服务器一般使用数据中心分配的IP 地址，有时需要在服务器上使用异地数据中心的IP 地址，以实现某些特殊 的功能，但互联网体系结构使这种需求难以实现。使用VPN 技术在互联网上建立隧道，将服务器与异地数据中心在网络层直 接连接，再通过配置路由规则，可以实现在服务器上使用异地数据中心的IP 地址，并在应用上呈现出一些特点。

Servers usually use IP addresses of the data center. In order to realize some special functions, sometimes it’s necessary that the server uses IP address of remote data center. But the internet architecture makes it difficult to achieve. To build a tunnel on the internet using VPN technology, the server and the remote data center will be directly connected in the network layer. Then through the configuration of the routing rules, the server using the IP address of remote data center can be realized. Some characteristics in application will also be presented.