I-D ACTION:draft-stevens-advanced-api-01.txt

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       Title     : Advanced Sockets API for IPv6                           
       Author(s) : W. Stevens, M. Thomas
       Filename  : draft-stevens-advanced-api-01.txt
       Pages     : 62
       Date      : 02/17/1997

Specifications are in progress for changes to the sockets API to support IP
version 6 [2].  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 [2]: 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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