我查看了这里的问题以及我在谷歌上找到的所有教程，但似乎都无法解决我的问题。我有一台 Ubuntu 16.04 服务器，上面安装了很多软件（Unifi、Unifi Video、UNMS、Bluecherry、Apache2）。我需要一个仅支持 14.04（mFi）的软件。因此，我有只在 16.04 上更新的软件和在 16.04 上无法运行但出于电费原因需要在 1 台 PC 上使用的软件。我有运行 KVM 的 16.04，可以很好地安装 VM。我还创建了一个从路由器接收 DHCP 的 br0。我需要 14.04 VM 也从路由器获取 DHCP。主机上的 ifconfig 如下所示：
br0 Link encap:Ethernet HWaddr 00:1c:c0:38:c5:42
inet addr:10.11.11.254 Bcast:10.11.11.255 Mask:255.255.255.0
inet6 addr: fe80::21c:c0ff:fe38:c542/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:77330 errors:0 dropped:0 overruns:0 frame:0
TX packets:48141 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:97552697 (97.5 MB) TX bytes:31018242 (31.0 MB)
br-441049093d8f Link encap:Ethernet HWaddr 02:42:29:9b:ba:1c
inet addr:172.18.0.1 Bcast:172.18.255.255 Mask:255.255.0.0
inet6 addr: fe80::42:29ff:fe9b:ba1c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3 errors:0 dropped:0 overruns:0 frame:0
TX packets:180 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:84 (84.0 B) TX bytes:8560 (8.5 KB)
br-f26207b68430 Link encap:Ethernet HWaddr 02:42:62:fb:8a:5e
inet addr:172.19.0.1 Bcast:172.19.255.255 Mask:255.255.0.0
inet6 addr: fe80::42:62ff:fefb:8a5e/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:55749 errors:0 dropped:0 overruns:0 frame:0
TX packets:47179 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:7779523 (7.7 MB) TX bytes:26110547 (26.1 MB)
docker0 Link encap:Ethernet HWaddr 02:42:1e:8a:a7:a3
inet addr:172.17.0.1 Bcast:172.17.255.255 Mask:255.255.0.0
UP BROADCAST MULTICAST MTU:1500 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)
eth0 Link encap:Ethernet HWaddr 00:1c:c0:38:c5:42
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:14320804 errors:0 dropped:88 overruns:0 frame:0
TX packets:9161214 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:18267999423 (18.2 GB) TX bytes:4224704433 (4.2 GB)
Interrupt:20 Memory:e8200000-e8220000
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:65536 Metric:1
RX packets:455114 errors:0 dropped:0 overruns:0 frame:0
TX packets:455114 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:323006260 (323.0 MB) TX bytes:323006260 (323.0 MB)
veth6087736 Link encap:Ethernet HWaddr 92:6b:9e:30:3f:3f
inet6 addr: fe80::906b:9eff:fe30:3f3f/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2323 errors:0 dropped:0 overruns:0 frame:0
TX packets:4719 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:631966 (631.9 KB) TX bytes:451342 (451.3 KB)
veth0be9933 Link encap:Ethernet HWaddr f6:4b:44:26:95:31
inet6 addr: fe80::f44b:44ff:fe26:9531/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:22962 errors:0 dropped:0 overruns:0 frame:0
TX packets:23170 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1511612 (1.5 MB) TX bytes:6634025 (6.6 MB)
veth4721a38 Link encap:Ethernet HWaddr a6:30:ad:6b:99:c9
inet6 addr: fe80::a430:adff:fe6b:99c9/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:51401 errors:0 dropped:0 overruns:0 frame:0
TX packets:48796 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:23393519 (23.3 MB) TX bytes:22044039 (22.0 MB)
veth4bfc810 Link encap:Ethernet HWaddr 96:a8:06:b1:01:21
inet6 addr: fe80::94a8:6ff:feb1:121/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:35421 errors:0 dropped:0 overruns:0 frame:0
TX packets:38362 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:38357384 (38.3 MB) TX bytes:27451189 (27.4 MB)
veth670940c Link encap:Ethernet HWaddr ba:ee:fa:d6:a2:3f
inet6 addr: fe80::b8ee:faff:fed6:a23f/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:53627 errors:0 dropped:0 overruns:0 frame:0
TX packets:44489 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:38465696 (38.4 MB) TX bytes:49446336 (49.4 MB)
vethd484c2b Link encap:Ethernet HWaddr 36:53:04:68:c2:d1
inet6 addr: fe80::3453:4ff:fe68:c2d1/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:26617 errors:0 dropped:0 overruns:0 frame:0
TX packets:20841 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4291112 (4.2 MB) TX bytes:18090223 (18.0 MB)
vethda042e9 Link encap:Ethernet HWaddr 36:6b:69:35:34:34
inet6 addr: fe80::346b:69ff:fe35:3434/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:6563 errors:0 dropped:0 overruns:0 frame:0
TX packets:11108 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:10448286 (10.4 MB) TX bytes:10590365 (10.5 MB)
vnet0 Link encap:Ethernet HWaddr fe:54:00:88:62:21
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:71 errors:0 dropped:0 overruns:0 frame:0
TX packets:586 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:11162 (11.1 KB) TX bytes:53777 (53.7 KB)
其中一个程序还安装了 docker 软件，但我很确定其他东西都是经过无数次尝试才获得的。
我的主机 etc/network/interfaces 目前看起来像这样（再次经过我无数次的尝试）：
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
iface eth0 inet manual
# bridge interface for kvm
auto br0
