Re: I-D Action: draft-fgont-6man-rfc4941bis-01.txt

[Fernando Gont <[e-mail]>]

On 03/26/2018 11:52 PM, Brian E Carpenter wrote:
>>>
>>>> 6. Temporary addresses are *not* disabled by default.
>>>
>>> Specifically, this text was removed:
>>>
>>>> Consequently, the use of temporary addresses SHOULD be disabled by	
>>>> default in order to minimize potential disruptions.
>>>
>>> My concern is that the disruptions ("some applications may not behave
>>> robustly if temporary addresses are used") haven't gone away, and the
>>> cause may be very hard for ordinary users to diagnose. In fact, I
>>> think some of the cases of help desks advising users to switch off
>>> IPv6 derive from recently shipped operating systems that enable
>>> temporary addresses by default. I've disabled them on a couple of
>>> Windows 10 laptops for this reason.
>>
>> Through what impact of using privacy addresses?  What are the problematic applications?
> 
> I don't know what the 4941 authors were thinking of. 

I guess they were referring to long-lived connections?


> The example
> I've seen is mentioned below: a service that considers frequent
> changes of IP address to be a sign of illicit activity.

This is tricky already, anyway. With happy-eyeballs sort of behavior,
this can already happen (one connection happens over v4, and a
subsequent happens over v6).

I do believe that, for all such cases, giving apps more control (and
awareness!) regarding v6 addressing and what they can do about it is
needed. But that would be out of cope for this particular document, I think.

That said, we could add a comment about this issue in this document.
Thoughts?



> (Remember, my concern is only about the default configuration
> and the resulting puzzlement of ordinary users and help desks.)

Another part of the problem here is that you cannot hint the network
about what to do. e.g., see draft-gont-6man-managing-slaac-policy

Thanks!

Cheers,
-- 
Fernando Gont
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