On 25/11/2016 09:37, Michael Richardson wrote:
...
>     >> 3.5.4.4: QUERY re: The relayed discovery message MUST have the same
>     >> Session ID as the incoming discovery message and MUST be tagged with
>     >> the IP address of its original initiator (see Section 3.8.4).
>     >>
>     >> I thought we were adding something about Link Local addresses here?
> 
>     > What was the point there? (Clearly, discovered link-local addresses
>     > MUST NOT be sent on to another interface, is that it? But that affects
>     > the Discovery Response process, not the relay process. Must check my
>     > code, too...)
> 
> I think that's the point.  Should we even relay discovery messages from LL
> origins?

In fact, this point is covered in the formal spec of the Locator Option. I 
propose
to augment it slightly thus:

<t>Note 1: The IPv6 address MUST normally have global scope. Exceptionally, 
during initialisation,
a link-local address MAY be used for specific objectives only (<xref 
target="secinst"/>). In this case
the corresponding Discovery Response message MUST be sent via the interface to 
which the link-local
address applies.</t>

<t>Note 2: A link-local IPv6 address MUST NOT be used when this option is 
included in a Divert option.</t>

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