Re: Problem with different TTL

Tim,

I'll try to work today on a cleaner patch and post it there for a code 
review.
If it's well accepted by the community, I'll submit it into the code 
repository.
I guess the change will be fairly simple and minor. I just need to 
figure out what's the good way to log with warnings ;-)

Thanks

Aurelien
On 6/01/2010 2:00 AM, Tim Tessier wrote:
> Aurelien,
>
> WARNING - not a file config example merely a RR example
>
> www IN A 127.0.0.1 TTL 25
> www IN A 127.0.0.2 TTL 50
>
> This is a problem because it's like saying that there are two separate TTL's
> for
> the same resource even though they are logically the same resource
> regardless if
> they are different physical resources.
>
> www IN A 127.0.0.1 TTL 25
> www IN A 127.0.0.1 TTL 25
>
> Alternatively, this does nothing for the configuration and is a possible
> hint at configuration
> problems or some other issue arising due to abnormal means.
>
> $TTL 86400
> SOA ...
> www IN A 127.0.0.1 TTL 25
> www IN A 127.0.0.2 TTL 50[defaulting to 8600] would be bad
>
>
> $TTL 86400
> SOA ...
> www IN A 127.0.0.1 TTL 25
> www IN A 127.0.0.2 TTL 50[defaulting to 25] and outputting a critical
> warning without failing is desired
>
>   I agree however, that this shouldn't break the system.
> I believe you are on the right track. The better approach would be to log a
> warning and not
> break the system. I do believe however that the TTL information will have to
> be removed
> from the record information or duplicated from the first because if it is
> not specified, then
> it might default to the default TTL for the zone which would be bad.
>   I believe a quick look at the bind sources is in order or a double check of
> what happens when
> that Bad TTL is not returned. I can't locate the RFC that says this but I am
> assuming that it is most definitely
> there and required, but also, should be handled by the dns configuration
> system. Of course, if I understood
> the problem correctly.
>
> Thanks,
> Tim Tessier
>
> --------------------------------------------------
> From: "Aurelien Requiem"<[email protected]>
> Sent: Tuesday, January 05, 2010 5:00 AM
> To:<[email protected]>
> Subject: Re: [Bind-dlz-testers] Problem with different TTL
>
>    
>> Tim, Rob,
>>
>> Rob, where did you get the information about the TTL please ? If you
>> could point this in a document or RFC that would be very good.
>>
>> Tim, the main goal of my patch is to have dlz behave like bind. Nothing
>> more.
>> As explained, with a flat file with bind, if 2 different TTLs are set,
>> only the 1st one is return for all records.
>> With dlz, nothing is returned. The patch allow dlz to behave just like
>> bind.
>>
>> Thanks
>>
>> PS : I know what you mean about VS and gdb ;-) Instead of gdb, try using
>> ddd :-)
>>
>> Aurelien
>>
>> On 5/01/2010 4:05 AM, Rob Butler wrote:
>>      
>>> DNS requires all the TTL's for a RRset be the same.  A RR set is all the
>>> records of the same type (like A, TXT, MX) for the same name.  Thus, if
>>> you have two records with the same name and of the same type with
>>> different TTL's, your data is incorrect.
>>>
>>> Rob
>>>
>>> ----- Original Message ----
>>>
>>>        
>>>> From: Tim Tessier<[email protected]>
>>>> To: [email protected]
>>>> Sent: Mon, January 4, 2010 10:56:52 AM
>>>> Subject: Re: [Bind-dlz-testers] Problem with different TTL
>>>>
>>>> Aurelien,
>>>>
>>>> I have taken a quick look at this, it appears that you are right about
>>>> the
>>>> db being
>>>> read properly at this point. And with your modification, are you trying
>>>> to
>>>> avoid
>>>> errors, is that the main goal? If you are trying to get the different
>>>> ttls
>>>> to appear
>>>> then this most likely will require a patch to bind itself.
>>>>
>>>> I am looking deeper into this however, as I need a little bit more time
>>>> to
>>>> set up
>>>> a mysql env to actually test this properly. Currently I have sqlite as
>>>> the
>>>> db, and although
>>>> I believe your assumptions to be correct I would like to be sure. Also,
>>>> it
>>>> was easy for me
>>>> to debug this little piece of code in windows using visual studio (
>>>> point
>>>> and click ), please don't
>>>> make fun, as I am not as familiar with gdb as I am with VS.
>>>>
>>>> Thanks,
>>>> Tim Tessier
>>>>
>>>> --------------------------------------------------
>>>> From: "Aurelien Requiem"
>>>> Sent: Saturday, January 02, 2010 4:09 PM
>>>> To:
>>>> Subject: Re: [Bind-dlz-testers] Problem with different TTL
>>>>
>>>>          
>>
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