Bug ID 876937: DNS Cache not functioning

Last Modified: Sep 13, 2023

Affected Product(s):
BIG-IP APM(all modules)

Known Affected Versions:
14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,

Fixed In:
16.0.0, 15.1.4,

Opened: Feb 05, 2020

Severity: 1-Blocking


DNS queries are not being cached on the BIG-IP device.


DNS queries are forwarded, but the BIG-IP system does not cache them.


-- DNS cache is enabled (System :: Configuration : Device : DNS Cache). -- Device receives DNS queries.



Fix Information

DNS queries are now cached when DNS Cache is enabled.

Behavior Change

Full DNS cache functionality has been restored. This results in performance degradation. You might notice it in OCSP performance, when compared to releases in which full DNS cache functionality is not present. By default, DNS cache is disabled. To recapture performance, enable DNS cache.

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips