[Bug 1586528] Re: Avahi-daemon withdraws address record

[Steve Chadsey]

This issue is not limited to Realtek as it occurs on my system with an
Intel ethernet controller (see
https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1586528/comments/9).

00:19.0 Ethernet controller: Intel Corporation Ethernet Connection (2) I218-V
	DeviceName:  Onboard LAN
	Subsystem: ASUSTeK Computer Inc. Ethernet Connection (2) I218-V
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 28
	Region 0: Memory at dfd00000 (32-bit, non-prefetchable) [size=128K]
	Region 1: Memory at dfd3c000 (32-bit, non-prefetchable) [size=4K]
	Region 2: I/O ports at f080 [size=32]
	Capabilities: <access denied>
	Kernel driver in use: e1000e
	Kernel modules: e1000e


I don't have a workaround but the following is what I use to help recover.  It pings my gateway periodically, and if it can't it attempts to restart networking.

In /etc/crontab:

# check networking
*/10 * * * *    root    /usr/local/bin/check_reset_network.sh >> /var/log/check_reset_network.log

/usr/local/bin/check_reset_network.sh:

---[start]-----
#!/bin/bash

echo "`date` $0 starting"

gw=192.168.1.254

echo "Trying to ping gw $gw"
out=$(ping -c 5 $gw 2>&1)

if [ $? -eq 0 ]; then
  echo "Success"
else
  echo "Failed to ping gw $gw"
  echo "Trying again in 20s"

  sleep 20

  out=$(ping -c 5 $gw 2>&1)

  if [ $? -ne 0 ]; then
    echo "Failed to ping gw $gw"
    echo "Restarting networking"

    sudo service network-manager restart

    echo "Waiting 20s to recheck network"
    sleep 20

    out=$(ping -c 5 $gw 2>&1)

    if [ $? -eq 0 ]; then
      echo "Success; sending mail"
      echo "Restarted networking" | mail your_email_addr
    else
      echo "Failed.  You're fucked."
    fi
  fi
fi

echo "Checking for default route"

out=$(/sbin/ip route | egrep '^default')
if [ $? -eq 0 ]; then
  echo "Success"
else
  echo "Failed to find default route.  Adding it."
  /sbin/route add default gw 192.168.1.254

  if [ $? -eq 0 ]; then
    echo "Success; sending mail"
    echo "Added default route" | mail your_email_addr
  else
      echo "Failed.  You're fucked."
  fi
fi

echo "`date` $0 done"
---[end]-----

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to avahi in Ubuntu.
https://bugs.launchpad.net/bugs/1586528

Title:
  Avahi-daemon withdraws address record

Status in avahi package in Ubuntu:
  Invalid
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