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

Alexandre Petrescu <alexandre.petrescu@gmail.com> Thu, 02 March 2017 11:06 UTC

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Subject: Re: Objection to draft-ietf-6man-rfc4291bis-07.txt - /63 and /65 RAs on linux
To: Mikael Abrahamsson <swmike@swm.pp.se>
References: <20170223134026.GI5069@gir.theapt.org> <CAN-Dau0n6oFm538XdJOcuO1yg92BCDD3mBu5YfBVm_+g-gtcKA@mail.gmail.com> <CAL9jLaYO=uYgVfSZ0SoSe0SujJ1xgwEKE8WLzo_keJHywgXTtg@mail.gmail.com> <CAN-Dau1vJV5O_Ythp6THkAu4-YZXV82Upny1V+ybbjCVZQQX=A@mail.gmail.com> <27cce319-18ac-5c0e-3497-af92344f0062@gmail.com> <de4988be-6031-08d9-84ce-21c3fa4f9bc9@gmail.com> <98401ef7-cf41-b4a0-4d11-a7d840181bd0@gmail.com> <1047f5fc-ae40-be52-6bab-27f31fe5e045@gmail.com> <9a94feac-8d59-b153-d41c-04fc371e4db4@gmail.com> <CAO42Z2z7v4gDk91b6Of-1sczV88m3B9kzn0MeJU_VBJ416k6Ww@mail.gmail.com> <ae35b45a-0398-840f-fc0d-1f64dd2fcc58@gmail.com> <37851ee3-03be-8bee-6190-f4d28df86305@gmail.com> <alpine.DEB.2.02.1703012051590.30226@uplift.swm.pp.se> <b5784622-c24e-a531-4e68-249b03701941@gmail.com> <CAAedzxrSTFe0GgYuvtXPNE=R_ZCXotxL7HbKdj5A4-869rncmw@mail.gmail.com> <ba025be6-709d-87b4-f388-d6f143408277@gmail.com> <alpine.DEB.2.02.1703021029010.30226@uplift.swm.pp.se>
From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Date: Thu, 02 Mar 2017 12:06:41 +0100
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Cc: Erik Kline <ek@google.com>, IETF IPv6 Mailing List <ipv6@ietf.org>
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Le 02/03/2017 à 10:31, Mikael Abrahamsson a écrit :
> On Thu, 2 Mar 2017, Alexandre Petrescu wrote:
>
>> perfectly fine to use that plen==65 to have an entry in the rt
>> table, and use a manually configured address in that plen.
>
> Linux does the right thing in not autoconfiguring itself address(es)
> when plen isn't 64.

Whereas it is the right thing if on Ethernet (RFC2464) it is wrong on 
cellular links for which we have no RFC IPv6-over-foo.  Same with USB 
and to a certain extent on WiFi.

> However, what does it do when it receives an PIO with plen of 65 and
> M=1 and then it gets an IA_NA and configures that on the interface?

I dont know.  But I guess it still calls that 65 plen "illegal".

> Doesn't it install the /65 in the routing table?

Dont know, but there is a need to check.

How about the /63 case?  Do you think it is normal that linux kernel 
does not configure an IP address on Ethernet when receiving a plen==63?

Alex

>

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