(use-)alt-transfer-source deprecated

[Gasoo]

Hello Matthijs

Thank you for clarifying, it makes sense now.
I'll just leave use-alt-transfer-source in the configuration for now and 
remove it before updating to 9.20.

Kind Regards
Stephan


On 01/02/2023 10.45, Matthijs Mekking wrote:
> Hi,
>
> On 2/1/23 09:57, Gasoo wrote:
>> Hello
>>
>> I recently updated to 9.18.x and noticed the deprecation warning in 
>> the logs for the option use-alt-transfer-source.
>> After reading the manual and checking my configuration, I am confused 
>> on how this is going to work in future releases.
>>
>> My configuration includes the following statements:
>>
>> options {
>>    listen-on { 1.1.1.1; 2.2.2.2; 3.3.3.3; };
>>    transfer-source  3.3.3.3;
>>    query-source  3.3.3.3;
>>    notify-source  3.3.3.3;
>>    use-alt-transfer-source no;
>>    ...
>> }
>
> Looking at your configuration, you actually don't use 
> alt-transfer-source: there is no such option in your example and 
> 'use-alt-transfer-source' is set to no anyway.
>
>> 1.1.1.1 and 2.2.2.2 are only used for incoming DNS queries from 
>> clients and can not be used for zone transfers.
>> If I remove the option use-alt-transfer-source, in some cases (e.g. 
>> SERVFAIL from primary), additional zone transfers are tried via 
>> 0.0.0.0#0, which the OS then sends via the best matching interface / 
>> IP address. >
>> For this reason the option use-alt-transfer-source is in my 
>> configuration.
>
>>  From the manual.
>>
>> use-alt-transfer-source:
>> This indicates whether the alternate transfer sources should be used. 
>> If views are specified, this defaults to no; otherwise, it defaults 
>> to yes.
>> alt-transfer-source:
>> This indicates an alternate transfer source if the one listed in 
>> transfer-source fails and use-alt-transfer-source is set.
>>
>>
>> How will this be handled in future releases, if transfer-source is 
>> specified, no views are defined and an error occurs?
>> Is there any other solution to disable transfers from 0.0.0.0#0 in my 
>> case?
>
> I guess in your 9.18 configuration if you don't set 
> 'use-alt-transfer-source', it defaults to yes. Since 
> 'alt-transfer-source' defaults to 0.0.0.0#0', you still need the 
> configuration despite it is being deprecated.
>
> From 9.20.0 the feature will be gone, the options 
> 'use-alt-transfer-source' and 'alt-transfer-source' will no longer 
> exist, and thus alternate transfer source will no longer be tried.
>
> In other words, from 9.20.0 it will be as if 'use-alt-transfer-source' 
> was set to 'no'.
>
> Best regards,
>
> Matthijs
>
>
>>
>>
>> Kind Regards
>> Stephan
>>