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Forum Discussion

Sefi_Miz's avatar
Sefi_Miz
Icon for Altostratus rankAltostratus
Apr 11, 2021

CNAME and A record in F5 DNS

Hi, I have F5 GTM version 15.1.2.1 and I have problem in configure A record with cname pool. I created cname pool with long member of Heroku domain and then I add this pool to A record with my doma...
BIG-IP DNS
devops
Sefi_Miz's avatar
Sefi_Miz
Icon for Altostratus rankAltostratus
Apr 13, 2021

Hi,

 

Thank you for your answer but I just want to understand it with example:

If I have address "a.com" and I want to create cname for it with wideip record from my domain "test.sefi" so the final outcome will be that everyone that type in their browser "test.sefi" will go to "a.com" I should create cname pool with static target to "a.com" and then create wideip A record and widip cname record that they both going to the cname pool I created for "a.com"??

  • Nikoolayy1's avatar
    Nikoolayy1
    Icon for MVP rankMVP
    Apr 13, 2021

    Yes. From what I understand the a.com dns is not managed by the same f5 DNS/GTM device, so if this is the case create static target, so create A record wideip for test.sefi with Cname record pool with static target a.com. Just in case I will recomend to also create another wide ip for CNAME record type for test.sefi with the same CNAME pool as the A record wideip for test.sefi as some applications may make a CNAME DNS request.

     

     

     

    If the F5 will manage also a.com, then you will also need to create A record wideip for a.com and use it as pool member for the Wide IP for test.sefi (not the static target).

     

     

     

     

    This has the best explanation, even has pictures for what you want (Go to section " BIG-IP DNS load balancing > Wide IPs and pools"). I also recomend reading the whole guide as it is not so long and it covers most of the options for F5 DNS/GTM.

     

    https://support.f5.com/csp/article/K55502976