软件水平

The de facto standard application program interface (API) for TCP/IP

applications is the "sockets" interface. Although this API was

developed for Unix in the early 1980s it has also been implemented on

a wide variety of non-Unix systems. TCP/IP applications written

using the sockets API have in the past enjoyed a high degree of

portability and we would like the same portability with IPv6

applications. But changes are required to the sockets API to support

IPv6 and this memo describes these changes. These include a new

socket address strUCture to carry IPv6 addresses, new address

conversion functions, and some new socket options. These extensions

are designed to provide Access to the basic IPv6 features required by

TCP and UDP applications, including multicasting, while introducing a

minimum of change into the system and providing complete

compatibility for existing IPv4 applications.

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