在网卡设置里，将连接方式设为'桥接网卡'


更改网卡配置文件
[root@localhost tab]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
HWADDR=08:00:27:27:57:C8
TYPE=Ethernet
#UUID=500d1445-843f-4312-9ab0-ac228338bad8
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=dhcp
IPV6INIT=no
USERCTL=no

重启网络
[root@localhost tab]# service network restart

之后可以正常连接到网络
[root@localhost tab]# ping www.baidu.com
PING www.a.shifen.com (103.235.46.39) 56(84) bytes of data.
64 bytes from 103.235.46.39: icmp_seq=1 ttl=49 time=47.0 ms
64 bytes from 103.235.46.39: icmp_seq=2 ttl=49 time=45.4 ms

名称栏目：VirtualBoxLinux下无法上网的解决方法
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