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

otroan@employees.org Wed, 08 March 2017 07:36 UTC

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Subject: Re: [v6ops] A proposal for draft-ietf-6man-rfc4291bis-07 - FE80:: means FE80::/9
Date: Wed, 08 Mar 2017 08:36:13 +0100
In-Reply-To: <CAO42Z2yFuuAuEb5=mb8Jwge21nahDhy1uPq-6j7YGnTF9=uM9g@mail.gmail.com>
To: Mark Smith <markzzzsmith@gmail.com>
References: <CAN-Dau17q_BrUuzfvB1mLDt6p5UxYikphWaHpa8VQ2L-3kx-DA@mail.gmail.com> <m1cjviu-0000EYC@stereo.hq.phicoh.net> <5BC57F0E-50FD-4452-853F-A08291C91EB1@google.com> <m1ck5mu-0000GaC@stereo.hq.phicoh.net> <5B4AFF50-8CA9-4134-8CE2-A383DB5F8BF5@google.com> <m1ckxfo-0000IMC@stereo.hq.phicoh.net> <225F639E-27C1-4408-BC2B-26500929049B@google.com> <CAOSSMjUR203+hYFBrFBrj9Xkjux3o7fYNd4y9kNyxwpLxF11ew@mail.gmail.com> <6D825351-7F43-4540-89AB-48DC2B5E92E3@google.com> <CAOSSMjUP6m-L1iNhE=BxHW+7hvt4YsZgxxtVn+qmgEVS9HeStA@mail.gmail.com> <CAJE_bqfpE-NWwG12S4CXM+ZnHdHHH31-y+_+pYhuCuq2FtqZ4w@mail.gmail.com> <7A10E8D9-02F4-4D1C-B422-86ACCAABCB38@steffann.nl> <1F674D50-1C89-444C-A617-C528951F80EC@steffann.nl> <6f2b4f35-8501-f9d8-e2f6-9e545419fb76@gmail.com> <a11c6b9b-ae5c-7c7d-a71c-cc5d8b80d047@gmail.com> <C689991E-A54D-41FB-BDE6-2BFA74B10049@employees.org> <CAO42Z2xKxe24+d_reyY1rTitA9oPy0=2QSTGSN65t5wFGx51uA@mail.gmail.com> <CAO42Z2yFuuAuEb5=mb8Jwge21nahDhy1uPq-6j7YGnTF9=uM9g@mail.gmail.com>
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Cc: Alexandre Petrescu <alexandre.petrescu@gmail.com>, 6man WG <ipv6@ietf.org>
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Mark,

> > 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.)

I don't see why it would be necessary to imply anything.
FE80:: is an address. Not a prefix. E.g. you wouldn't say the packet was sent from the source FE80::/128.

Cheers,
Ole

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