The failure had not recurred until today. My slightly amended version
of the script provided above by Steve Chadsey (schadsey), 2017-07-19,
https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1586528/comments/18
did not rectify the problem. I have since modified it more and hope
that it can provide useful diagnostics next time there is a similar
failure.
The connection was active until after 00:49:01. It was restored
manually by 08:11:59. Unfortunately, I cannot be certain whether I
reactivated the interface or whether an automated script did so.
yoyo ~ # ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:25:64:72:72:14
inet6 addr: fe80::c1e6:4b25:5c64:f669/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:65340342 errors:0 dropped:0 overruns:0 frame:0
TX packets:26833432 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:21650436815 (21.6 GB) TX bytes:140523812727 (140.5 GB)
Interrupt:18
yoyo ~ # ifconfig eth0 down
yoyo ~ # ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:25:64:72:72:14
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:65340378 errors:0 dropped:0 overruns:0 frame:0
---------------------^^^^^^^^------------------^
TX packets:26833625 errors:0 dropped:0 overruns:0 carrier:0
---------------------^^^^^^^^------------------^
collisions:0 txqueuelen:1000
RX bytes:21650441164 (21.6 GB) TX bytes:140523828704 (140.5 GB)
-------------------^^^^^^^^^^^---------------------^^^^^^^^^^^^
Interrupt:18
Notice that the counts of packets and bytes had been increasing, and
that no packets had been dropped.
yoyo ~ # ip a add 192.168.42.187 dev eth0
yoyo ~ # ip a s eth0
2: eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN group
default qlen 1000
link/ether 00:25:64:72:72:14 brd ff:ff:ff:ff:ff:ff
inet 192.168.42.187/32 scope global eth0
valid_lft forever preferred_lft forever
yoyo ~ # ip a del 192.168.42.187 dev eth0
Warning: Executing wildcard deletion to stay compatible with old scripts.
Explicitly specify the prefix length (192.168.42.187/32) to avoid
this warning.
This special behaviour is likely to disappear in further releases,
fix your scripts!
yoyo ~ # ip a s eth0
2: eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN group
default qlen 1000
link/ether 00:25:64:72:72:14 brd ff:ff:ff:ff:ff:ff
yoyo ~ # ip a add 192.168.42.187/24 dev eth0
yoyo ~ # ip a s eth0
2: eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN group
default qlen 1000
link/ether 00:25:64:72:72:14 brd ff:ff:ff:ff:ff:ff
inet 192.168.42.187/24 scope global eth0
valid_lft forever preferred_lft forever
yoyo ~ # ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:25:64:72:72:14
inet addr:192.168.42.187 Bcast:0.0.0.0 Mask:255.255.255.0yoyo ~ #
ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:25:64:72:72:14
inet addr:192.168.42.187 Bcast:0.0.0.0 Mask:255.255.255.0
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:65340544 errors:0 dropped:357 overruns:0 frame:0
-----------------------------------------------^^^
TX packets:26834217 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:21650460079 (21.6 GB) TX bytes:140523878283 (140.5 GB)
Interrupt:18
Now there are dropped packets.
yoyo ~ # ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:25:64:72:72:14
inet addr:192.168.42.187 Bcast:0.0.0.0 Mask:255.255.255.0
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:65340544 errors:0 dropped:638 overruns:0 frame:0
-----------------------------------------------^^^
TX packets:26834217 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:21650460079 (21.6 GB) TX bytes:140523878283 (140.5 GB)
Interrupt:18
More packets have been dropped.
yoyo ~ # ifconfig eth0 down
yoyo ~ # ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:25:64:72:72:14
inet addr:192.168.42.187 Bcast:0.0.0.0 Mask:255.255.255.0
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:65340544 errors:0 dropped:687 overruns:0 frame:0
TX packets:26834217 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:21650460079 (21.6 GB) TX bytes:140523878283 (140.5 GB)
Interrupt:18
Oops. My memory let me down:-
yoyo ~ # ifconfig eth0 up dhcp
dhcp: Unknown host
ifconfig: `--help' gives usage information.
yoyo ~ # ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:25:64:72:72:14
inet addr:192.168.42.187 Bcast:0.0.0.0 Mask:255.255.255.0
inet6 addr: fe80::225:64ff:fe72:7214/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
!---------^^
RX packets:65340857 errors:0 dropped:697 overruns:0 frame:0
TX packets:26834733 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:21650604853 (21.6 GB) TX bytes:140523968671 (140.5 GB)
Interrupt:18
One surprising discovery was that a virtual machine maintained its connection
through the same interface that the physical host had lost. Also, the network
manager icon was missing from the task bar (though it may have gone because of
my actions).
