# DNS Response as Authoritative from GSLB server mode A10

**URL:** <https://community.a10networks.com/t/dns-response-as-authoritative-from-gslb-server-mode-a10/821>\
**Category:** ADC - Application Delivery\
**Tags:** gslb, slb-adc\
**Created:** [January 8, 2024, 9:19pm UTC](https://community.a10networks.com/t/dns-response-as-authoritative-from-gslb-server-mode-a10/821 "2024-01-08T21:19:49Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![anfovar](https://avatars.discourse-cdn.com/v4/letter/a/bc79bd/32.png) [@anfovar](https://community.a10networks.com/u/anfovar)\
**Post date:** [January 8, 2024, 9:19pm UTC](https://community.a10networks.com/t/dns-response-as-authoritative-from-gslb-server-mode-a10/821/1 "2024-01-08T21:19:49Z")

</div>

Hi  
I want to configure the a10 to response as Authoritative so when someones quieres a FQDN in the A10 as server mode they will get the Authority flag = 1

I attach some screenshoots from my lab

 ![image.png](https://us1.discourse-cdn.com/flex002/uploads/a10_community/original/1X/87e4fd6418283e0d1e3343c19931501d383cb80e.png)

 ![image.png](https://us1.discourse-cdn.com/flex002/uploads/a10_community/original/1X/63c84d5efe0dd13c5c0cc7f1a16081fcf04a0ad1.png)  
As you can see in the second screenshot authority = 0  
Thanks for the help!

---

<div class="post-metadata">

**Author:** ![mdunn](https://avatars.discourse-cdn.com/v4/letter/m/87869e/32.png) [@mdunn](https://community.a10networks.com/u/mdunn)\
**Post date:** [January 10, 2024, 5:18pm UTC](https://community.a10networks.com/t/dns-response-as-authoritative-from-gslb-server-mode-a10/821/2 "2024-01-10T17:18:36Z")

</div>

In order to send a valid authoritative response, we need to include the NS record in the answer. This is accomplished by appending the NS record to the answer with “ns-list” in the policy config. Let’s trying configuring:

```yaml
gslb service-ip ns1 3.3.3.3
  health-check-protocol-disable
  health-check-disable
!
gslb site test
  slb-dev gslb-test 172.16.10.244
    vip-server ns1
!
gslb policy test
  dns server authoritative ns-list
!
gslb zone test.com
  dns-ns-record ns1.test.com

```

After the change, let’s see if authority = 1 in your test.