Last Modified: Oct 15, 2025
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 14.1.2.3, 14.1.2.4, 14.1.2.5, 14.1.2.6, 14.1.2.7, 14.1.2.8, 14.1.3, 14.1.3.1, 14.1.4, 14.1.4.1, 14.1.4.2, 14.1.4.3, 14.1.4.4, 14.1.4.5, 14.1.4.6, 14.1.5, 14.1.5.1, 14.1.5.2, 14.1.5.3, 14.1.5.4, 14.1.5.6, 15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 15.1.1, 15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1, 15.1.8.2, 15.1.9, 15.1.9.1, 15.1.10, 15.1.10.2, 15.1.10.3, 15.1.10.4, 15.1.10.5, 15.1.10.6, 16.1.0, 16.1.1, 16.1.2, 16.1.2.1, 16.1.2.2, 16.1.3, 16.1.3.1, 16.1.3.2, 16.1.3.3, 16.1.3.4, 16.1.3.5, 16.1.4, 16.1.4.1, 16.1.4.2, 16.1.4.3, 16.1.5, 16.1.5.1, 16.1.5.2, 16.1.6, 17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1, 17.1.1.2, 17.1.1.3, 17.1.1.4, 17.1.2, 17.1.2.1, 17.1.2.2, 17.1.3, 17.5.0, 17.5.1, 17.5.1.2, 17.5.1.3
Opened: Sep 20, 2025 Severity: 4-Minor
When creating an FQDN pool member and referencing an FQDN node that does not already exist, the FQDN node is created implicitly using values specified for the FQDN pool member. In this scenario, the FQDN node is always created with its "address-family" option set to "all". It is not possible to specify an "address-family" value for the FQDN node in this scenario.
The FQDN node created cannot be configured with an "address-family" option set to anything but "all" (such as "ipv4" or "ipv6"). As a result, ephemeral nodes may be created with either IPv4 or IPv6 addresses (depending on DNS query results) which are not desired.
This occurs when: -- Creating an FQDN pool member, either via the tmsh command-line interface (CLI) or the TMUI GUI, and -- Referencing a new (not existing) FQDN node.
You can, -- First, create the FQDN node with the desired "address-family" value. -- Then create the FQDN pool member, referencing the previously-created FQDN node. To correct the configuration of the FQDN node, the FQDN node and pool member must be deleted and re-created: 1. Delete FQDN pool member 2. Delete FQDN node 3. Create FQDN node with desired configuration 4. Create FQDN pool member with desired configuration
None