Is this scenario possible?

[Matus UHLAR - fantomas]

>In article <mailman.1996.1389470377.20661.bind-users at lists.isc.org>,
> Blason R <blason16 at gmail.com> wrote:
>> Pertaining to the same discussion. Can someone validate below zone files
>> and named.conf files? What I wanted to achieve here is; I wanted to make
>> mail.example.com as my sub domain and give them A record so that I could
>> load balance the traffic on LBs since my LBs are offering inbuilt DNS server
[...]
>> ##################################
>> #
>> # master.example.com
>> ##################################
[...]
>> $ORIGIN mail.example.com.
>>
>> @             IN      NS     ns3.mail.example.com.
>>
>> ; the next name server points to ns1 in the example.com zone above
>>               IN      NS     ns1.example.com.
>> ; sub-domain address records for name server only - glue record
>> ns3           IN      A      20.20.20.21 ; 'glue' record
[...]
>> #############################################
>> # mail.example.com zone file
>> #############################################
>> #
>>
>> $TTL 2d ; default TTL = 2 days
>> $ORIGIN mail.example.com.
>> @              IN     SOA   ns3.mail.example.com.
>> hostmaster.mail.example.com. (
>>                2003080800 ; serial number
>>                2h         ; refresh =  2 hours
>>                15M        ; update retry = 15 minutes
>>                3W12h      ; expiry = 3 weeks + 12 hours
>>                2h20M      ; minimum = 2 hours + 20 minutes
>>                )
>> ; sub-domain name servers
>>                   IN      NS     ns3.mail.example.com.

On 11.01.14 15:33, Barry Margolin wrote:
>You also need:
>
>                    IN      NS     ns1.example.com.

to be more precise it's not needed, but recommended, since
- it's recommended to have more NS records 
- the delegation NS appears in parent zone
- NS records from the zone prevail over delegation and if
   ns3.mail.example.com fails and resolving DNS has authoritative NS cached,
   it won't query ns1.example.com. until the authoritative NS expires.

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Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
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