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

Forum Discussion

Khaled_HA's avatar
Khaled_HA
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Sep 01, 2023

Zon Runner resource record delayed population

Hi All, I have F5 GTM and when creating a record, it is taking so much time to be populated on the internet.   For example, I created PTR record and it took more than 30 min to be populated online...
application delivery
Mohamed_Ahmed_Kansoh's avatar
Mohamed_Ahmed_Kansoh
Icon for MVP rankMVP
Sep 01, 2023

Hi  Khaled_HA , 

Have you checked the LDNS cache for internet population ? 

For the dnsxdump >> I believe you did the internal zone transfer from Bigip local BIND ( which created by Zonerunner ) to be serverd by DNSexpress , Correct ? 

maybe you have an issue with syncing the changes / new zones or records creations with DNSexpress 
So please try to open the name configuration tab and add this statement in your configs under allow-transfer

also-notify {Listner_IP_address_of_bigip;};

statement: 

I'm not sure which IP will be used but try the TCP Listner IP or the internal local host ip 127.0.0.1 , because in zone transferes bigip relies on it's TCP listner to sync Zone changes/or updates so just try both of ips , by this you allow BIND to notify DNSexpress that new record added. 


I faced this scenario but there were 2 DNS servers ( DNS master and bigip as a slave ) I used also-notify statment to allow-notify and share the updates quickly between Master and slave DNS server. 

Try all of this , and if this not solved your issue , let me know more about your issue or design flow. 

I hope this helps you 🙂 

Khaled_HA's avatar
Khaled_HA
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Sep 03, 2023

Dear Mohammed,

 

Appreciate your support, but how can I check the LDNS cache for internet population?

 

BR

  • Mohamed_Ahmed_Kansoh's avatar
    Mohamed_Ahmed_Kansoh
    Icon for MVP rankMVP
    Sep 03, 2023

    Hi Khaled_HA , 

    I meant if you're working for Corp users within enterprise , so you will have access on LDNS that serves intenal users. 

    if this world-wide production through public internet of course you can't check LDNSs. 

    but anyway , it was just primary troubleshooting , and if there is a deley in DNSxdump output updates , you need to check the second part that I explained above in the first comment.