Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

Qasim's avatar
Qasim
Icon for Cirrostratus rankCirrostratus
Feb 17, 2020

F5 LTM/GTM DNS Record

Hi,   I want to use GTM just for a DNS record that will resolve to public IP if accessed over internet and private ip if requested internally. Is there a way of doing creating this without using/...
application delivery
BIG-IP DNS
DNS
gtm
irules
Qasim's avatar
Qasim
Icon for Cirrostratus rankCirrostratus
Feb 18, 2020

Hi,

 

thanks for your swift response.

 

normally if I am creating a DNS record that needs publishing to internet and is required internally, I use an IRULE in gtm W-IP that basically does that job for me. However, I need gtm pools and their relevant Virtual servers etc.

 

as this service is not required on LTM and I just need a DNS record, wonder if there's a way of doing this either in DNZ ZONErunner or WIDE-IP etc to get this done without creating any LTM virtual servers.

 

Let me know if you any further explanation?

 

Regards,

cjunior's avatar
cjunior
Icon for Nacreous rankNacreous
Feb 18, 2020

Hi,

 

I think I got the point.

 

Well, If create it in zonerunner you have simple dns BIND records and maybe it can't work for your need (same record for different topologies).

 

If you need to reply by topology dependency (internet/intranet), you will need the GTM intelligence.

 

An iRule could solve this or also creating servers and virtual servers on GTM/DNS to balance and send best choice replies.

 

But, I can't see a need to create LTM layer, then just a GTM layered objetcs to do this job.

You just need to setup a existent address to a "Generic Host" on GTM server/vs

 

Got it?

 

Best regards