iface br0 inet dhcp
bridge_ports eth0 vnet1 vnet0 vethda042e9 vethd484c2b veth670940c veth4bfc810 veth4721a38 veth0be9933 veth6087736
bridge_stp off
bridge_fd 0
bridge_maxwait 0
这真的有用吗？还是我要重新安装所有东西到 esxi？VMware 可以这样做。Virtualbox 也可以这样做。为什么我不能在以太网和虚拟机之间创建 L2 桥？我确信我甚至可以使用 Windows Hypervisor 做到这一点。
防火墙已禁用。不要从虚拟机中安装任何东西，因为一段时间后，如果在安装所有东西之前 DHCP 失败，那就完全是浪费时间。尝试通过终端安装。设置另一个桌面 Ubuntu 来安装虚拟网络管理器，然后从那里安装大约 9 次
是的，我正在使用 libvirt。最初添加到 br0 的唯一接口是 eth0，但仍然没有 DHCP。我开始添加其他接口，希望这样可以工作，但没有成功。
这是 xml：
<domain type='kvm' id='11'>
<name>mFi</name>
<uuid>096832a0-76bf-488c-88dd-f0bcae02046c</uuid>
<memory unit='KiB'>4194304</memory>
<currentMemory unit='KiB'>4194304</currentMemory>
<vcpu placement='static'>1</vcpu>
<resource>
<partition>/machine</partition>
</resource>
<os>
<type arch='x86_64' machine='pc-i440fx-xenial'>hvm</type>
</os>
<features>
<acpi/>
<apic/>
</features>
<cpu mode='custom' match='exact'>
<model fallback='allow'>core2duo</model>
</cpu>
<clock offset='utc'>
<timer name='rtc' tickpolicy='catchup'/>
<timer name='pit' tickpolicy='delay'/>
<timer name='hpet' present='no'/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<pm>
<suspend-to-mem enabled='no'/>
<suspend-to-disk enabled='no'/>
</pm>
<devices>
<emulator>/usr/bin/kvm-spice</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/var/lib/libvirt/images/mFi.img'/>
<backingStore/>
<target dev='vda' bus='virtio'/>
<boot order='1'/>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07'
function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<source file='/var/lib/libvirt/boot/ubuntu-14.04.5-server-amd64.iso'/>
<backingStore/>
<target dev='hda' bus='ide'/>
<readonly/>
<boot order='2'/>
<alias name='ide0-0-0'/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<controller type='usb' index='0' model='ich9-ehci1'>
<alias name='usb'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06'
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='0x06'
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='0x06'
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='0x06'
function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'>
<alias name='pci.0'/>
</controller>
<controller type='ide' index='0'>
<alias name='ide'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01'
function='0x1'/>
</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='52:54:00:88:62:21'/>
<source bridge='br0'/>
<target dev='vnet0'/>
<model type='rtl8139'/>
<boot order='3'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
</interface>
<serial type='pty'>
<source path='/dev/pts/0'/>
<target port='0'/>
<alias name='serial0'/>
</serial>
<console type='pty' tty='/dev/pts/0'>
<source path='/dev/pts/0'/>
<target type='serial' port='0'/>
<alias name='serial0'/>
</console>
<channel type='spicevmc'>
<target type='virtio' name='com.redhat.spice.0' state='disconnected'/>
<alias name='channel0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='vnc' port='5900' autoport='yes' listen='127.0.0.1'>
<listen type='address' address='127.0.0.1'/>
</graphics>
<sound model='ich6'>
<alias name='sound0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
</sound>
<video>
<model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1'/>
<alias name='video0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02'
function='0x0'/>
</video>
<redirdev bus='usb' type='spicevmc'>
<alias name='redir0'/>
</redirdev>
<redirdev bus='usb' type='spicevmc'>
<alias name='redir1'/>
</redirdev>
<memballoon model='virtio'>
<alias name='balloon0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08'
function='0x0'/>
</memballoon>
</devices>
<seclabel type='dynamic' model='apparmor' relabel='yes'>
<label>libvirt-096832a0-76bf-488c-88dd-f0bcae02046c</label>
<imagelabel>libvirt-096832a0-76bf-488c-88dd-f0bcae02046c</imagelabel>
</seclabel>
</domain>
当我尝试编辑配置时，它显示以下内容：
<interface type='bridge'>
<mac address='52:54:00:88:62:21'/>
<source bridge='br0'/>
<model type='rtl8139'/>
<boot order='3'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
</interface>
甚至认为转储显示了 alis 和目标。他们不是来干掉的。不会让我在评论中这样做。
主机不是这个：
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
iface eth0 inet manual
# bridge interface for kvm
auto br0
iface br0 inet dhcp
bridge_ports eth0
bridge_stp off
bridge_fd 0
bridge_maxwait 0
不知道您所说的访客网络配置是什么意思，这不是我们刚刚检查过的吗？
答案1
让我们看看您的虚拟机的网络接口配置。
<interface type='bridge'>
<mac address='52:54:00:88:62:21'/>
<source bridge='br0'/>
<target dev='vnet0'/>
<model type='rtl8139'/>
<boot order='3'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
</interface>
首先，<target>当桥接到现有桥时，它是可选的；通常您根本不应该指定它。我会删除这一行。
其次，您定义了一个<alias>，但该name属性是错误的。所有别名都必须以文字字符串 开头ua-。在 libvirt 3.9.0 之前，此选项不存在。它也是可选的，因此您可以将其删除。
使用 编辑虚拟机virsh edit vmname。如果在编辑时虚拟机正在运行，则必须停止并重新启动虚拟机才能使设置生效。
除此之外，如果虚拟机无法接入网络，问题很可能出在客户机配置或本地物理网络（例如上游交换机）上。