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Re: [v6ops] RFC6459 "IPv6 in 3GPP" - the IID in the LL address and GUA

Alexandre Petrescu <alexandre.petrescu@gmail.com> Wed, 12 July 2017 15:15 UTC

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To: 神明達哉 <jinmei@wide.ad.jp>
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From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Subject: Re: [v6ops] RFC6459 "IPv6 in 3GPP" - the IID in the LL address and GUA
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Le 12/07/2017 à 16:58, 神明達哉 a écrit :
> At Wed, 12 Jul 2017 13:41:39 +0200,
> Alexandre Petrescu <alexandre.petrescu@gmail.com> wrote:
> 
>>> == The GGSN shall not generate any globally unique IPv6 addresses for
>>> itself using the Prefix assigned to the MS in the Router
>>> Advertisement. ==
>>
>> I think that spec is wrong (3GPP TS. 29.061?).
>>
>> Because, in practice some operator on some APN puts a GUA (not an LLA)
>> on its router's interface towards the UE.  It uses that GUA in the src
>> of the RA sent to the UE.  Packet dump available upon request.
> 
> I have no expertise in the 3GPP spec, but if I understand the above
> correctly it's broken even more fundamentally: the source address
> of an RA MUST be a link-local address.
> 
> 4.2.  Router Advertisement Message Format
> [...]
>        Source Address
>                       MUST be the link-local address assigned to the
>                       interface from which this message is sent.
> (from RFC4861)
> 
> If you really see an RA with a non-LL source address, a textual
> snippet of the packet dump will certainly be interesting.

A textual snippet may include addresses that are considered private. 
But I will send you privately the snippet.

Alex

> 
> --
> JINMEI, Tatuya
>

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