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Re: [v6ops] draft-ietf-6man-rfc4291bis prohibiting non-/64 subnets

Alexandre PETRESCU <alexandre.petrescu@cea.fr> Fri, 24 February 2017 19:26 UTC

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Subject: Re: [v6ops] draft-ietf-6man-rfc4291bis prohibiting non-/64 subnets
To: Christopher Morrow <morrowc.lists@gmail.com>
References: <58AF313D.3020905@foobar.org> <CAO42Z2ymnLm9dUNL3doU9+vR0eMzGbr71HQybbibXq9rCObP3A@mail.gmail.com> <21A9AEAE-330D-47F3-88CA-FC845C71AED0@darou.fr> <CAKD1Yr2Q-AUEWQSXFPzjn73Q7dJhMpB2_iHb3wJTCGx4-==Bpg@mail.gmail.com> <DADB35F5-3CB6-4396-A99F-ECE13C3EFE44@darou.fr> <e89b23b0-b037-995e-fd66-335505ecee61@gmail.com> <CAL9jLaY6RzX6pGFFMcReADudt+ewVtNw_XUYp07_BAVKAp8+hQ@mail.gmail.com> <bd05771e-1b03-1ee7-2a4c-0a1fe69b8a14@gmail.com> <CAL9jLaZJR9YzkF-R9Gx6MWBoJG4cSvp0rovYQ_9BALLzbQGiPQ@mail.gmail.com> <c3e04aa1-40e1-551f-3821-b62732106e3d@gmail.com> <CAL9jLaZhAp3VWHBJh08XnFoFAHZ_69tQJyUVAXE_YP9ELaDhbA@mail.gmail.com> <e9edd389-9b84-21b0-644b-10cfc7ea7d4e@gmail.com> <CAL9jLaatbLHVrjwBh345G6F1jv+R+RtgOSvQdAACcRXRZnU1zQ@mail.gmail.com> <b7b7f6b0-4c53-3baf-320b-0f7e443040f0@gmail.com>
From: Alexandre PETRESCU <alexandre.petrescu@cea.fr>
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Date: Fri, 24 Feb 2017 20:26:20 +0100
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--
Alexandre Petrescu
alexandre.petrescu@cea.fr, tél 0169089223

Le 24/02/2017 à 19:36, Alexandre Petrescu a écrit :
>
>
> Le 24/02/2017 à 19:21, Christopher Morrow a écrit :
>>
>>
>> On Fri, Feb 24, 2017 at 1:08 PM, Alexandre Petrescu
>> <alexandre.petrescu@gmail.com <mailto:alexandre.petrescu@gmail.com>> 
>> wrote:
>>
>>
>>
>>     Le 24/02/2017 à 18:53, Christopher Morrow a écrit :
>>
>>
>>         yes, I think so.. for linux:
>>         $ sudo ip -6 addr add 2001:700:4::1 dev em1
>>
>>         gets me:
>>          inet6 2001:700:4::1/128 scope global
>>
>>
>>     That address is good, but how about the routing table?  Does it get
>>     an entry like 2001:700:4::/64?
>>
>>
>> $ ifconfig em1
>> <snip>
>>           inet6 addr: 2001:700:4::1/128 Scope:Global
>> <snip>
>>
>> and:
>> $ netstat -rnA inet6
>> Kernel IPv6 routing table
>> Destination                    Next Hop                   Flag Met Ref
>> Use If
>> 2001:700:4::1/128              ::                         U 256 0
>> 0 em1
>> <snip>
>> 2001:700:4::1/128              ::                         Un 0   1
>> 0 lo
>>
>> that sure seems like i only got what I paid for.. on:
>> $ uname -r
>> 3.13.0-92-generic
>
> Looks good in linux world.
>
> Alex

But, I would like to add that last time I checked (january 2015) the 
linux kernel complained in /var/log/messages  when receiving an RA 
containing a plen 65.  It called it "illegal" prefix length.
That RA was sent over usbnet.  There is no specification of 
IPv6-over-USB, there is no IID length requirement to be 64, because 
there is noo USB IEEE MAC address.

That was wrong at that time (call a 65 in RA "illegal"), I dont know 
whether it still the case.  I may check in some time in the following 
weeks, and this is the question I will follow: is the linux kernel 
complaining when receiving an RA with a plen 65 on usbnet?  If yes, then 
linux stilll has at least one problem with this 64.

What is sure is that there is still no IPv6-over-USB draft, so no IID 64 
on USB.

It's  a similar situation with cellular links instead of USB - no spec, 
but hidden assumptions about it being 64.  They are all wrong.

Alex

>
>>
>>

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