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Re: I-D Action: draft-mishra-6man-variable-slaac-01.txt

Alexandre Petrescu <alexandre.petrescu@gmail.com> Mon, 09 November 2020 09:34 UTC

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Subject: Re: I-D Action: draft-mishra-6man-variable-slaac-01.txt
To: Brian E Carpenter <brian.e.carpenter@gmail.com>, Ca By <cb.list6@gmail.com>, otroan@employees.org
Cc: draft-mishra-6man-variable-slaac@ietf.org, Lorenzo Colitti <lorenzo=40google.com@dmarc.ietf.org>, 6man WG <ipv6@ietf.org>
References: <160409741426.1448.16934303750885888002@ietfa.amsl.com> <3c1c3ab5-5726-b141-e7ed-618984bbbdb1@gmail.com> <CABNhwV1zoZpZNjb54rEys4+49H3vpebZW2g9JbO1_58eR+WnQg@mail.gmail.com> <CAKD1Yr0vvyQnTGRoSh4qa4He1gq5HXXRaKU3pVLtCtDUzcwL_w@mail.gmail.com> <CAD6AjGQPatbg5=OaMzxJXy5mGZai1bqLfg8f+9SUnfg=s1kADg@mail.gmail.com> <FE260932-A064-493E-8CD5-D92B2725F9E6@employees.org> <CAD6AjGRXYqJhXL6ipbS_cWkE2mg3sU4tM5XCCvgiGvSALGfeeg@mail.gmail.com> <e7938c0f-758c-1f90-814a-46f8b262a134@gmail.com>
From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Date: Mon, 09 Nov 2020 10:34:38 +0100
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Le 09/11/2020 à 02:25, Brian E Carpenter a écrit :
> On 09-Nov-20 13:00, Ca By wrote:
>> 
>> 
>> On Fri, Nov 6, 2020 at 1:05 AM <otroan@employees.org 
>> <mailto:otroan@employees.org>> wrote:
[...]
> Just handing out a /56 to each PDP context would be so much better.

Sounds reasonable because a /56 is so much space, and can make several /64s.

But still, it would not be enough.  How would the smartphone form an
IPv6 address when receiving a /56 in the RA?  There is no spec that
tells it how to, because the IID must be 64bit and the smartphone would
not know how to pad the remaining 8 bits.

At that point the operator might want to put a /64 in an RA and also
respond to DHCPv6-PD with a /56 inside.  It would be a double address
architecture effort.

This is why I am wondering how would one think the smartphone would be
happy enough when receiving a /56 in a DHCPv6 advertisement.

Alex

> 
> Brian
> 
>> 
>> None of that exists today in mobile. I feel the effort and scale 
>> are daunting, so i am not going to do it.
>> 
>> But, getting a knob in the gateway to set the RA to be 60 (or 
>> other) instead of 64 would be easy. And, that knob could be 
>> constrained to only compatible device type (chef’s kisses!)... it 
>> can be done
>> 
>> 
>> 
>> Best regards, Ole
>> 
>> 
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