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Re: I-D Action: draft-linkova-6man-default-addr-selection-update-00.txt

Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 07 April 2017 15:01 UTC

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Subject: Re: I-D Action: draft-linkova-6man-default-addr-selection-update-00.txt
To: Jen Linkova <furry13@gmail.com>
References: <149093611351.8864.5121956820429281359@ietfa.amsl.com> <1f8d497b-3286-2074-7c2e-f224ceda55a8@gmail.com> <CAO42Z2wREkid1tCNCQz9HriFC_xD9K=WB=vS4UO3oEHMSfsN7g@mail.gmail.com> <CAFU7BAR1ZJBnu=+pjNGYD37YghXhYRTJAUpcSd=XvtJY=4k4UA@mail.gmail.com> <CAAedzxrqbcoVu0YMnEz=uNNqnuAnD=ToBU9P_3K41KdWBWqGKw@mail.gmail.com> <CAFU7BARyPiPncGtidixP2A248X_2mS04cJrfW3TAyV8txKHAsw@mail.gmail.com> <CAAedzxq4ObCLgeizkcmXRNUVJF_2Mv5xWy_5G=YGws15fC-_Og@mail.gmail.com> <696ab419-ed78-7a52-94be-96ea1e2d3e58@gmail.com> <CAFU7BATBwAEs5sjy5+nqauB3vW=87w_3MJ83ZemDu6P+SVs2Fw@mail.gmail.com>
Cc: Erik Kline <ek@google.com>, 6man <ipv6@ietf.org>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Sat, 08 Apr 2017 03:01:35 +1200
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On 08/04/2017 02:45, Jen Linkova wrote:
> On Fri, Apr 7, 2017 at 4:05 PM, Brian E Carpenter
> <brian.e.carpenter@gmail.com> wrote:
>> But Jen is correct, we also have to consider reality with clashing
>> addresses.
>>
>> Doesn't that mean that "when the host moves from one network segment
>> to another" we should suggest that the stack *deletes* all state
>> learned from that network interface? (And yes, that breaks RFC6059.)
> 
> Well...I do not know the right answer...In some scenarios it does make
> sense (for example I'd prefer my laptop and my desktop
> to do that), while for mobile devices it might not be the best way to
> operate (why DNA was created in the first place?).
> Maybe DNA assumptions need to be changed to 'the combination of the
> link-layer address, the link-local IPv6 address and the list of PIOs
> is unique across links'?

Or maybe DNA implementations need to embody a heuristic approach,
not a fixed rule.

   Brian

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