Order and Preference Priority in DNS Responses
Heiko Richter
email at heikorichter.name
Mon Aug 3 14:42:50 UTC 2015
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
>
>
> How could I change this?
>
>
>
>
>
>
Hi there!
That exactly was the query you sent to the server?
Why would you expect to recieave the records with priority 100 and
preference 100?
BTW: As your records all have a different priority (first number) you
should sett the preference to 0 in all records. This field is only used
to do load-balancing when you have two or more records with the same
priority.
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