Title: Advanced Sockets API for IPv6
Author(s): W. Stevens, M. Thomas.
Status: INFORMATIONAL
Date: Feb 1998
Length: 152077
Obsoleted by: RFC3542
Specifications are in progress for changes to the sockets API to support IP version 6 [RFC2133]. These changes are for TCP and UDP- based applications and will support most end-user applications in use today: Telnet and FTP clients and servers, HTTP clients and servers, and the like.
But another class of applications exists that will also be run under IPv6. We call these "advanced" applications and today this includes programs such as Ping, Traceroute, routing daemons, multicast routing daemons, router discovery daemons, and the like. The API feature typically used by these programs that make them "advanced" is a raw socket to access ICMPv4, IGMPv4, or IPv4, along with some knowledge of the packet header formats used by these protocols. To provide portability for applications that use raw sockets under IPv6, some standardization is needed for the advanced API features.
There are other features of IPv6 that some applications will need to access: interface identification (specifying the outgoing interface and determining the incoming interface) and IPv6 extension headers that are not addressed in [RFC2133]: Hop-by-Hop options, Destination options, and the Routing header (source routing). This document provides API access to these features too.
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