Re: Objection to draft-ietf-6man-rfc4291bis-07.txt - /63 and /65 RAs on linux

Erik Kline <ek@google.com> Thu, 02 March 2017 08:23 UTC

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From: Erik Kline <ek@google.com>
Date: Thu, 2 Mar 2017 17:14:54 +0900
Message-ID: <CAAedzxrSTFe0GgYuvtXPNE=R_ZCXotxL7HbKdj5A4-869rncmw@mail.gmail.com>
Subject: Re: Objection to draft-ietf-6man-rfc4291bis-07.txt - /63 and /65 RAs on linux
To: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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On 2 March 2017 at 17:11, Alexandre Petrescu <alexandre.petrescu@gmail.com>;
wrote:

>
>
> Le 01/03/2017 à 20:53, Mikael Abrahamsson a écrit :
>
>> On Wed, 1 Mar 2017, Alexandre Petrescu wrote:
>>
>> For information, today on linux a /65 RA is called "illegal" and a
>>> /63 RA makes a Host to _not_ configure an address.  What linux
>>> wants is a 64 and nothing else.  This is not normal, and it's not
>>> programmer's fault.
>>>
>>
>> Could you please elaborate on the last sentence. What do you mean by
>> "not normal"?
>>
>
> It is not normal for linux kernel to complain about a plen==65 in the RA
> - it should not complain.  Do you think it is normal?
>
> It is not normal for a linux kernel to _not_ form an IPv6 address when
> it receives a plen==63.  It would have been normal to append the IID to
> it.  Do you think it is abnormal for a linux kernel to form an IPv6
> address when it receives a plen==63?
>


These statements have zero basis in fact.  The Linux kernel is behaving
according to all currently available (proposed) standards.