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KVM 虚拟 IP 地址在 HOST 上不起作用，在 GUEST 上起作用

tag-icon • tag-icon networking virtualization kvm-virtualization ubuntu-12.04
KVM 虚拟 IP 地址在 HOST 上不起作用，在 GUEST 上起作用

我有一个由以下内容组成的设置：

-> 运行 KVM 的主机具有以下网络配置：

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet manual

# The bridge used by GUESTS
auto br0
iface br0 inet static
  bridge_ports eth0
  bridge_stp off
  bridge_fd 9
  bridge_hello 2
  bridge_maxage 12
  bridge_maxwait 0

  # Configure the bridge to act also as a maintenance interface
  address AAA.BBB.CCC.62
  netmask 255.255.255.0
  gateway AAA.BBB.CCC.1
  dns-nameservers AAA.BBB.CCC.1

# For HOST-GUEST Communications
auto maintenancebr0
iface maintenancebr0 inet static
  gateway FFF.XXX.XXX.2
  dns-nameservers FFF.XXX.XXX.2
  address FFF.XXX.XXX.1
  netmask 255.255.255.128
  # Add this as a gateway with a lower metric so that is used for fallback only
  post-up route add default gw FFF.XXX.XXX.2 metric 2
  pre-down route del default gw FFF.XXX.XXX.2

# The interface giving me troubles, can't access this IP through a direct cable connection
auto eth0:0
iface eth0:0 inet static
   address FFF.XXX.XXX.188
   netmask 255.255.255.240

-> 使用以下网络配置运行的客户机：

# Loopback interface:
auto lo
iface lo inet loopback

# Ethernet 0 interface:
auto eth0
iface eth0 inet static
   address AAA.BBB.CCC.67
   netmask 255.255.255.0
   gateway AAA.BBB.CCC.1
   dns-nameservers AAA.BBB.CCC.1

# For HOST-GUEST communication (fallback) connected to maintenancebr0 using libvirt
auto eth7
iface eth7 inet static
address FFF.XXX.XXX.2
netmask 255.255.255.128

# Guest also has a maintenance IP address (this one works fine with a direct cable connection)
auto eth0:0
iface eth0:0 inet static
   address FFF.XXX.XXX.178
   netmask 255.255.255.240

我的问题如下，其余一切正常：将电缆直接连接到 eth0 端口上的主机，并将我的计算机配置为 IP 地址 FFF.XXX.XXX.177，这样我就可以正常访问 FFF.XXX.XXX.178 上的客户机，但是我似乎无法访问 FFF.XXX.XXX.188 上的主机，为什么？

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