[Bug 616064] Re: Broken networking in kvm guests

[Anthony O.]

1.
$ virsh dumpxml vs-maven
<domain type='kvm' id='4'>
  <name>vs-maven</name>
  <uuid>40f97e28-afc2-1730-3dfb-292074bae1d6</uuid>
  <memory>2097152</memory>
  <currentMemory>2097152</currentMemory>
  <vcpu>1</vcpu>
  <os>
    <type arch='x86_64' machine='pc-0.12'>hvm</type>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/bin/kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/var/lib/libvirt/images/vs-maven.img'/>
      <target dev='vda' bus='virtio'/>
    </disk>
    <disk type='block' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <target dev='hdc' bus='ide'/>
      <readonly/>
    </disk>
    <interface type='bridge'>
      <mac address='52:54:00:0f:30:ea'/>
      <source bridge='br0'/>
      <target dev='vnet3'/>
      <model type='virtio'/>
    </interface>
    <console type='pty' tty='/dev/pts/3'>
      <source path='/dev/pts/3'/>
      <target port='0'/>
    </console>
    <console type='pty' tty='/dev/pts/3'>
      <source path='/dev/pts/3'/>
      <target port='0'/>
    </console>
    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='5903' autoport='yes' keymap='fr'/>
    <video>
      <model type='cirrus' vram='9216' heads='1'/>
    </video>
  </devices>
  <seclabel type='dynamic' model='apparmor'>
    <label>libvirt-40f97e28-afc2-1730-3dfb-292074bae1d6</label>
    <imagelabel>libvirt-40f97e28-afc2-1730-3dfb-292074bae1d6</imagelabel>
  </seclabel>
</domain>

2. Server :
admin at vs-master:~$ lsb_release -rd
Description:	Ubuntu 10.04.3 LTS
Release:	10.04
admin at vs-master:~$ uname -a
Linux vs-master 2.6.32-37-server #81-Ubuntu SMP Fri Dec 2 20:49:12 UTC 2011 x86_64 GNU/Linux
admin at vs-master:~$ apt-cache policy kvm
kvm:
  Installé : (aucun)
  Candidat : 1:84+dfsg-0ubuntu16+0.12.3+noroms+0ubuntu9.16
 Table de version :
     1:84+dfsg-0ubuntu16+0.12.3+noroms+0ubuntu9.16 0
        500 http://fr.archive.ubuntu.com/ubuntu/ lucid-updates/main Packages
     1:84+dfsg-0ubuntu16+0.12.3+noroms+0ubuntu9.15 0
        500 http://security.ubuntu.com/ubuntu/ lucid-security/main Packages
     1:84+dfsg-0ubuntu16+0.12.3+noroms+0ubuntu9 0
        500 http://fr.archive.ubuntu.com/ubuntu/ lucid/main Packages

Host :
admin at vs-maven:~$ lsb_release -rd
Description:	Ubuntu 10.04.3 LTS
Release:	10.04
admin at vs-maven:~$ uname -a
Linux vs-maven 2.6.32-37-server #81-Ubuntu SMP Fri Dec 2 20:49:12 UTC 2011 x86_64 GNU/Linux

3. I've tried to download 5 times a big file (wget http://192.168.1.213:8081/artifactory/repo/org/hibernate/hibernate-core/4.0.0.CR2/hibernate-core-4.0.0.CR2.jar) without problem.
It seems the problem happends when the server is asked to download several small files.
>From my client, I did :
$ wget -l 2 -r http://192.168.1.213:8081/artifactory/repo/org/jboss/seam/faces/seam-faces/

And after crawling a bit, it stuck on "http://192.168.1.213:8081/artifactory/repo/org/jboss/seam/faces/seam-faces/3.1.0-SNAPSHOT/" : wget is waiting for something, the little "spaceship" ("<=>") keeps going left to right & reverses. Later in my browser, the same page is displayed correctly. If I cancel & retry the same command, it sticks somewhere else.
I've tried the same command with --timeout=5 and it sometime times out to correctly get it later in another retry.

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https://bugs.launchpad.net/bugs/616064

Title:
  Broken networking in kvm guests

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