I-D ACTION:draft-ietf-ipngwg-iid-00.txt

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A New Internet-Draft is available from the on-line Internet-Drafts 
directories. This draft is a work item of the IPNG Working Group of the 
IETF.                                                                      

       Title     : Identifying Interfaces in IPv6 link-local addresses     
       Author(s) : R. Elz
       Filename  : draft-ietf-ipngwg-iid-00.txt
       Pages     : 6
       Date      : 02/12/1996

This draft proposes a change to the way that IPv6 link local addresses are 
constructed, so that a node can guarantee that all of its link local 
addresses are unique within the node.  The current definition of a link 
local address, a well known prefix, some number of zero bits, and a link 
specific unique token, ensures that it will be unique on the link, which is
what is required for communications using those addresses over the link, 
but does not require uniqueness of the addresses within a node.  In some 
cases all of a nodes interfaces may share the same link local address.  
Even the possibility of this means that link local addresses, which may in 
some situations be the only addresses that exist, cannot be used for 
internal definition of interfaces, or other purposes within the node.  This
draft suggests a method by which nodes may overcome this problem, by 
redefining the bits between the prefix and the token to be available to be 
used by the node to cause the addresses to be unique.                      

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