[bind10-dev] Nameserver Address Store and RFC 2308 - Comments Requested

[Jerry Scharf]

Joao,

We do need to update the ttls to see that a server has now decreased in 
ttl. Increasing ttl is not a problem. This can be done with 
opportunistic probes or explicit probes. Opportunistic probes have the 
advantage of reflecting the activity of a zone and not creating 
additional traffic. Explicit probes have the advantage of not slowing 
down production traffic and being far more deterministic.

My belief is that the decision for opportunistic probes reflects the 
desire to not update the nameserver ttl for a rarely used zone . It was 
also the simplest thing to do. :)

jerry

On 11/24/2010 9:04 AM, João Damas wrote:
> yes, but bear in mind that the fastest server may change over time, so don't forget to probe every x-queries (opportunistic probe, not periodical refresh of the list of servers)
>
> Joao
>
> On 24 Nov 2010, at 17:22, Jerry Scharf wrote:
>
>> Stephen,
>>
>> My concern with your proposal is that the average time for the user to get their answer in increased with your method. I think we want to use the fastest nameserver for all but the sporadic probes to update the TTL list.
>>
>> jerry
>>
>> On 11/24/2010 02:56 AM, Stephen Morris wrote:
>>