Order and Preference Priority in DNS Responses

[Heiko Richter]

Am 03.08.2015 um 13:44 schrieb Reindl Harald:
> 
> 
> Am 03.08.2015 um 13:38 schrieb Harshith Mulky:
>> I wanted to understand how Order and Preference Values have an impact on
>> the answers Received from the DNS Server
>>
>> I am asking because, I have 4 records for NAPTR Query, as below
>>
>> carrier1.com 86400 IN NAPTR   50     50    “s”   “SIPS+D2T”  ““
>> “_sips._tcp.carrier1.com.”
>> carrier1.com 86400 IN NAPTR   90     50    “s”   “SIP+D2T”    ““
>> “_sip._tcp.carrier1.com.”
>> carrier1.com 86400 IN NAPTR 100   100   “s”  “SIP+D2U”  ““
>> “_sip._udp.carrier1.com.”
>> carrier1.com 86400 IN NAPTR 120    100   “s”  “SIPS+D2U”   ““
>> “_sip._tcp.carrier1.com.”
>>
>> I am expecting to receive the answer as _sip._udp.carrier1.com but i
>> receive _sip._tcp.carrier1.com
> 
> randomly
> 
> https://en.wikipedia.org/wiki/Round-robin_DNS
> 

Just saying "randomly" is not quite correct. At least not always.

Depends on the setting of rrset-order.