Public bug reported:

Sometimes, dns lookups via local bridge and local pdnsd take a long
time. Additionally, pinging a KVM machine attached via tap device to the
local bridge gives a "network unreachable" error because arp requests
don't get propagated to the VM. After some time and/or tcpdump starts
the problem goes away without any further modifications/help.

A downgrade to kernel 3.0.22 helps.

Kernels 3.1.x and 3.2.x seem to be a mess. Going live with them for the
next five years, seems rather questionable.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image (not installed)
ProcVersionSignature: Ubuntu 3.2.0-17.27-generic 3.2.6
Uname: Linux 3.2.0-17-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.93-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
 BEN.        PID ZUGR.  BEFEHL
 /dev/snd/controlC1:  mark       3801 F.... pulseaudio
 /dev/snd/pcmC1D7p:   mark       3801 F...m pulseaudio
 /dev/snd/controlC0:  mark       3801 F.... pulseaudio
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not 
found.
Card0.Amixer.info:
 Card hw:0 'CA0106'/'Audigy SE [SB0570] at 0xce00 irq 16'
   Mixer name   : 'CA0106'
   Components   : ''
   Controls      : 35
   Simple ctrls  : 18
Card1.Amixer.info:
 Card hw:1 'NVidia'/'HDA NVidia at 0xfaffc000 irq 17'
   Mixer name   : 'Nvidia GPU 0d HDMI/DP'
   Components   : 'HDA:10de000d,10de0101,00100100'
   Controls      : 24
   Simple ctrls  : 4
CurrentDmesg:
 Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg 
-'] failed with exit code 1: comm: /var/log/dmesg: Keine Berechtigung
 dmesg: write failed: Datenübergabe unterbrochen (broken pipe)
Date: Sat Feb 25 19:55:04 2012
EcryptfsInUse: Yes
MachineType: Gigabyte Technology Co., Ltd. P55-USB3
ProcEnviron:
 TERM=xterm
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=de_DE.UTF-8
 LANGUAGE=de:en
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-17-generic 
root=/dev/mapper/hostnamevg-hostnameroot ro crashkernel=384M-2G:64M,2G-:128M 
ipv6.disable=1 ip=dhcp ISCSI_INITIATOR=iqn.1993-08.org.debian:01:95384da15332 
ISCSI_TARGET_NAME=iqn.mstier.de:desktop64.img ISCSI_TARGET_IP=192.168.0.4 
ISCSI_TARGET_PORT=3260
RfKill:

SourcePackage: linux
UpgradeStatus: Upgraded to precise on 2012-02-12 (13 days ago)
WifiSyslog:

dmi.bios.date: 02/11/2010
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F4
dmi.board.name: P55-USB3
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: 
dmi:bvnAwardSoftwareInternational,Inc.:bvrF4:bd02/11/2010:svnGigabyteTechnologyCo.,Ltd.:pnP55-USB3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnP55-USB3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: P55-USB3
dmi.sys.vendor: Gigabyte Technology Co., Ltd.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise

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https://bugs.launchpad.net/bugs/941059

Title:
  sporadic network packet delays/nontransmissions

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