Forum Discussion

Cirrus

Sep 24, 2017

GTM Design For External DNS Queries

Hello, I'm a little bit confused here as I'm setting up my upcoming project design which includes 2 boxes with GTM and LTM modules each, and each box will be located in a site (SITE A, SITEB),G...

application delivery

BIG-IP DNS

F5_324021
Oct 09, 2017
Hello,

what about the A record ip address of the Ns gtm1 is it the ip address of the listener configured on the GTM or is it the self ip address of the GTM?

Also i have another question when doing the same delegation from the external DNS (Internet side) the delegation configuration will be as you stated the following:-

ns1.gtm.example.com A X.X.X.X wip.example.com NS ns1.gtm.example.com

Here the X.X.X.X Ip address will be the piblic ip address of the GTM to be natted on the firewall or what?regardless if its the listener or the self ip of the GTM.

Hope you can help me

Thank you..

Kevin_K_51432

Historic F5 Account

Greetings,

The flow looks like this:

Internet
|
Firewall
| |
| |<------>GTM
|
|<------>LTM

The GTM server object's Address is the Firewall IP address (basic TCP connectivity), while the Translation IP address is the internal LTM IP address (this address is learned via iquery).

K14707: Configuring BIG-IP DNS server objects for BIG-IP devices that reside behind a firewall NAT

https://support.f5.com/csp/article/K14707

Kevin

Kevin_K_51432

Historic F5 Account

Sep 24, 2017

Greetings, These articles are fairly short and discuss basic BIG-IP DNS (GTM) functionality with regards to DNS delegation and DNS resolution:

K277: Delegating a subdomain to a BIG-IP DNS or BIG-IP Link Controller system from another DNS server

https://support.f5.com/csp/article/K277

Replacing a DNS Server with BIG-IP DNS

https://support.f5.com/kb/en-us/products/big-ip-dns/manuals/product/bigip-dns-implementations-12-1-0/6.html

K14421: Achieving split DNS behavior through BIG-IP DNS wide IPs