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Make sure you're not getting confused between "connection refused" and
a DNS reply with a REFUSED return code. The former means there's
nothing listening on port 53 at the address you're sending the query
to, which is possible if the bluetooth interface is new and network
manager hasn't prodded dnsmasq suitably. The later means the the query
is getting to dnsmasq and it's replying, which as you say, it only
does when it has no upstream servers. The log you posted doesn't seem
to show that dnsmasq has no servers, or that it's getting queries from
any address which could plausibly be a bluetooth device, so the
connection refused option looks quite likely, but it's important to
work which it is.



Cheers,

Simon.


On 26/01/17 17:26, Aaron Brice wrote:
> So, to summarize: after disconnecting and reconnecting the network 
> device, DNS queries are returning REFUSED, with no error messages 
> showing in the logs.  Is there any option to increase verbosity?  I
> read somewhere that the only reason dnsmasq returns REFUSED is if
> there are no nameservers or one of the nameservers returns REFUSED
> status. However there are several "using nameserver" entries in the
> logs, and no traffic occurs to those nameservers.
> 
> Thanks, Aaron
> 
> On 01/23/2017 02:47 PM, Aaron Brice wrote:
>> I am testing a bluetooth networking (bnep0) device on an Ubuntu
>> 16.04 laptop.  Everything works fine if I comment out dns=dnsmasq
>> from the NetworkManager.conf.  With dnsmasq on, everything works
>> fine the first time I connect my bluetooth network device.  When
>> I disconnect it and reconnect it, DNS lookups fail immediately
>> with a REFUSED status. When I restart the NetworkManager service
>> everything works again.
>> 
>> I turned on log-queries, and it shows the query is received, but
>> no response is shown in the logs and also no error messages.  The
>> logs show that on the reconnect the DHCP succeeded, and dnsmasq
>> received the upstream nameservers from the DHCP response, but
>> tcpdump does not show any DNS traffic to those nameservers when I
>> use dig.  Is there a verbosity setting that might show some more
>> information on why the DNS queries are being refused?
>> 
>> Logs:
>> 
>> Jan 18 16:56:02 datasoft-travel dnsmasq[7973]: setting upstream 
>> servers from DBus Jan 18 16:56:02 datasoft-travel dnsmasq[7973]:
>> using nameserver 192.168.10.2#53(via bnep0) Jan 18 16:56:02
>> datasoft-travel dnsmasq[7973]: using nameserver 
>> 68.105.29.16#53(via bnep0) Jan 18 16:56:02 datasoft-travel
>> dnsmasq[7973]: using nameserver 68.105.28.16#53(via bnep0) Jan 18
>> 16:56:02 datasoft-travel dnsmasq[7973]: query[A] daisy.ubuntu.com
>> from 127.0.0.1 Jan 18 16:56:02 datasoft-travel whoopsie[883]:
>> [16:56:02] Cannot reach: https://daisy.ubuntu.com Jan 18 16:56:02
>> datasoft-travel dnsmasq[7973]: query[SOA] local from 127.0.0.1 
>> Jan 18 16:56:02 datasoft-travel NetworkManager[7926]: <info> 
>> [1484783762.2180] device (5C:31:3E:EC:71:B3): Activation:
>> successful, device activated. Jan 18 16:56:02 datasoft-travel
>> nm-dispatcher: req:2 'up' [bnep0]: new request (1 scripts) Jan 18
>> 16:56:02 datasoft-travel nm-dispatcher: req:2 'up' [bnep0]: start
>> running ordered scripts... Jan 18 16:56:02 datasoft-travel
>> whoopsie[883]: [16:56:02] The default IPv4 route is:
>> /org/freedesktop/NetworkManager/ActiveConnection/2 Jan 18
>> 16:56:02 datasoft-travel deja-dup-monito[3334]: Source ID 948 was
>> not found when attempting to remove it Jan 18 16:56:02
>> datasoft-travel whoopsie[883]: [16:56:02] Network connection may
>> be a paid data plan: /org/freedesktop/NetworkManager/Devices/3 
>> Jan 18 16:56:02 datasoft-travel dnsmasq[7973]: query[A] 
