I can see that the world is against me here ;-) , but I am not sure that
giving in quietly is actually the right answer in this case!
If you are offering alternatives, it is a legitimate question to ask
whether all nodes in some context have to use the same alternative to
achieve interoperability - we know that they don't have to and can say
so in one short sentence!
Brian Haberman wrote:
On Jul 12, 2005, at 3:49, Elwyn Davies wrote:
I was thinking of something along the lines of:
...joining and leaving the solicited-node multicast group SHOULD be
done using MLD v1 [MLD] or v2 {RFC3810]. Section 8 of [RFC3810]
explains how nodes using MLDv1 and MLDv2 can coexist on a link.
Two things with this suggestion. First, the above text may be seen as a
Normative reference to RFC 3810. That won't work for 2461bis given that
3810 is PS.
I have to say that this would be a rather hair splitting view, but you
may well be right - I am not sure that saying you SHOULD use something
is not normative but that pointing someone to a section of the document
in case they do use it makes it normative.
The second issue is that I still don't see the benefit of adding
operational guidelines for MLD in this spec. I agree with Hesham that it
belongs somewhere and that somewhere is section 8 of RFC 3810.
or maybe in node requirements? Anyway is this really an operational
guideline? I am not proposing you say what to do but rather that we
*have* thought about it and 3810 has the answer.
If someone recognizes that they are mixing MLD versions, then I would
hope/expect that they are aware of the guidelines in 3810 already before
they get to any issues in 2461bis. To me, it would be similar to having
text providing hints on interoperability between DHCPv6 and DHCPv6-lite
(as an example).
It seems to me that there is a difference here: whether or not 2461bis
says SHOULD use MLD all the routers around appear to implement MLD and
(AFAIK) turn it on by default. People endeavouring to use IPv6 for
unicast who are not interested in multicast may know little or nothing,
and care less about MLD (sorry). People who are using DHCP are making a
poitive choice for it.
However, be that as it may, router vendors are going to have to point
this issue out to their clients, and they need to be reminded to do so
by some means.
Enough of this - Just make sure it doesn't get lost down the cracks!
Regards,
Elwyn
Regards,
Brian
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