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
-----------------------------------------------------
[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"
