Bug ID 723288: DNS cache replication between TMMs does not always work for net dns-resolver

Last Modified: Oct 17, 2023

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

Known Affected Versions:
12.1.2, 12.1.3,,,,,,,, 12.1.4, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0,,,,,,,,, 13.1.1,,, 14.0.0,,,,, 14.1.0,,,,

Fixed In:,,,,

Opened: Jun 06, 2018

Severity: 3-Major


System DNS resolvers (net dns-resolver objects) do not share DNS reply information between the dns resolver instances across TMMs, which can result in separate TMMs performing seemingly-unnecessary DNS lookups.


A performance impact resulting from each TMM having to perform unnecessary DNS lookups.


There are no LTM DNS *cache* objects present in the BIG-IP configuration.


Use tmsh to create a placeholder LTM DNS cache resolver object. The object does not need to be used anywhere, just present in the config. Note: This workaround is effective even without a DNS license (although in that case, the placeholder object must be created using tmsh, as the GUI menu would not be available without a DNS license.)

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips