[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1153364

Title:
  trouble with guest network connectivity when host is using a bonded
  interface

Status in linux package in Ubuntu:
  Expired
Status in qemu-kvm package in Ubuntu:
  Expired

Bug description:
  i'm seeing poor/intermittent/degrading network connectivity for
  guests, when the host is using a bonded interface.

  in a nutshell, the network configuration is as follows:  the physical
  interfaces [eth0 and eth1] are bonded together as bond0 [i've tried
  various bond modes - see below].  a bridge interface [br0] is
  configured with bond0 attached to it.  all guests use br0 as their
  "forward" interface.  my tests have generally included a single host,
  with two guests running on it.  both guests are running ubuntu 12.10.

  it depends slightly on the particulars of the configuration, but the
  most prevalent symptom is that a newly booted guest will at first
  respond to pings [with little to no loss], and the guest will be able
  to ping other hosts on the network, but as time passes, more and more
  packets are dropped.  eventually, virtually all ping requests go
  unanswered.  in some cases, it appears that restarting networking on
  the guest will fix this, partially and temporarily.  the guest will
  begin to reply 4-5 packets after restarting networking, but does not
  respond consistently, eventually failing again as before.  i've also
  noticed that in some cases where ping against the guest has not yet
  begun to fail, if i ping something else on the network from the guest,
  this causes the pings against the guest to abruptly fail.

  i know this is all quite abstract - i've spent quite a bit a time
  trying to isolate various variables, and while i've made some
  progress, i think some guidance would be helpful.

  what i have noticed specifically is if i attach a physical device
  [e.g. eth0 or eth1] to the bridge [instead of bond0], things seem to
  work ok.  also, if i use active-backup as the bonding mode, things
  seem to work ok.  i was initially using balance-alb as the bonding
  mode, and have also tested balance-rr as the bonding mode.  both
  exhibit the above symptoms.  i've also tried various network card
  models for the guests [realtek, e1000, and virtio].  this has not had
  any impact on the symptoms.  lastly,  the two guests have been able to
  ping each other, with no issues, regardless of the various network
  settings.  at the moment, i have switched back to active-backup, so
  this is reflected in the below information.

  here is a bit of configuration info:

  host os/package info:
  >lsb_release -rd
  Description:  Ubuntu 12.10
  Release:      12.10

  >apt-cache policy qemu-kvm
  qemu-kvm:
    Installed: 1.2.0+noroms-0ubuntu2.12.10.3
    Candidate: 1.2.0+noroms-0ubuntu2.12.10.3
    Version table:
   *** 1.2.0+noroms-0ubuntu2.12.10.3 0
          500 http://us.archive.ubuntu.com/ubuntu/ quantal-updates/main amd64 
Packages
          100 /var/lib/dpkg/status
       1.2.0+noroms-0ubuntu2.12.10.2 0
          500 http://security.ubuntu.com/ubuntu/ quantal-security/main amd64 
Packages
       1.2.0+noroms-0ubuntu2 0
          500 http://us.archive.ubuntu.com/ubuntu/ quantal/main amd64 Packages

  >dpkg -l | grep -i virt
  ii  libvirt-bin                        0.9.13-0ubuntu12.2                     
   amd64        programs for the libvirt library
  ii  libvirt0                           0.9.13-0ubuntu12.2                     
   amd64        library for interfacing with different virtualization systems
  ii  python-libvirt                     0.9.13-0ubuntu12.2                     
   amd64        libvirt Python bindings
  ii  qemu-kvm                           1.2.0+noroms-0ubuntu2.12.10.3          
   amd64        Full virtualization on supported hardware
  ii  virtinst                           0.600.2-1ubuntu1                       
   all          Programs to create and clone virtual machines

  >dpkg -l | grep -i qemu
  ii  qemu-common                        1.2.0+noroms-0ubuntu2.12.10.3          
   all          qemu common functionality (bios, documentation, etc)
  ii  qemu-kvm                           1.2.0+noroms-0ubuntu2.12.10.3          
   amd64        Full virtualization on supported hardware
  ii  qemu-utils                         1.2.0+noroms-0ubuntu2.12.10.3          
   amd64        qemu utilities
  ii  vgabios                            0.7a-3ubuntu2                          
   all          VGA BIOS software for the Bochs and Qemu emulated VGA card

  
  host network config:
  >egrep -v '(^[[:space:]]*#|^[[:space:]]*$)' /etc/network/interfaces 
  auto lo
  iface lo inet loopback

  auto eth0
  iface eth0 inet manual
        bond-master bond0

  auto eth1
  iface eth1 inet manual
        bond-master bond0

  auto bond0
  iface bond0 inet manual
        bond-mode active-backup
        bond-slaves eth0 eth1
        bond-primary eth0
        bond-primary_reselect better

  auto br0
  iface br0 inet static
        bridge_ports bond0
        bridge_stp off
        bridge_waitport 0
        bridge_maxwait 0
        bridge_maxage 0
        bridge_fd 0     
        bridge_ageing 0
        address 192.168.1.60
        netmask 255.255.255.0
        gateway 192.168.1.1

