962330] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:29 ubuntu-01 kernel: [ 7365.962339] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:29 ubuntu-01 kernel: [ 7365.962346] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:29 ubuntu-01 kernel: [ 7365.977551] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:29 ubuntu-01 kernel: [ 7365.977567] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:29 ubuntu-01 kernel: [ 7365.977575] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:29 ubuntu-01 kernel: [ 7365.977580] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:29 ubuntu-01 kernel: [ 7366.177188] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:29 ubuntu-01 kernel: [ 7366.177203] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:29 ubuntu-01 kernel: [ 7366.177211] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:29 ubuntu-01 kernel: [ 7366.177216] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:30 ubuntu-01 kernel: [ 7366.828912] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:30 ubuntu-01 kernel: [ 7366.828933] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:30 ubuntu-01 kernel: [ 7366.828941] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:30 ubuntu-01 kernel: [ 7366.828946] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:31 ubuntu-01 kernel: [ 7367.678465] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:31 ubuntu-01 kernel: [ 7367.678480] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:31 ubuntu-01 kernel: [ 7367.678487] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:31 ubuntu-01 kernel: [ 7367.678492] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:31 ubuntu-01 kernel: [ 7367.699104] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:31 ubuntu-01 kernel: [ 7367.699114] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:31 ubuntu-01 kernel: [ 7367.699121] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:31 ubuntu-01 kernel: [ 7367.699127] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:31 ubuntu-01 kernel: [ 7367.710196] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:31 ubuntu-01 kernel: [ 7367.710211] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:31 ubuntu-01 kernel: [ 7367.710219] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:31 ubuntu-01 kernel: [ 7367.710224] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:31 ubuntu-01 kernel: [ 7367.866300] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:31 ubuntu-01 kernel: [ 7367.866315] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:31 ubuntu-01 kernel: [ 7367.866322] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:31 ubuntu-01 kernel: [ 7367.866326] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:31 ubuntu-01 kernel: [ 7368.243076] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:31 ubuntu-01 kernel: [ 7368.243092] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:31 ubuntu-01 kernel: [ 7368.243100] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:31 ubuntu-01 kernel: [ 7368.243105] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:33 ubuntu-01 kernel: [ 7370.434195] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:33 ubuntu-01 kernel: [ 7370.434210] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:33 ubuntu-01 kernel: [ 7370.434217] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:33 ubuntu-01 kernel: [ 7370.434222] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:34 ubuntu-01 kernel: [ 7370.646059] pcieport
0000:00:1c.0: AER: Multiple Corrected error received: 0000:00:1c.0
Sep 16 16:29:34 ubuntu-01 kernel: [ 7370.646073] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:34 ubuntu-01 kernel: [ 7370.646081] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:34 ubuntu-01 kernel: [ 7370.646086] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:35 ubuntu-01 kernel: [ 7371.701321] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:35 ubuntu-01 kernel: [ 7371.701336] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:35 ubuntu-01 kernel: [ 7371.701345] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:35 ubuntu-01 kernel: [ 7371.701350] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:37 ubuntu-01 kernel: [ 7373.716810] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:37 ubuntu-01 kernel: [ 7373.716826] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:37 ubuntu-01 kernel: [ 7373.716834] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:37 ubuntu-01 kernel: [ 7373.716839] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:37 ubuntu-01 kernel: [ 7373.836756] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:37 ubuntu-01 kernel: [ 7373.836767] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:37 ubuntu-01 kernel: [ 7373.836775] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:37 ubuntu-01 kernel: [ 7373.836780] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:39 ubuntu-01 kernel: [ 7375.845508] pcieport
0000:00:1c.0: AER: Multiple Corrected error received: 0000:00:1c.0
Sep 16 16:29:39 ubuntu-01 kernel: [ 7375.845566] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:39 ubuntu-01 kernel: [ 7375.845574] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:39 ubuntu-01 kernel: [ 7375.845579] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:40 ubuntu-01 kernel: [ 7376.792111] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:40 ubuntu-01 kernel: [ 7376.792121] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:40 ubuntu-01 kernel: [ 7376.792128] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:40 ubuntu-01 kernel: [ 7376.792133] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:40 ubuntu-01 kernel: [ 7377.011045] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:40 ubuntu-01 kernel: [ 7377.011056] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:40 ubuntu-01 kernel: [ 7377.011065] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:40 ubuntu-01 kernel: [ 7377.011071] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:40 ubuntu-01 kernel: [ 7377.415907] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:40 ubuntu-01 kernel: [ 7377.415923] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:40 ubuntu-01 kernel: [ 7377.415931] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:40 ubuntu-01 kernel: [ 7377.415936] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:41 ubuntu-01 kernel: [ 7378.010192] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:41 ubuntu-01 kernel: [ 7378.010208] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:41 ubuntu-01 kernel: [ 7378.010215] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:41 ubuntu-01 kernel: [ 7378.010221] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:41 ubuntu-01 kernel: [ 7378.470410] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:41 ubuntu-01 kernel: [ 7378.470426] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:41 ubuntu-01 kernel: [ 7378.470434] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:41 ubuntu-01 kernel: [ 7378.470439] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:41 ubuntu-01 kernel: [ 7378.470456] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:41 ubuntu-01 kernel: [ 7378.470503] pcieport
0000:00:1c.0: AER: can't find device of ID00e0
Sep 16 16:29:43 ubuntu-01 kernel: [ 7380.273057] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:43 ubuntu-01 kernel: [ 7380.273067] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:43 ubuntu-01 kernel: [ 7380.273075] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:43 ubuntu-01 kernel: [ 7380.273081] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:43 ubuntu-01 kernel: [ 7380.438025] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:43 ubuntu-01 kernel: [ 7380.438041] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:43 ubuntu-01 kernel: [ 7380.438048] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:43 ubuntu-01 kernel: [ 7380.438054] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:45 ubuntu-01 kernel: [ 7382.078526] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:45 ubuntu-01 kernel: [ 7382.078542] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:45 ubuntu-01 kernel: [ 7382.078552] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:45 ubuntu-01 kernel: [ 7382.078558] pcieport
0000:00:1c.0: AER:    [12] Timeout
Sep 16 16:29:46 ubuntu-01 kernel: [ 7382.759819] pcieport
0000:00:1c.0: AER: Corrected error received: 0000:00:1c.0
Sep 16 16:29:46 ubuntu-01 kernel: [ 7382.759835] pcieport
0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link
Layer, (Transmitter ID)
Sep 16 16:29:46 ubuntu-01 kernel: [ 7382.759843] pcieport
0000:00:1c.0: AER:   device [8086:a115] error
status/mask=00001000/00002000
Sep 16 16:29:46 ubuntu-01 kernel: [ 7382.759849] pcieport
0000:00:1c.0: AER:    [12] Timeout


>
>
>        ...
> > > I was a little surprised this one worked since the previous one
> > > didn't, but I suspect systemd-resolved is falling back to the
> > > FallbackDNS servers (which are hardcoded in if not set explicitly).
>
> > What's the FallbackDNS servers and how can I find/list them?
>
> Good question.  The "hardcoded" suggest it is in source code.
>
>
> Regards
> Geert Stappers
> --
> Silence is hard to parse
>
> _______________________________________________
> Dnsmasq-discuss mailing list
> Dnsmasq-discuss at lists.thekelleys.org.uk
> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss



-- 
Hongyi Zhao <hongyi.zhao at gmail.com>



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