Re: 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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