Re: RFC6085 update to rfc2464bis

[Bob Hinden <[e-mail]>]

Jinmei-san,

> On Jan 10, 2017, at 9:26 AM, 神明達哉 <[e-mail]> wrote:
> 
> At Mon, 9 Jan 2017 13:53:54 -0800,
> Bob Hinden <[e-mail]> wrote:
> 
>>> 7.  Address Mapping -- Multicast
>>> 
>>>   An IPv6 packet with a multicast destination address DST, consisting
>>>   of the sixteen octets DST[1] through DST[16], is transmitted to the
>>>   Ethernet multicast address whose first two octets are the value 3333
>>>   hexadecimal and whose last four octets are the last four octets of
>>>   DST.
>>> 
>>>                  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>                  |0 0 1 1 0 0 1 1|0 0 1 1 0 0 1 1|
>>>                  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>                  |   DST[13]     |   DST[14]     |
>>>                  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>>                  |   DST[15]     |   DST[16]     |
>>>                  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>> 
>>   An IPv6 multicast packet may also be mapped to a unicast Ethernet
>>   Link layer address as defined in Section 6.
> 
> I think it's more helpful to refer to RFC6085 explicitly here.
> Otherwise the proposed text looks good to me.

RFC6085 doesn’t actually say very much.  The only real content in Section 3:

   3.  Receiving IPv6 Multicast Packets

   An IPv6 node receiving an IPv6 packet with a multicast destination
   address and an Ethernet link-layer unicast address MUST NOT drop the
   packet as a result of the use of this form of address mapping.

There is some text in the Introduction that says more:

   This document
   extends this mapping to explicitly allow for a mapping of an IPv6
   packet with a multicast destination address into an Ethernet link-
   layer unicast address, when it is clear that only one address is
   relevant.

Unfortunately, there isn’t anything like that in the main part of the document.

I will add an informational reference to RFC6085, but I don’t think it helps very much.

Thanks,
Bob





> 


>>   An IPv6 node receiving an IPv6 packet with a multicast destination
>>   address and an Ethernet link-layer unicast address must not drop the
>>   packet as a result using of this form of address mapping.
> 
> --
> JINMEI, Tatuya
> 
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