>> daisy.ubuntu.com from 127.0.0.1 Jan 18 16:56:02 datasoft-travel
>> whoopsie[883]: [16:56:02] Cannot reach: https://daisy.ubuntu.com 
>> Jan 18 16:56:02 datasoft-travel dnsmasq[7973]: query[SOA] local
>> from 127.0.0.1 Jan 18 16:56:02 datasoft-travel systemd[1]:
>> Reloading. Jan 18 16:56:02 datasoft-travel systemd[1]:
>> snapd.refresh.timer: Adding 4h 43min 19.514615s random time. Jan
>> 18 16:56:02 datasoft-travel systemd[1]: apt-daily.timer: Adding
>> 2h 3min 35.943181s random time. Jan 18 16:56:02 datasoft-travel
>> dnsmasq[7973]: query[SOA] local from 127.0.0.1 Jan 18 16:56:02
>> datasoft-travel systemd[1]: Reloading. Jan 18 16:56:02
>> datasoft-travel systemd[1]: snapd.refresh.timer: Adding 1h 9min
>> 9.603579s random time. Jan 18 16:56:02 datasoft-travel
>> systemd[1]: apt-daily.timer: Adding 6h 19min 48.788489s random
>> time. Jan 18 16:56:03 datasoft-travel dnsmasq[7973]: query[A] 
>> fsodqcsvqrxnlyy.corp.datasoft.com from 127.0.0.1 Jan 18 16:56:03
>> datasoft-travel dnsmasq[7973]: query[A] xasqjyv.corp.datasoft.com
>> from 127.0.0.1 Jan 18 16:56:03 datasoft-travel dnsmasq[7973]:
>> query[A] ftmkaipfpi.corp.datasoft.com from 127.0.0.1 Jan 18
>> 16:56:03 datasoft-travel dnsmasq[7973]: query[A] daisy.ubuntu.com
>> from 127.0.0.1 Jan 18 16:56:03 datasoft-travel whoopsie[883]:
>> [16:56:03] Cannot reach: https://daisy.ubuntu.com Jan 18 16:56:03
>> datasoft-travel avahi-daemon[903]: Joining mDNS multicast group
>> on interface bnep0.IPv6 with address fe80::cf57:5122:c1f0:43cd. 
>> Jan 18 16:56:03 datasoft-travel avahi-daemon[903]: New relevant 
>> interface bnep0.IPv6 for mDNS. Jan 18 16:56:03 datasoft-travel
>> avahi-daemon[903]: Registering new address record for
>> fe80::cf57:5122:c1f0:43cd on bnep0.*. Jan 18 16:56:03
>> datasoft-travel dnsmasq[7973]: query[A] daisy.ubuntu.com from
>> 127.0.0.1 Jan 18 16:56:03 datasoft-travel whoopsie[883]:
>> [16:56:03] Cannot reach: https://daisy.ubuntu.com Jan 18 16:56:03
>> datasoft-travel NetworkManager[7926]: <info> [1484783763.4104]
>> policy: set 'SIDEBRIDGE_002020 Network' (bnep0) as default for
>> IPv6 routing and DNS Jan 18 16:56:03 datasoft-travel
>> dnsmasq[7973]: query[A] daisy.ubuntu.com from 127.0.0.1 Jan 18
>> 16:56:03 datasoft-travel whoopsie[883]: [16:56:03] Cannot reach:
>> https://daisy.ubuntu.com Jan 18 16:56:04 datasoft-travel
>> dnsmasq[7973]: query[A] hmtddsov.corp.datasoft.com from
>> 127.0.0.1 Jan 18 16:56:04 datasoft-travel dnsmasq[7973]:
>> query[A] bigsooxchvptr.corp.datasoft.com from 127.0.0.1 Jan 18
>> 16:56:04 datasoft-travel dnsmasq[7973]: query[A] 
>> ecbamrdeizxzc.corp.datasoft.com from 127.0.0.1 Jan 18 16:56:04
>> datasoft-travel dnsmasq[7973]: query[A] daisy.ubuntu.com from
>> 127.0.0.1 Jan 18 16:56:04 datasoft-travel whoopsie[883]:
>> [16:56:04] Cannot reach: https://daisy.ubuntu.com Jan 18 16:56:04
>> datasoft-travel ModemManager[898]: <info> Couldn't check support
>> for device at '/sys/devices/pci0000:00/0000:00:14.0/usb1/1-5':
>> not supported by any plugin Jan 18 16:56:05 datasoft-travel
>> dnsmasq[7973]: query[A] www.google.com from 127.0.0.1 Jan 18
>> 16:56:06 datasoft-travel dnsmasq[7973]: query[A] www.google.com 
>> from 127.0.0.1 Jan 18 16:56:07 datasoft-travel dnsmasq[7973]:
>> query[A] www.cnn.com from 127.0.0.1
>> 
>> Thanks, Aaron
>> 
>> 
>> _______________________________________________ Dnsmasq-discuss
>> mailing list Dnsmasq-discuss@lists.thekelleys.org.uk 
>> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
>> 
>> 
> 
> 
> _______________________________________________ Dnsmasq-discuss
> mailing list Dnsmasq-discuss@lists.thekelleys.org.uk 
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> 
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