Virtual IP Technology-VIP

1. Virtual IP Technology, abbreviated vip,virtual IP.

2. Virtual IP principle

We know that the general IP address is tied to the physical network card, and the VIP is the opposite of the actual network card is not bound to the IP address. When the external network of a machine, through the domain name access to a company intranet resources, intranet DNS server will be resolved to a VIP domain name. When the external network host through the domain name resolution to get this VIP, the packet will be sent to this VIP. But in the intranet, this VIP is not connected with the specific equipment, so the destination address of the network sent over is the VIP IP packet, which machine will go to.

In fact, this process is in the net, through the ARP protocol to complete. This means that the VIP can be mapped to the MAC address can be controlled. VIP in the network is dynamically mapped to a different MAC address, that is, mapping to different machine equipment, then can play the effect of load balance.

The concept of PS:VIP is a concept in LVS, specifically learning Linux load Balancing software LVS concept Chapter http://blog.csdn.net/wangjianno2/article/details/21291209

Reference url:http://blog.csdn.net/whycold/article/details/11898249