Re: [core] I-D Action: draft-greevenbosch-core-minimum-request-interval-01.txt

Bert: Thanks for updating this.
I referred to the -00 in my reply to Martin Stiemerling's IESG comments.

There were some comments in the Orlando meeting that people didn't quite know when to use such an Option and how to find a good value to put in it.
(I think we need to check whether there is a better metric to use for throttling/load shedding than the elapsed time between two requests.)
It would probably help to look at the use cases in some more detail.  What specifically is a server trying to achieve by limiting the request interval?
What kind of metric aligns best with such an objective?

Just to build a very rough strawman for such an alternative metric: 
A server could ask a client to send the next request only after twice the time it took the client to obtain the previous response.
(This would figure in network load in a way that the server on its own cannot do.)

Another issue is the scope of the throttling: Is it for a single resource, this endpoint, the IP address, a prefix (say, a /64)?
(Wider scopes have more security implications.)

Grüße, Carsten

On Apr 26, 2013, at 11:23, internet-drafts@ietf.org wrote:

> 
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> 
> 
> 	Title           : CoAP Minimum Request Interval
> 	Author(s)       : Bert Greevenbosch
> 	Filename        : draft-greevenbosch-core-minimum-request-interval-01.txt
> 	Pages           : 8
> 	Date            : 2013-04-26
> 
> Abstract:
>   This document defines an "Minimum-Request-Interval" option for CoAP,
>   which can be used to negotiate the minimum time between two
>   subsequent requests within a single client and server pair.  It can
>   be used for flow and congestion control, reducing the consumption of
>   server and network resources when needed.
> 
> Note
> 
>   Discussion and suggestions for improvement are requested, and should
>   be sent to core@ietf.org.
> 
> 
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-greevenbosch-core-minimum-request-interval
> 
> There's also a htmlized version available at:
> http://tools.ietf.org/html/draft-greevenbosch-core-minimum-request-interval-01
> 
> A diff from the previous version is available at:
> http://www.ietf.org/rfcdiff?url2=draft-greevenbosch-core-minimum-request-interval-01
> 
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
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