1，在批量服务器m01上执行
第一个历程：内网172.16.1.0网段内网通过10.0.0.61进行转发
iptables -t nat -A POSTROUTING -s 172.16.1.0/24 -j SNAT --to 10.0.0.61
第二个历程：外网机器上打开转发
echo "net.ipv4.ip_forward = 1" >>/etc/sysctl.conf
sysctl -p
2，在内网机器上，更改其网关为 10.0.0.61
vim /etc/sysconfig/network-scripts/ifcfg-eth0
GATEWAY=10.0.0.61
最后重启网络服务即可。
systemctl restart network
最后的现象：（从61跳转到外网）
PING baidu.com (220.181.38.148) 56(84) bytes of data.
64 bytes from 220.181.38.148 (220.181.38.148): icmp_seq=1 ttl=128 time=21.2 ms
From gateway (10.0.0.61) icmp_seq=2 Redirect Host(New nexthop: 10.0.0.254 (10.0.0.254))
From gateway (10.0.0.61): icmp_seq=2 Redirect Host(New nexthop: 10.0.0.254 (10.0.0.254))
64 bytes from 220.181.38.148 (220.181.38.148): icmp_seq=2 ttl=128 time=26.1 ms
64 bytes from 220.181.38.148 (220.181.38.148): icmp_seq=3 ttl=128 time=33.0 ms
64 bytes from 220.181.38.148 (220.181.38.148): icmp_seq=4 ttl=128 time=23.2 ms
