(In an environment of multiple service injuries in China, When the north and South are not interconnected, is there a new technology for webmasters of some websites? That is, the website has multiple lines connected to telecom Netcom Germany multi service providers at the same time, and then the same domain name client access will resolve different domain names according to the IP address of the client, so as to achieve network optimization? This document is how to realize it in the real environment. It can be used after being configured according to this document of)