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Re: rationale for the default of DupAddrDetectTransmits

Sowmini Varadhan <sowmini05@gmail.com> Wed, 19 July 2017 11:38 UTC

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From: Sowmini Varadhan <sowmini05@gmail.com>
Date: Wed, 19 Jul 2017 07:38:18 -0400
Message-ID: <CACP96tQT6aSs=UTd3HQt8nMk+rcv7ugmY7qH-5jLw5AKsr8e0w@mail.gmail.com>
Subject: Re: rationale for the default of DupAddrDetectTransmits
To: Ole Troan <otroan@employees.org>, Sowmini Varadhan <sowmini.varadhan@oracle.com>
Cc: "Bernie Volz (volz)" <volz@cisco.com>, 6man WG <ipv6@ietf.org>
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This was actually brought up some IETFs ago, see
https://tools.ietf.org/html/draft-yourtchenko-6man-dad-issues-01

Solaris 11 actually uses a common ACD engine for both
IPv4 and IPv6. I believe (?) Microsoft also does the same, perhaps
someone from MS can confirm.

If there's an interest in this, I'd be happy to provide more details
about the Solaris implementation.



On Wed, Jul 19, 2017 at 5:58 AM, Ole Troan <otroan@employees.org> wrote:
> Bernie,
>
> On 19 Jul 2017, at 11:38, Bernie Volz (volz) <volz@cisco.com> wrote:
>
> Packets get dropped or a node maybe "sleeping".
>
> There are ongoing checks based on normal ND traffic though so no explicit
> DAD needed.
>
>
> No, there is no collision detection as part of normal ND.
>
> Links might merge and split. See the previous links for an enumeration of
> DAD failure cases.
>
> We need an equivalent of IPv4's ACD.
>
> Ole

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