Re: ipv6 multicast address

John Cruz (johcruz) ??:
> Hi,
> 
> According to RFC 3307, a reserved multicast address should be of the
> format FF02::<GROUPID-32bits>. This is what is indicated in the VRRP
> draft. The Xs don't refer to a block.
> 
> Moreover, this statement is under the "IANA Considerations". It is for
> IANA to assign this address. To the best of my knowledge, this will be
> the
> address assigned by IANA. But I don't know when it will be assigned
> though.
> 
> Hope this helps.

Yes that makes sense. Thanks for the explanation!

> John
> 
>> -----Original Message-----
>> From: [email protected] [mailto:[email protected]]
>> Sent: Wednesday, August 20, 2008 8:25 PM
>> To: John Cruz (johcruz)
>> Cc: [email protected]
>> Subject: Re: [VRRP] ipv6 multicast address
>>
>> John Cruz (johcruz) wrote:
>>> Please see Section 13. The address to be used is FF02::12.
>> Thanks John. But this is only a "convenient assignment". Although I
>> guess most implementation will just use ff02::12 for sending, it's
>> possible that someone will send to ff02::13 or sth else.
>>
>> So why a block of addresses (not a single address instead) was
> assigned
>> for VRRP in the first place?
>>
>>> John
>>>
>>> 13.  IANA Considerations
>>>
>>>    VRRP for IPv6 needs an IPv6 link-local scope multicast address
>>>    assigned by the IANA for this specification.  The IPv6 multicast
>>>    address should be of the following form:
>>>
>>>       FF02:0:0:0:0:0:XXXX:XXXX
>>>
>>>    The values assigned address should be entered into section
>> 5.1.2.2.
>>>    A convenient assignment of this link-local scope multicast would
>> be:
>>>       FF02:0:0:0:0:0:0:12
>>>
>>>
>>>
>>>> -----Original Message-----
>>>> From: [email protected] [mailto:[email protected]] On
> Behalf
>>> Of
>>>> Huafeng Lu
>>>> Sent: Wednesday, August 20, 2008 2:26 AM
>>>> To: [email protected]
>>>> Subject: [VRRP] ipv6 multicast address
>>>>
>>>>
>>>> Hi,
>>>>
>>>> The following is stated in the draft:
>>>>
>>>> 5.1.2.2.  Destination Address
>>>>
>>>>    The IPv6 multicast address as assigned by the IANA for VRRP is:
>>>>
>>>>    FF02:0:0:0:0:0:XXXX:XXXX
>>>>
>>>>    This is a link-local scope multicast address.  Routers MUST NOT
>>>>    forward a datagram with this destination address regardless of
>> its
>>>>    Hop Limit.
>>>>
>>>>
>>>>
>>>> So the address is not fixed? A master virtual router can send adv
> to
>>>> any
>>>> addr in this range, and a backup virtual router has to join all
>>>> multicast groups within this range? This doesn't sounds quite clear
>> to
>>>> me.
>>>>
>>>> Can someone explain a bit to me? Thanks.
>>>> --
>>>> Huafeng
>>>> _______________________________________________
>>>> vrrp mailing list
>>>> [email protected]
>>>> https://www.ietf.org/mailman/listinfo/vrrp
> 

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