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Re: [v6ops] A proposal for draft-ietf-6man-rfc4291bis-07 - FE80:: means FE80::/9

Mark Smith <markzzzsmith@gmail.com> Wed, 08 March 2017 05:26 UTC

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From: Mark Smith <markzzzsmith@gmail.com>
Date: Wed, 08 Mar 2017 16:26:08 +1100
Message-ID: <CAO42Z2yFuuAuEb5=mb8Jwge21nahDhy1uPq-6j7YGnTF9=uM9g@mail.gmail.com>
Subject: Re: [v6ops] A proposal for draft-ietf-6man-rfc4291bis-07 - FE80:: means FE80::/9
To: Ole Troan <otroan@employees.org>
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Cc: Alexandre Petrescu <alexandre.petrescu@gmail.com>, 6man WG <ipv6@ietf.org>
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On 8 Mar. 2017 8:34 am, <otroan@employees.org> wrote:

> Thanks to this discussion, I would like to promote the following fact
that I did not know:
>
> If you say "FE80::" without telling the prefix length, that actually
means "FE80::/9" (and not FE80::/10, nor FE80::/64).  Because 0xFE80  is
"1111 1110 1000 0000" in binary representation.

No it doesn't.

FE80:: means FE80:0000:0000:0000:0000:0000:0000:0000



Or

FE80:0000:0000:0000:0000:0000:0000:0000/128

which is an address within the LL space.

Possible a statement that a /128 is implied if no prefix length is stated,
and is the definition of an "address", could be put in RFC4291bis during
AUTH48? Is it a trivial enough change (I think it probably isn't, although
it'd be a bit of a shame to have to wait until the next RFC revision of it.)

Regards,
Mark.





Cheers,
Ole


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