Re: ULA scope [draft-ietf-6man-rfc3484-revise-05.txt]

Kerry Lynn <kerlyn@ieee.org> Sat, 17 March 2012 17:02 UTC

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Date: Sat, 17 Mar 2012 13:02:06 -0400
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Subject: Re: ULA scope [draft-ietf-6man-rfc3484-revise-05.txt]
From: Kerry Lynn <kerlyn@ieee.org>
To: 6man <ipv6@ietf.org>, "homenet@ietf.org Group" <homenet@ietf.org>
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On Sat, Mar 17, 2012 at 2:22 AM, Dave Thaler <dthaler@microsoft.com> wrote:
> Brian Carpenter writes:
> [...]
>> Let me be clear. If a local service has (for some reason) both a ULA and a non-
>> ULA global address, and the host has both, I think the correct default
>> behaviour is for the ULA address pair to be used.
>
> As I put into the doc, I don't think that's quite right.
>
> If both the source and dest ULAs are in the same /48 then I think the correct
> default is as you say (use ULA).
>
> If the source and dest ULAs are in different /48's then I think the correct
> default is instead to use the non-ULA global, since there's no guarantee of
> routability between different /48s.  So unless configured otherwise, one
> has to assume it's far more problematic than a non-ULA global.
>
Do you mean "no guarantee of symmetric routability"?  The fact that the
packet arrived in the first place seems to indicate earlier policy choices
(e.g. the sender may not have a non-ULA global address, and the two /48s
already seem to share a common definition of "site").

I am still relatively new to homenet and I am surely missing a lot of
background.  Has anyone discussed dealing with multiple /48 ULA
prefixes in a single site?

Thanks, -K-

> You'll find the above logic in the current 3484bis draft.
>
> -Dave
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