z/OS V2R1 supports IPv4 INTERFACE definitions for HiperSockets and Static VIPA in addition to the prior support for OSA-Express QDIO. The IPv4 INTERFACE statement combines the function of DEVICE/LINK/HOME into a single statement. This simplifies your stack configuration and also improves the usability of dynamically adding or removing these interfaces from your TCP/IP profile (which can be cumbersome when the HOME statement is involved). If you use the source VIPA function, the INTERFACE statement makes it much easier to designate which VIPA to use for the source IP address (without needing to manage the order of VIPAs in the HOME list). For the syntax of these statements, see the V2R1 IP Configuration Reference.