Re: [dhcwg] dhc wg last call on dhcpv6-reconfigure-rebind

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Bernie Volz (volz) wrote:
> Since it looks like this draft will need a revision, might we also want
> to address the following issues?
> 
> 1. When should a Client send a Reconfigure Accept (and the server
> respond with Reconfigure Accept). RFC 3315 only mentions this for the
> Solicit/Advertise and Request/Reply exchanges. Not for a Renew or
> Rebind.
> 
> Should this be prohibited on a Renew/Rebind? Is it optional? If allowed,
> what should a client do if the client previously received a Reconfigure
> Accept (Request/Reply) but fails to in the Renew/Reply or Rebind/Reply
> exchange? Should it disable Reconfigure support?

In my mind the Reconfigure Accept is part of the lease. A server may require
clients use Reconfigure Accept or not issue a lease, for instance.

While the server could check the presence of this in Renew or Rebind messages, I
think it would be simpler to always omit the option, and use the value from the
original Reply.

This doesn't match what the table in 3315 says, because the table allows
Reconfigure Accept in Renew or Rebind. But if we allow it, we should make it
clear that the server has to re-evaluate the lease based on a possible change of
the Reconfigure Accept value.

> 2. The text in RFC 3315 isn't clear about when the server sends a
> Reconfigure Accept? In 18.2.1 (Receipt of Request Messages) in RFC 3315,
> is written:
>  
>     The server includes a Reconfigure Accept option if the server wants
>     to require that the client accept Reconfigure messages.
>  
> Does this apply even if the client has not sent a Reconfigure Accept
> option in the Request message? That seems likely to be useless since the
> client probably won't accept Reconfigure Accept (since if it did, it
> would have sent the option in the Request).
> 
> In a brief private exchange with Ralph, he thought that a qualifying
> clause is needed:
> 
>     The server includes a Reconfigure Accept option if the server wants
>     to require that the client accept Reconfigure messages, if the
> client
>     sent a Reconfigure Accept option in the Request.

Makes sense to me.

- --
Shane
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