RE: [EXTERNAL] Re: Embedding IP information in an IPv6 address (OMNI)

"Templin (US), Fred L" <> Fri, 16 October 2020 16:31 UTC

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From: "Templin (US), Fred L" <>
To: Ted Hardie <>
CC: Philip Homburg <>, "" <>, "" <>
Subject: RE: [EXTERNAL] Re: Embedding IP information in an IPv6 address (OMNI)
Thread-Topic: [EXTERNAL] Re: Embedding IP information in an IPv6 address (OMNI)
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Date: Fri, 16 Oct 2020 16:31:21 +0000
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Ted, thanks for your input. We actually started with ULAs but were turned on to SLAs
by the notion that we would be making good use of an otherwise-wasted space. The
other thing to consider is that whatever ::/10 prefix we use, it will be dedicated for
use with operating the OMNI Adaptation Layer (OAL). If we were to use ULAs for
that, then the ULAs could not be used for any other purposes within the OMNI
domain. If we instead use SLAs, then we can still use ULAs for end system addressing.

So, yes, I think we want to allow for all three of LLAs, SLAs and ULAs to coexist
within an OMNI domain and to be used for their respective purposes. GUAs will
also naturally fit in where needed.

Thanks - Fred

From: Ted Hardie []
Sent: Friday, October 16, 2020 9:14 AM
To: Templin (US), Fred L <>
Cc: Philip Homburg <>om>;;
Subject: [EXTERNAL] Re: Embedding IP information in an IPv6 address (OMNI)

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Hi Fred

On Fri, Oct 16, 2020 at 9:04 AM Templin (US), Fred L <<>> wrote:
  don't want to call them "site-local" anymore; I want to rename them in
my draft as "segment-local".

> Of course, you can ask IANA to allocate a prefix for your particular purpose,
> and may be fec0:: but who knows. It seems bad to me to argue based on
> properties of a prefix you don't know you will get.

We can of course operate with any routable ::/10 prefix, and in fact the
draft called for ULAs until very recently until we were turned on to the
concept of re-purposing fec0::/10. It would be a good use of otherwise
wasted spaceo
Given the very large amount of space, I think re-using fec0:: is not really needed and probably not a good idea.  I think managing that would require first moving it from "deprecated" to "unallocated" then waiting a good long time for that to percolate through the industry's consciousness.  Only then would I think it safe to re-allocate.  It seems simpler to use ULAs (or ask for a new allocation, if you really believe that is necessary).

Just my opinion, of course.