Bug ID 713934: Using iRule 'DNS::question name' to shorten the name in DNS_REQUEST may result malformed TC response

Last Modified: Sep 13, 2023

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

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

Fixed In:

Opened: Apr 06, 2018

Severity: 3-Major


Received malformed Truncated DNS response.


DNS request might not be resolved correctly.


-- Using iRule 'DNS::question name' to shorten the name. -- DNS response is longer than 4096 UDP limit.


There is no workaround at this time.

Fix Information

In this release, when DNS::query name changes the query name, the software ensures that the request is updated with proper lengths.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips