Re: Objection to draft-ietf-6man-rfc4291bis-07.txt

Alexandre Petrescu <alexandre.petrescu@gmail.com> Wed, 01 March 2017 19:47 UTC

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Subject: Re: Objection to draft-ietf-6man-rfc4291bis-07.txt
To: =?UTF-8?Q?Dan_L=c3=bcdtke?= <mail@danrl.com>
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From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Date: Wed, 1 Mar 2017 20:47:51 +0100
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Le 01/03/2017 à 12:23, Dan Lüdtke a écrit :
>
>> On 28 Feb 2017, at 13:04, Alexandre Petrescu <alexandre.petrescu@gmail.com>; wrote:
>>
>> Finally, there is no advice of what bits to put between fe80:: and a
>> 64bit the Interface ID - zeros or ones?  linux says it's a fe80::/64 and
>> IIRC BSD says it's a fe80::/10.  The routing entries based on that can
>> make for interop problems.
>
> I think there is advice. As I understand, /10 is reserved but only /64 is specified.

Sorry, I dont understand that?

What is the difference?  Why reserving X if only specifying Y?  What 
other concept is similar: is there some other number which is reserved 
and only number+1 is specified?

Why couldnt we just reserve without specifying?  Or specifying without 
reserving?

If we continue with reserving _and_ specifying we continue wasting these 
54bits there.

What are these 54bits for?

Alex

>
>
> RFC 4291 IP Version 6 Addressing Architecture
>   2.5.6.  Link-Local IPv6 Unicast Addresses
>
>      Link-Local addresses are for use on a single link.  Link-Local
>      addresses have the following format:
>
>      |   10     |
>      |  bits    |         54 bits         |          64 bits           |
>      +----------+-------------------------+----------------------------+
>      |1111111010|           0             |       interface ID         |
>      +----------+-------------------------+----------------------------+
>
>
> Cheers,
>
> Dan
>