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Re: Last Call: <draft-ietf-6man-rfc2460bis-08.txt> (Internet Protocol, Version 6 (IPv6) Specification) to Internet Standard

2017-02-27 04:01:05


Le 26/02/2017 à 14:24, Sander Steffann a écrit :

Op 26 feb. 2017, om 14:05 heeft Fernando Gont 
<fgont(_at_)si6networks(_dot_)com> het volgende geschreven:

On 02/26/2017 09:55 AM, Sander Steffann wrote:
Hi,

2.3.  Address Type Identification

 The type of an IPv6 address is identified by the high-order bits of
 the address, as follows:

    Address type         Binary prefix        IPv6 notation   Section
    ------------         -------------        -------------   -------
    Unspecified          00...0  (128 bits)   ::/128          2.4.2
    Loopback             00...1  (128 bits)   ::1/128         2.4.3
    Multicast            11111111             ff00::/8        2.6
    Link-Local unicast   1111111010           fe80::/10       2.4.6
    Global Unicast       (everything else)


I wonder if this table should explicitly call out ULAs, and provide a
reference to the corresponding section.

ULAs are not an address type, they are Global Unicast. Adding them here might 
confuse people. And if we include ULAs then there is lots more that we should 
include as well. So while I understand your question, I think it would be 
better not to.

The "confusing" part is that, while globally unique, their scope is not
really global -- i.e., they are not meant to be globally routable.

Indeed, globally unique vs globally routable. But if you go into this then it's 
more complicated than it seems. Whether something is routable and where are an 
operational choice. Companies choosing to interconnect might route each other's 
ULA space, while some of my RIPE NCC allocated space is not routed anywhere 
public. It's difficult to give a fixed definition that doesn't take operational 
stuff into account.

Of course the intention of how to use ULA should be mentioned somewhere, but 
probably not in this table.

Wasn't there at some point an I-D aiming to clarify what "global" meant?
-- IIRC, authored by Brian et al.

Sorry, I don't remember.

It was something to correct at IANA about this 'global'.

Alex


Cheers,
Sander


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