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RE: Metadata over IPv6

"Templin (US), Fred L" <Fred.L.Templin@boeing.com> Tue, 17 December 2019 17:33 UTC

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From: "Templin (US), Fred L" <Fred.L.Templin@boeing.com>
To: Brian Haley <haleyb.dev@gmail.com>, "ipv6@ietf.org" <ipv6@ietf.org>
Subject: RE: Metadata over IPv6
Thread-Topic: Metadata over IPv6
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Date: Tue, 17 Dec 2019 17:32:41 +0000
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References: <eee1ebe3-dd1a-1a5b-21a8-739857995abf@gmail.com> <3dd249916fbe47d1a8979591814e7846@boeing.com>
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> For embedded IPv4 addresses/prefixes, however, we would use a modified
> IPv4-compatible encapsulation as follows:
> 
>   fe80::ffff:a9fe:a9fe

I'm sorry; I intended to say "modified IPv4-mapped encapsulation". "IPv4-compatible"
is deprecated by RFC 4291 and would contain all-zero's instead of 0x0000ffff in bits 64-95.
AERO uses IPv4-mapped for embedded IPv4 addresses and all-zero's for administratively
assigned AERO addresses.

Also, fe80::ffff:a9fe:a9fe can be written as fe80::ffff:169.254.169.254 - the two address
representations are equivalent.

Thanks - Fred

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