[dns-operations] .ORG is signed

Dave Knight dknight at ca.afilias.info
Fri Jun 5 13:36:34 UTC 2009

On 5-Jun-09, at 9:04 AM, Alexander Gall wrote:

> On Fri, 5 Jun 2009 14:52:15 +0200, Alexander Gall <gall at switch.ch>  
> said:
>> On Fri, 05 Jun 2009 13:53:07 +0200, Florian Weimer <fweimer at bfk.de>  
>> said:
>>> * Chris Thompson:
>>>> This happens whether the DO bit is set in the request or not. Was  
>>>> it
>>>> happening before the zone was signed?
>>> There was a time when negative responses weren't consistent across  
>>> all
>>> the servers, but some of the servers returned a zero TTL, too.  So  
>>> the
>>> answer is "yes".
>> Indeed.  Also note that the TTL on the SOA RR itself is 0 as well.  I
>> once asked them why they do this and their answer was a reference to
>> RFC 1035, Section 3.2.1 (in the description of TTL):
>>  "For example, SOA records are always distributed with a zero TTL to
>>   prohibit caching."
>> I then pointed them to RFC2181 section 7.2. but never got a reply to
>> that.  If they only implement 1035, they might not have heared of
>> negative caching either ;)
> On second thought, lack of negative caching is a consequence of the
> zero SOA TTL, since the TTL of a negaive response is the minimum of
> the SOA TTL and the "minimum" field of the SOA RDATA.

A fix for this is in the works, it's going to be implemented for .ORG  
this month.

Thanks for your attention,


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