Re: [Question] What is an accurate meaning of "A server MAY cache a dead server indication"?

[Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp>]

bert hubert wrote:

> On Tue, Dec 27, 2005 at 07:20:29PM +0000, Paul Vixie wrote:
> 
>># > 7.2 Dead / Unreachable Server (OPTIONAL)
>># 
>># The PowerDNS recursor reserves the right to tune its server selection
>># process regardless of this RFC.
>>
>>that's probably why it says "OPTIONAL".
> 
> 
> Yes, but if you decide to do it, it tells you how to do it, making the
> entire section a bit odd.

In general, it is a bad idea to introduce timing parameters in
the Internetworking layer protocols including DNS, because proper
timing can be determined only by applications.

Though plain DNS does have several timing parameters in SOA,
they are tunable zone by zone, that is, approximately application
by application, and do not affect applicaiton timing so much.

						Masataka Ohta


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