Virtual IP address

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A virtual IP address (VIP or VIPA) is an IP address assigned to multiple applications residing on a single server, multiple domain names, or multiple servers, rather than being assigned to a specific single server or network interface card (NIC). Incoming data packets are sent to the VIP address which are routed to actual network interfaces.

A server IP address depends on the MAC address of the attached NIC. However, VIP addressing enables hosting for several different applications and virtual appliances on a server with only one logical IP address.

VIPs have several variations and implementation scenarios, including Common Address Redundancy Protocol (CARP) and Proxy Address Resolution Protocol (Proxy ARP).

Usage[edit]

VIPs are mostly used to consolidate resources through the allocation of one network interface per hosted application.

It is also used for connection redundancy by providing alternative fail-over options on one machine; a VIP address may still be available if a computer or NIC fails, because an alternative computer or NIC replies to connections.[1]

See also[edit]

References[edit]

  1. ^ What is virtual IP address? - A Word Definition From the Webopedia Computer Dictionary