This possibly arises from bug #1003842.
What is possibly happening: the second or third nameserver on the list
of available nameservers supplied to dnsmasq replies quickly to
dnsmasq's query with a negative answer and dnsmasq immediately passes
that negative answer back to the resolver.
When dnsmasq is not used, the resolver tries the first nameserver on the
list first, only trying the second nameserver after a timeout period.
If this is the problem then the "correct" solution is to fix the
malfunctioning nameserver or to remove it from the list.
** Changed in: dnsmasq (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1522057
Title:
DNS resolution stops working after some time
Status in dnsmasq package in Ubuntu:
Incomplete
Status in network-manager package in Ubuntu:
Confirmed
Bug description:
DNS resolution stops working after sometime (usually 10-20 minutes) in
Lubuntu 15.10
The problem can be temporarily corrected after restarting network-
manager using systemctl, but it starts again after 10-20 minutes.
Looks like network-manager is not configuring dnsmasq properly.
Output from 'nslookup google.com':
~~~~~
Server: 127.0.1.1
Address: 127.0.1.1#53
** server can't find google.com: REFUSED
~~~~~
Output from 'tcpdump -i lo port 53' while running above command:
~~~~~
20:16:59.235879 IP localhost.38045 > comp0.arhome.info.domain: 28529+ A?
google.com. (28)
20:16:59.286851 IP comp0.arhome.info.domain > localhost.38045: 28529 Refused
0/0/0 (28)
~~~~~
ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: network-manager 1.0.4-0ubuntu5.1
ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
Uname: Linux 4.2.0-18-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CRDA:
country IN: DFS-JP
(2402 - 2482 @ 40), (N/A, 20), (N/A)
(5170 - 5250 @ 80), (N/A, 20), (N/A)
(5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS
(5735 - 5835 @ 80), (N/A, 20), (N/A)
CurrentDesktop: LXDE
Date: Wed Dec 2 20:14:32 2015
IfupdownConfig:
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
InstallationDate: Installed on 2015-09-25 (68 days ago)
InstallationMedia: Lubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
IpRoute:
default via 172.16.84.1 dev wlan0 proto static metric 600
172.16.84.0/22 dev wlan0 proto kernel scope link src 172.16.84.50 metric
600
200.1.1.2 via 172.16.84.1 dev wlan0 proto dhcp metric 600
NetworkManager.state:
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true
SourcePackage: network-manager
UpgradeStatus: Upgraded to wily on 2015-11-06 (25 days ago)
nmcli-dev:
DEVICE TYPE STATE DBUS-PATH
CONNECTION CON-UUID CON-PATH
wlan0 wifi connected /org/freedesktop/NetworkManager/Devices/1
nn0.arhome.info bab29dc2-8a79-4170-8253-277286712124
/org/freedesktop/NetworkManager/ActiveConnection/0
eth0 ethernet unavailable /org/freedesktop/NetworkManager/Devices/2
-- -- --
vboxnet0 ethernet unmanaged /org/freedesktop/NetworkManager/Devices/3
-- -- --
lo loopback unmanaged /org/freedesktop/NetworkManager/Devices/0
-- -- --
nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code
2: Error: Object 'nm' is unknown, try 'nmcli help'.
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