Re: [dhcwg] I-D Action: draft-ietf-dhc-rfc3315bis-09.txt - questions about Solicit Prefix Delegation - src LL vs GUA

神明達哉 <jinmei@wide.ad.jp> Wed, 18 October 2017 17:57 UTC

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To: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Subject: Re: [dhcwg] I-D Action: draft-ietf-dhc-rfc3315bis-09.txt - questions about Solicit Prefix Delegation - src LL vs GUA
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At Wed, 18 Oct 2017 19:42:16 +0200,
Alexandre Petrescu <alexandre.petrescu@gmail.com> wrote:

> >        *  If the server receives the message directly from the client and
> >           the source address in the IP datagram in which the message was
> >           received is a link-local address, then the client is on the
> >           same link to which the interface over which the message was
> >           received is attached.

> That is useful guidance if the question was about on which link this
> Client was.  In my case the link involves GTP, UDPv4 and IPv6.
>
> But I need guidance to the following question: if the Client sends a
> Solicit with a LL in src, MUST the Server reply to it?  (yes/no is the
> needed guidance).

I don't see the need for such guidance, at least as part of
rfc3315bis.  What's your problem if we didn't have such guidance in
normative text like a "MUST"?

> I explain why: about 4 distinct clients use LL in src.  If I want these
> clients to use GUA then I must delete the LL from the interface.

This one itself doesn't sound like a problem.  Do you have any
specific problem with the clients sending a solicit from a link-local
address?

--
jinmei