[ntpwg] KoD 'backoff' BCP/direction

[David L. Mills]

Danny,

These are not my words; I wish they would go away in a formal 
specification document. My recommendation, and I spent a good deal of 
time on it, is the headway scheme described in the current documentation 
and now implemented. This may not be the only scheme, but should serve 
as a model for future adaptations.

Dave

Danny Mayer wrote:

> Harlan Stenn wrote:
>
>> The draft says:
>>
>> a. For kiss codes: DENY, RSTR the client MUST demobilize any
>> associations to that server and stop sending packets to that
>> server;
>>
>> b. For kiss code: RATE the client MUST immediately reduce its
>> polling interval to that server and continue to reduce it each
>> time it receives a RATE kiss code.
>>
>> >From my POV this is almost helpful.
>>
>> For case (a), for what duration SHOULD the client demobilize and stop
>> sending packets to that server?
>>
>
> Indefinitely. It should never try and contact that server again.
>
>> For case (b), are there any recommendations on how much the client
>> SHOULD reduce the rate at which it is polling the server?
>>
>
> No. It was deliberately left vague. It's hard to decide that question. I
> would recommend backing off by doubling the interval between polls every
> time one of these packets is received.
>
>> In case (b), do we mean 'polling rate' (or frequency) instead of
>> 'polling interval'?
>>
>
> Yes, that's an error on my part. Thanks for catching it. It should be
> reduced frequency.
>
>> Is there an easy way the server could 'offer a suggestion' in either of
>> these cases? What are the costs/benefits to having the server offer
>> ideas on these rate limits instead of relying solely on the client?
>
>
> The server can never really make recommendations. That's up to the
> implementation, dependent on requirements. Saying "back-off" should be
> enough for the client to take the appropriate action.
>
> Danny
>
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