ULAs in draft-arifumi-6man-rfc3484-revise-01

Brian E Carpenter <brian.e.carpenter@gmail.com> Mon, 22 June 2009 10:01 UTC

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Date: Mon, 22 Jun 2009 11:01:14 +0100
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Subject: ULAs in draft-arifumi-6man-rfc3484-revise-01
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Hi,

Section 2.3 of draft-arifumi-6man-rfc3484-revise-01 says:

> 2.3.  To change ULA address scope to site-local
> 
>    RFC 5220 Section 2.1.4, 2.2.2, and 2.2.3 describes address selection
>    problems related to ULA.  These problems can be solved by changing
>    the scope of ULA to site-local.

This change will also create a new problem, for sites that configure a
VPN to another partner site using ULAs on both sites, so that ULA-to-ULA
traffic can use the VPN. In this case ULA=global and longest match may
well be the correct choice. If we change to ULA=site-local, then there
must be a note that sites wishing to use ULAs for VPN communications
will need to configure local 3484bis policy accordingly. (This is
really the inverse of what is stated in RFC 5220.)

   Brian