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

Forum Discussion

JG's avatar
JG
Icon for Cumulonimbus rankCumulonimbus
Feb 09, 2015

Pool members with fully-qualified domain names (FQDNs): How does this work?

From release notes of v11.6.0 (on new features):   Populate pools by FQDN This release includes the ability to configure a BIG-IP system with nodes and pool members that are identified with fully...
application delivery
availability
deployment
design
LTM
performance
Brad_Parker_139's avatar
Brad_Parker_139
Icon for Nacreous rankNacreous
Feb 10, 2015

The FQDN node list will auto populate all the nodes that are returned by the DNS query; they are called ephemeral nodes. You need to make sure your DNS server is set to return all A records for this to occur.

 

Brad_Parker_139's avatar
Brad_Parker_139
Icon for Nacreous rankNacreous
Feb 11, 2015
I've actually been playing with this in our test environment. The nodes will be created at the time of the original DNS query, however you can configure the LTM to auto populate and you can choose the interval that the LTM re-queries DNS. By default auto populate is on and re-checks once an hour. If an IP is not returned that was originally it will be removed and subsequently, if a new IP is returned it will be added. I hope this helps. https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/ltm-implementations-11-6-0/32.print.html