Re: IPv6 w.g. Last Call on "Unique Local IPv6 Unicast Addresses"

[Hans Kruse <kruse@ohio.edu>]

Some notes on the draft as well as some of the comments on the list:

1.  I think this draft is appropriately being prepared as Proposed 
Standard.  Trying to side-line local addressing to Experimental is not in 
keeping with the declared consensus on work towards a "replacement for 
site-locals" (which after all are on the standards track now).  Also, this 
document IMHO can be tweaked in pretty short order to qualify for Proposed 
Standard status.

2.  Several folks stumbled over the wording (in section 1.0) that 
"applications may treat these address[sic] like global scoped addresses". 
How about:

"Applications may treat these addresses like global scoped addresses; such 
applications will function correctly within the reach of the local 
addresses.  Sites using a mixture of Globally Routable and Local addresses 
may experience sub-optimal application behaviour, see sections 8.0-10.0 for 
further discussion".

If that sounds better I am willing to volunteer wording/edits to tighten up 
those sections (regarding applications in mixed environments).

3.  Section 9.0 regarding DHCP6; suggest: "In order for hosts to 
autoconfigure Local IPv6 addresses, routers have to be configured to 
advertise Local IPv6 /64 prefixes in router advertisements, or DHCP6 must 
have been configured to assign them."

4.  Regarding DNS; there were some comments regarding RFC1918-style 
lookups.  I assume the concern was regarding reverse lookups (the 1918 root 
server load issue).  However, the Local addresses in this draft are unique 
(FC00::/8) or nearly unique (FD00::/8).  As such there is really no reason 
not to allow reverse lookups for FC00::/8 in the global DNS.


Hans Kruse, Associate Professor
J. Warren McClure School of Communication Systems Management
Adjunct Associate Professor of Electrical Engineering and Computer Science
Ohio University, Athens, OH, 45701
740-593-4891 voice, 740-593-4889 fax

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