SERVFAIL <=> NXDOMAIN

Irenäus Becker becker at dominic.de
Fri Jun 15 11:55:36 CEST 2007


Hi,

thank you very much. This helps us to solve our problems.

Best regards,
Irenäus

>> Nic.at now checks all nameserver for existing entries for affected zone. 
>> If all nameservers return a NXDOMAIN (Bind) everything is fine.
>> Our NSD nameservers return the status SERVFAIL. Nic.at interprets this 
>> return-code as an error and does not finish this transaction completely.
>>     
>
> I haven't checked your view of nic.at's policies and/or procedures and would
> appreciate a comment from AT. That said, ...
>
>   
>> Is it possible to return a NXDOMAIN instead of a SERVFAIL? Are there 
>>     
>
> ... SERVFAIL is probably the more protocolly correct response but not the only
> possible one.
> Some scenarios are listed in <draft-koch-dns-unsolicited-queries-01.txt>
>
>   
>> different  possibilities how this point can be resolved?
>>     
>
> If you really need to respond NXDOMAIN (and again, I'm not saying you do),
> one approach is to define an empty (lest the served delegations) parent TLD
> (here: AT) zone on your server(s). But careful: there may be side effects
> and you should make sure not to leak false information.  The bottom line is:
> if the problem exists, it can be solved by configuration, not by teaching
> nsd to violate the protocol.
>
> -Peter
>
>
>   

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