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Re: [dhcwg] IETF-93 Follow Up - draft-ietf-dhc-stable-privacy-addresses (Respond by Aug 11, 2015)

Lorenzo Colitti <lorenzo@google.com> Wed, 12 August 2015 01:59 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Wed, 12 Aug 2015 10:58:41 +0900
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Subject: Re: [dhcwg] IETF-93 Follow Up - draft-ietf-dhc-stable-privacy-addresses (Respond by Aug 11, 2015)
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On Tue, Aug 11, 2015 at 11:15 PM, Chuck Anderson <cra@wpi.edu> wrote:

> it offers a useful way to implement DHCPv6 Failover using a
> calculated technique rather than state-sharing,


But it doesn't. With this scheme, if the client issues a DECLINE for any
reason (e.g., because the address that's assigned is a duplicate, or due to
a temporary link problem such as a looped port), there are exactly two
options to make things work correctly:

1. Leave that client without an IPv6 address.
2. Make all the DHCPv6 servers on the link record all leases and share all
lease state, losing all the benefits of statefulness.

This is a fundamental flaw in this scheme which I believe cannot be fixed.

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