桥接br0 配置如下：

[root@localhost network-scripts]# cat ifcfg-em1

DEVICE=em1

TYPE=Ethernet

#HWADDR=**:**:**:**:**:**

ONBOOT=yes

NM_CONTROLLED=no

BRIDGE=br0

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[root@localhost network-scripts]# cat ifcfg-br0

DEVICE=br0

TYPE=Bridge

NM_CONTROLLED=no

BOOTPROTO=static

ONBOOT=yes

IPADDR="192.168.77.80"

NETMASK="255.255.255.0"

GATEWAY="192.168.77.1"