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Re: MLD snooping of solicted-node multicast (Was: Re: New Version Notification for draft-halpern-6man-nd-pre-resolve-addr-00.txt

Lorenzo Colitti <lorenzo@google.com> Fri, 17 January 2014 19:37 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Fri, 17 Jan 2014 11:36:44 -0800
Message-ID: <CAKD1Yr0cV1R9WzR0rHgC9A80vaQ+GDdtZ0aKOQdxfrhALULd4Q@mail.gmail.com>
Subject: Re: MLD snooping of solicted-node multicast (Was: Re: New Version Notification for draft-halpern-6man-nd-pre-resolve-addr-00.txt
To: Dmitry Anipko <Dmitry.Anipko@microsoft.com>
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Cc: 6man WG <ipv6@ietf.org>, Ing-Wher Chen <ing-wher.chen@ericsson.com>
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On Fri, Jan 17, 2014 at 11:14 AM, Dmitry Anipko <Dmitry.Anipko@microsoft.com
> wrote:

>  >>A more precise statement would be that the number of solicited-node
> groups scales linearly with the number of IPv6 addresses assigned to hosts,
>
> Agreed. And generally, number of addresses can be more than 2-3 (because
> of multiple prefixes, and because of multiple suffixes due to privacy
> extensions).
>
Indeed. But in the common case of a wifi network where devices come and go
frequently, you'll typically have only a link-local, a global, and one
temporary address. If you use EUI-64 the link-local and the global will be
on the same group.


>  We have recently seen issues in some APs, where they were not able to
> handle multiple addresses per host, because of some state maintained per
> host (that's not a justification that host should not have multiple
> addresses, but I just wanted to note that today there are issues in some
> cases related to that).
>
We should clarify that such behaviour is broken and that saying, "it works
in IPv4, so we should just use DHCPv6 for address assignment so that we can
force the host to have only one address" is not a solution.

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