  >brctl show
  bridge name   bridge id               STP enabled     interfaces
  br0           8000.0019b9ec43f3       no              bond0
                                                        vnet0

  >ifconfig
  bond0     Link encap:Ethernet  HWaddr 00:19:b9:ec:43:f3  
            UP BROADCAST RUNNING MASTER MULTICAST  MTU:1500  Metric:1
            RX packets:2527 errors:0 dropped:146 overruns:0 frame:0
            TX packets:2129 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:0 
            RX bytes:765773 (765.7 KB)  TX bytes:1071088 (1.0 MB)

  br0       Link encap:Ethernet  HWaddr 00:19:b9:ec:43:f3  
            inet addr:192.168.1.60  Bcast:192.168.1.255  Mask:255.255.255.0
            inet6 addr: fe80::219:b9ff:feec:43f3/64 Scope:Link
            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
            RX packets:2189 errors:0 dropped:0 overruns:0 frame:0
            TX packets:1643 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:0 
            RX bytes:669115 (669.1 KB)  TX bytes:1026954 (1.0 MB)

  eth0      Link encap:Ethernet  HWaddr 00:19:b9:ec:43:f3  
            UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
            RX packets:146 errors:0 dropped:146 overruns:0 frame:0
            TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:1000 
            RX bytes:10568 (10.5 KB)  TX bytes:0 (0.0 B)

  eth1      Link encap:Ethernet  HWaddr 00:19:b9:ec:43:f3  
            UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
            RX packets:2381 errors:0 dropped:0 overruns:0 frame:0
            TX packets:2129 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:1000 
            RX bytes:755205 (755.2 KB)  TX bytes:1071088 (1.0 MB)

  lo        Link encap:Local Loopback  
            inet addr:127.0.0.1  Mask:255.0.0.0
            inet6 addr: ::1/128 Scope:Host
            UP LOOPBACK RUNNING  MTU:16436  Metric:1
            RX packets:3704 errors:0 dropped:0 overruns:0 frame:0
            TX packets:3704 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:0 
            RX bytes:1256952 (1.2 MB)  TX bytes:1256952 (1.2 MB)

  vnet0     Link encap:Ethernet  HWaddr fe:54:00:f3:b2:32  
            inet6 addr: fe80::fc54:ff:fef3:b232/64 Scope:Link
            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
            RX packets:133 errors:0 dropped:0 overruns:0 frame:0
            TX packets:723 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:500 
            RX bytes:12368 (12.3 KB)  TX bytes:546331 (546.3 KB)

  >virsh net-list --all
  Name                 State      Autostart
  -----------------------------------------
  host-bridge          active     no        
  direct-macvtap       inactive   no

  >virsh net-info host-bridge
  Name            host-bridge
  UUID            ecb96001-1aaa-0643-6ad3-bcdf7a43775a
  Active:         yes
  Persistent:     yes
  Autostart:      no
  Bridge:         br0

  >virsh net-dumpxml host-bridge
  <network>
    <name>host-bridge</name>
    <uuid>ecb96001-1aaa-0643-6ad3-bcdf7a43775a</uuid>
    <forward mode='bridge'/>
    <bridge name='br0' />
  </network>

  guest config:
  >virsh list --all
   Id    Name                           State
  ----------------------------------------------------
   1     aurora                         running
   -     ecto                           shut off
   -     proto                          shut off

  >virsh dominfo aurora
  Id:             1
  Name:           aurora
  UUID:           542c39da-f539-6014-6f91-36575f0aef4e
  OS Type:        hvm
  State:          running
  CPU(s):         1
  CPU time:       26.8s
  Max memory:     1048576 KiB
  Used memory:    1048576 KiB
  Persistent:     yes
  Autostart:      disable
  Managed save:   no
  Security model: apparmor
  Security DOI:   0
  Security label: libvirt-542c39da-f539-6014-6f91-36575f0aef4e (enforcing)

