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IBM z/OS V2R1 Communications Server TCP/IP Implementation Volume 3: High Availability, Scalability, and Performance by Maulide Xavier, Rutsakon Techo, Georg Senfleben, Micky Reichenberg, Gilson Cesar de Oliveira, Uma Maheswari Kumaraguru, Rufus P. Credle Jr.

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Virtual IP addressing
In TCP/IP networking, Internet Protocol (IP) addresses are typically assigned to physical network interfaces. If a server has two physical interfaces, a separate IP address is assigned to each of them.
IBM introduced the concept of virtual IP addressing (VIPA) for its z/OS environment to support the use of IP addresses, representing TCP/IP stacks, applications, or clusters of applications, that are not tied to any specific ...

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