注意：我所配置的环境中虚拟机和真机的IP地址均为172.25.37.0/24网段，你配置时需要将这一项改为你的IP网段。
【1】真机配置
[root@random ~]# iptables -t nat -I POSTROUTING -s 172.25.37.0/24 -j MASQUERADE
[root@random ~]# cat /etc/resolv.conf
# Generated by NetworkManager
search ilt.example.com example.com
nameserver 114.114.114.114
【2】虚拟机配置
[root@server1 ~]# cat /etc/hosts
114.114.114.114 www.baidu.com
[root@server1 ~]# route add default gw 172.25.37.250 注意：这个IP地址为真机IP地址。
[root@server1 ~]# ping www.baidu.com
PING www.baidu.com (114.114.114.114) 56(84) bytes of data.
64 bytes from www.baidu.com (114.114.114.114): icmp_seq=1 ttl=63 time=31.7 ms
64 bytes from www.baidu.com (114.114.114.114): icmp_seq=2 ttl=77 time=27.7 ms