  >virsh dumpxml aurora --security-info
  <domain type='kvm' id='1'>
    <name>aurora</name>
    <uuid>542c39da-f539-6014-6f91-36575f0aef4e</uuid>
    <description>software builder [64-bit]</description>
    <memory unit='KiB'>1048576</memory>
    <currentMemory unit='KiB'>1048576</currentMemory>
    <vcpu placement='static'>1</vcpu>
    <os>
      <type arch='x86_64' machine='pc-1.0'>hvm</type>
      <boot dev='hd'/>
    </os>
    <features>
      <acpi/>
      <apic/>
      <pae/>
    </features>
    <cpu mode='custom' match='exact'>
      <model fallback='allow'>core2duo</model>
      <vendor>Intel</vendor>
      <feature policy='require' name='pbe'/>
      <feature policy='require' name='tm2'/>
      <feature policy='require' name='est'/>
      <feature policy='require' name='ds'/>
      <feature policy='require' name='ss'/>
      <feature policy='require' name='ht'/>
      <feature policy='require' name='dca'/>
      <feature policy='require' name='lahf_lm'/>
      <feature policy='require' name='tm'/>
      <feature policy='require' name='cx16'/>
      <feature policy='require' name='vmx'/>
      <feature policy='require' name='ds_cpl'/>
      <feature policy='require' name='xtpr'/>
      <feature policy='require' name='acpi'/>
    </cpu>
    <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='/srv/vc/disks/aurora'/>
        <target dev='sda' bus='sata'/>
        <alias name='sata0-0-0'/>
        <address type='drive' controller='0' bus='0' target='0' unit='0'/>
      </disk>
      <disk type='file' device='cdrom'>
        <driver name='qemu' type='raw'/>
        <target dev='sdb' bus='sata'/>
        <readonly/>
        <alias name='sata0-0-1'/>
        <address type='drive' controller='0' bus='0' target='0' unit='1'/>
      </disk>
      <controller type='sata' index='0'>
        <alias name='sata0'/>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x04' 
function='0x0'/>
      </controller>
      <controller type='usb' index='0'>
        <alias name='usb0'/>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x01' 
function='0x2'/>
      </controller>
      <interface type='network'>
        <mac address='52:54:00:f3:b2:32'/>
        <source network='host-bridge'/>
        <target dev='vnet0'/>
        <model type='virtio'/>
        <driver name='vhost' txmode='iothread'/>
        <alias name='net0'/>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x03' 
function='0x0'/>
      </interface>
      <input type='mouse' bus='ps2'/>
      <graphics type='vnc' port='5900' autoport='yes' listen='0.0.0.0'>
        <listen type='address' address='0.0.0.0'/>
      </graphics>
      <video>
        <model type='cirrus' vram='9216' heads='1'/>
        <alias name='video0'/>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x02' 
function='0x0'/>
      </video>
      <memballoon model='virtio'>
        <alias name='balloon0'/>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x05' 
function='0x0'/>
      </memballoon>
    </devices>
    <seclabel type='dynamic' model='apparmor' relabel='yes'>
      <label>libvirt-542c39da-f539-6014-6f91-36575f0aef4e</label>
      <imagelabel>libvirt-542c39da-f539-6014-6f91-36575f0aef4e</imagelabel>
    </seclabel>
  </domain>

  guest os networking config:
  >hostname
  aurora

  >ifconfig
  eth0      Link encap:Ethernet  HWaddr 52:54:00:f3:b2:32  
            inet addr:192.168.1.70  Bcast:192.168.1.255  Mask:255.255.255.0
            inet6 addr: fe80::5054:ff:fef3:b232/64 Scope:Link
            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
            RX packets:2397 errors:0 dropped:8 overruns:0 frame:0
            TX packets:544 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:1000 
            RX bytes:1576649 (1.5 MB)  TX bytes:54356 (54.3 KB)

  lo        Link encap:Local Loopback  
            inet addr:127.0.0.1  Mask:255.0.0.0
            inet6 addr: ::1/128 Scope:Host
            UP LOOPBACK RUNNING  MTU:16436  Metric:1
            RX packets:0 errors:0 dropped:0 overruns:0 frame:0
            TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:0 
            RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

  thanks
  -ben
  --- 
  Architecture: amd64
  DistroRelease: Ubuntu 12.10
  MarkForUpload: True
  Package: qemu-kvm 1.2.0+noroms-0ubuntu2.12.10.3
  PackageArchitecture: amd64
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  Uname: Linux 3.5.0-25-generic x86_64
  UserGroups:
  --- 
  Architecture: amd64
  DistroRelease: Ubuntu 12.10
  MarkForUpload: True
  Package: qemu-kvm 1.2.0+noroms-0ubuntu2.12.10.3
  PackageArchitecture: amd64
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  Uname: Linux 3.5.0-25-generic x86_64
  UserGroups:

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