no network from br0

[acbaldwi]

Hello,

 

I'm trying to get KVM working for the first time and seem to have run into a snag where the vm's dont get a ip address from the br0 network (bridged mode). This happens on Windows VM's and linux vm's  (ive tried 3x now) as well as vm's that were imported form vmware.....

 

I should mention here that i have installed the drivers for the hardware

 

Here is a sample of a kvm xml file, and a screenshot of my network settings, as always thanks for anyhelp

 

 

 

<domain type='kvm' id='10'>

  <name>Windows Server 2008</name>

  <uuid>0e2f63c5-e84e-4cf3-0e55-8763ea131434</uuid>

  <metadata>

    <vmtemplate xmlns="unraid" name="Windows Server 2008" icon="windows7.png" os="windows2008"/>

  </metadata>

  <memory unit='KiB'>2097152</memory>

  <currentMemory unit='KiB'>2097152</currentMemory>

  <memoryBacking>

    <nosharepages/>

  </memoryBacking>

  <vcpu placement='static'>2</vcpu>

  <cputune>

    <vcpupin vcpu='0' cpuset='0'/>

    <vcpupin vcpu='1' cpuset='1'/>

  </cputune>

  <resource>

    <partition>/machine</partition>

  </resource>

  <os>

    <type arch='x86_64' machine='pc-i440fx-2.7'>hvm</type>

  </os>

  <features>

    <acpi/>

    <apic/>

    <hyperv>

      <relaxed state='on'/>

      <vapic state='on'/>

      <spinlocks state='on' retries='8191'/>

      <vendor_id state='on' value='none'/>

    </hyperv>

  </features>

  <cpu mode='host-passthrough'>

    <topology sockets='1' cores='1' threads='2'/>

  </cpu>

  <clock offset='localtime'>

    <timer name='hypervclock' present='yes'/>

    <timer name='hpet' present='no'/>

  </clock>

  <on_poweroff>destroy</on_poweroff>

  <on_reboot>restart</on_reboot>

  <on_crash>restart</on_crash>

  <devices>

    <emulator>/usr/local/sbin/qemu</emulator>

    <disk type='file' device='disk'>

      <driver name='qemu' type='raw' cache='writeback'/>

      <source file='/mnt/user/VM/Windows Server 2008/vdisk1.img'/>

      <backingStore/>

      <target dev='hdc' bus='sata'/>

      <boot order='1'/>

      <alias name='sata0-0-2'/>

      <address type='drive' controller='0' bus='0' target='0' unit='2'/>

    </disk>

    <disk type='file' device='cdrom'>

      <driver name='qemu' type='raw'/>

      <source file='/mnt/user/isos/en_windows_server_2008_r2_x64_dvd_x15-50365.iso'/>

      <backingStore/>

      <target dev='hda' bus='usb'/>

      <readonly/>

      <boot order='2'/>

      <alias name='usb-disk0'/>

      <address type='usb' bus='0' port='1'/>

    </disk>

    <disk type='file' device='cdrom'>

      <driver name='qemu' type='raw'/>

      <source file='/mnt/user/isos/virtio-win-0.1.126-2.iso'/>

      <backingStore/>

      <target dev='hdb' bus='usb'/>

      <readonly/>

      <alias name='usb-disk1'/>

      <address type='usb' bus='0' port='2'/>

    </disk>

    <controller type='usb' index='0' model='ich9-ehci1'>

      <alias name='usb'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x7'/>

    </controller>

    <controller type='usb' index='0' model='ich9-uhci1'>

      <alias name='usb'/>

      <master startport='0'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0' multifunction='on'/>

    </controller>

    <controller type='usb' index='0' model='ich9-uhci2'>

      <alias name='usb'/>

      <master startport='2'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x1'/>

    </controller>

    <controller type='usb' index='0' model='ich9-uhci3'>

      <alias name='usb'/>

      <master startport='4'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x2'/>

    </controller>

    <controller type='pci' index='0' model='pci-root'>

      <alias name='pci.0'/>

    </controller>

    <controller type='sata' index='0'>

      <alias name='sata0'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>

    </controller>

    <controller type='virtio-serial' index='0'>

      <alias name='virtio-serial0'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>

    </controller>

    <interface type='bridge'>

      <mac address='52:54:00:a3:be:33'/>

      <source bridge='br0'/>

      <target dev='vnet1'/>

      <model type='virtio'/>

      <alias name='net0'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>

    </interface>

    <serial type='pty'>

      <source path='/dev/pts/1'/>

      <target port='0'/>

      <alias name='serial0'/>

    </serial>

    <console type='pty' tty='/dev/pts/1'>

      <source path='/dev/pts/1'/>

      <target type='serial' port='0'/>

      <alias name='serial0'/>

    </console>

    <channel type='unix'>

      <source mode='bind' path='/var/lib/libvirt/qemu/channel/target/domain-10-Windows Server 2008/org.qemu.guest_agent.0'/>

      <target type='virtio' name='org.qemu.guest_agent.0' state='disconnected'/>

      <alias name='channel0'/>

      <address type='virtio-serial' controller='0' bus='0' port='1'/>

    </channel>

    <input type='mouse' bus='ps2'>

      <alias name='input0'/>

    </input>

    <input type='keyboard' bus='ps2'>

      <alias name='input1'/>

    </input>

    <graphics type='vnc' port='5901' autoport='yes' websocket='5701' listen='0.0.0.0' keymap='en-us'>

      <listen type='address' address='0.0.0.0'/>

    </graphics>

    <video>

      <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1' primary='yes'/>

      <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='0x06' function='0x0'/>

    </memballoon>

  </devices>

  <seclabel type='none' model='none'/>

  <seclabel type='dynamic' model='dac' relabel='yes'>

    <label>+0:+100</label>

    <imagelabel>+0:+100</imagelabel>

  </seclabel>

</domain>

 

Edited July 18, 2017 by acbaldwi
add info

[bonienl]

Did you install the virtio drivers for your network controller in Windows?

 

[acbaldwi]

Just now, bonienl said:

Did you install the virtio drivers for your network controller in Windows?

 

Yup sure did, this is the thing i was troubleshooting on my own when i wrecked my network  thanks for that again btw

[acbaldwi]

I think i may have it, i had my network set to bond both of my nics with one being a backup the other the primary.... removed the bond and were good not i suspect thats not the correct behavior though

[bonienl]

It should work with both bonding enabled or disabled. The key is to have bridging enabled and use 'br0' for the VM.

 

If you use just a single interface then bonding is not really needed.

 

[jsclayton]

Wondering if this has been addressed? In an Ubuntu VM I'm not able to access the host network when using `br0` while it's bonded with `balance-rr`. If I undo the bonding it works as expected.

 

Diagnostics and VM xml definition attached. Thanks!

brontostorus-diagnostics-20180906-1008.zip

vm.xml

[bonienl]

Tested a new Ubuntu install on a system with Unraid 6.5.3 and a bonded interface with 4 members set as 802.3ad (lacp) and bridge enabled.

All working correctly.

In general it is not recommended to use the round-robin setting, many switches can not cope with the changing link.