Re: draft-ietf-6man-rfc4941bis-01

[Fernando Gont <[e-mail]>]

Hi, Bernie,

On 25/3/19 09:45, Bernie Volz (volz) wrote:
> Fernando:
> 
> Please update reference for DHCPv6 from RFC3315 to RFC8415 in next
> revision. There may need to be updates to reference appropriate new
> section numbers.

Will do. Thanks!


> Regarding:
> 
> “One way to avoid having a stable non-changing address is to use DHCPv6
> [RFC3315 <https://tools.ietf.org/html/rfc3315>] for obtaining addresses.
> Section 12 of [RFC3315] <https://tools.ietf.org/html/rfc3315#section-12>
> discusses the use of DHCPv6 for the assignment and management of
> "temporary addresses", which are never renewed and provide the same
> property of temporary addresses described in this document with regards
> to the privacy concern.”
> 
> 
> They can be renewed; typically they would not be but they can be. For
> example, may be needed if existing connection using the temporary
> address as source needs to be maintained. Section 13.2 states:
> 
> 
> “One of the most important properties of a temporary address is to make
> it difficult to link the address to different actions over time. So, it
> is NOT RECOMMENDED for a client to renew temporary addresses, though
> DHCP provides for such a possibility (see Section 21.5
> <https://tools.ietf.org/html/rfc8415#section-21.5>).”

How about updating the aforementioned text as follows:

 “One way to avoid having a stable non-changing address is to use DHCPv6
 [RFC8415] for obtaining addresses.  Section 13.2 of [RFC8415]
 discusses the use of DHCPv6 for the assignment and management of
 "temporary addresses", that can provide the same property of temporary
  addresses described in this document with regards to the privacy concern.”

?

P.S.: I'm not sure whether a DHCPv6 server might impose limits on the
number of temporary addresses that may be leased to a client,.. in which
case SLAAC would be a better option from a privacy point of view.

Thanks!

Cheers,
-- 
Fernando Gont
SI6 Networks
e-mail: [e-mail]
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