# dns transparent cache as authoritative?

**URL:** <https://community.f5.com/t/dns-transparent-cache-as-authoritative/44434>\
**Category:** Technical Forums\
**Tags:** big-ip-dns, caching, application-delivery\
**Created:** [February 24, 2021, 9:26pm UTC](https://community.f5.com/t/dns-transparent-cache-as-authoritative/44434 "2021-02-24T21:26:48Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Jason\_Brooks](https://avatars.discourse-cdn.com/v4/letter/j/f04885/32.png) [@Jason\_Brooks](https://community.f5.com/u/Jason_Brooks)\
**Post date:** [February 24, 2021, 9:26pm UTC](https://community.f5.com/t/dns-transparent-cache-as-authoritative/44434/1 "2021-02-24T21:26:48Z")

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Hello,

I have inherited an f5 pair that is (in theory) an authoritative-only name server. it has a pool of three dns servers it passes queries to.

The first lookup using the f5 as the dns server has the authoritative bit set. However, subsequent queries (cache hit) do not, until the ttl time has elapsed. In other words, it acts as a standard dns caching server that sets authoritative when it has to query an authoritative server for an answer.

Is there a way to set up the F5 with this configuration to always answer authoritative?

bigip version 15.1.0.5

udp listener with dns profile name: “authoritative\_dns”

authoritative\_dns profile set:

parent == dns

dns express enabled

dns cache enabled: set to “authoritative\_cache”

authoritative\_cache set:

resolver type: transparent (NONE)

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<div class="post-metadata">

**Author:** ![Nikoolayy1](https://d1p9zq3aats0t8.cloudfront.net/user_avatar/community.f5.com/nikoolayy1/32/3589_2.png) [@Nikoolayy1](https://community.f5.com/u/Nikoolayy1)\
**Post date:** [March 27, 2021, 9:00am UTC](https://community.f5.com/t/dns-transparent-cache-as-authoritative/44434/2 "2021-03-27T09:00:50Z")

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I don’t think this possible as F5 may have not implemented this to not violate the DNS standards. You can configure DNS Express zone and in this way the f5 will be slave zone authorative DNS server:

> **[404 Page not found | BIG-IP Documentation](https://techdocs.f5.com/kb/en-us/products/big-ip%5C_ltm/manuals/product/dns-services-implementations-11-5-0/1.html)**
>
> Usage information and technical documentation for BIG-IP and other related F5 products