On the physical host, the D.H.C.P. daemon "dhclient" had terminated.
Its last known activity was at 01:18:47.
[LinuxMint] graham@yoyo $ grep "dhclient" /var/log/daemon.log | tail -n 4
Sep 1 01:17:08 yoyo dhclient[20006]: DHCPREQUEST of 192.168.42.187 on eth0 to
255.255.255.255 port 67 (xid=0x458de0a7)
Sep 1 01:18:02 yoyo dhclient[20006]: message repeated 4 times: [ DHCPREQUEST
of 192.168.42.187 on eth0 to 255.255.255.255 port 67 (xid=0x458de0a7)]
Sep 1 01:18:23 yoyo dhclient[20006]: DHCPREQUEST of 192.168.42.187 on eth0 to
255.255.255.255 port 67 (xid=0x458de0a7)
Sep 1 01:18:47 yoyo dhclient[20006]: message repeated 2 times: [ DHCPREQUEST
of 192.168.42.187 on eth0 to 255.255.255.255 port 67 (xid=0x458de0a7)]
Fri Sep 01 12:33:22 ~
Here is an except from /var/log/daemon.log showing activities of avahi-daemon:
Sep 1 00:48:54 yoyo dhclient[20006]: DHCPACK of 192.168.42.187 from
192.168.42.129
Sep 1 00:48:54 yoyo dhclient[20006]: bound to 192.168.42.187 -- renewal in 708
seconds.
Sep 1 00:53:07 yoyo avahi-daemon[1017]: Withdrawing address record for
192.168.42.187 on eth0.
Sep 1 00:53:07 yoyo avahi-daemon[1017]: Leaving mDNS multicast group on
interface eth0.IPv4 with address 192.168.42.187.
Sep 1 00:53:07 yoyo avahi-daemon[1017]: Interface eth0.IPv4 no longer relevant
for mDNS.
Sep 1 00:53:09 yoyo ntpd[20331]: Deleting interface #3 eth0,
192.168.42.187#123, interface stats: received=11901, sent=12617, dropped=0,
active_time=611380 secs
Sep 1 00:53:09 yoyo ntpd[20331]: 85.199.214.102 local addr 192.168.42.187 ->
<null>
...
Sep 1 08:11:36 yoyo ntpd[2507]: error resolving pool 0.ubuntu.pool.ntp.org:
Temporary failure in name resolution (-3)
Sep 1 08:11:59 yoyo avahi-daemon[1017]: Joining mDNS multicast group on
interface eth0.IPv4 with address 192.168.42.187.
Sep 1 08:11:59 yoyo avahi-daemon[1017]: New relevant interface eth0.IPv4 for
mDNS.
Sep 1 08:11:59 yoyo avahi-daemon[1017]: Registering new address record for
192.168.42.187 on eth0.IPv4.
Sep 1 08:12:02 yoyo systemd[1]: Started Network Manager.
--
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1586528
Title:
Avahi-daemon withdraws address record
Status in avahi package in Ubuntu:
New
Status in network-manager package in Ubuntu:
Confirmed
Bug description:
For some reason, if I leave my Ubuntu VM up for a prolonged period of
time the machine will lose connection to the network. ip addr shows
that the nic port no longer has an address and an examination of the
syslog shows this:
May 27 14:19:38 matt-VirtualBox avahi-daemon[590]: Withdrawing address record
for 10.0.2.15 on enp0s3.
May 27 14:19:38 matt-VirtualBox avahi-daemon[590]: Leaving mDNS multicast
group on interface enp0s3.IPv4 with address 10.0.2.15.
May 27 14:19:38 matt-VirtualBox avahi-daemon[590]: Interface enp0s3.IPv4 no
longer relevant for mDNS.
for no known reason.
The only reliable way to get the network to come back (that I have
found) is a full reboot.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: avahi-daemon 0.6.32~rc+dfsg-1ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Fri May 27 15:11:34 2016
InstallationDate: Installed on 2015-10-22 (218 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: avahi
UpgradeStatus: Upgraded to xenial on 2016-03-30 (58 days ago)
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1586528/+subscriptions
--
Mailing list: https://launchpad.net/~touch-packages
Post to : touch-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~touch-packages
More help : https://help.launchpad.net/ListHelp
