Bug ID 961229: The responses for EDNS/Non-EDNS UDP queries against DNS Express zone were truncated

Last Modified: May 29, 2024

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

Known Affected Versions:
14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,,,, 14.1.5,,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5,, 15.1.6,, 16.0.0,, 16.0.1,,

Fixed In:
16.1.0, 15.1.7

Opened: Oct 30, 2020

Severity: 3-Major


-- EDNS UDP query against DNS Express zone for larger responses get truncated. --Non-EDNS query against DNS Express zone was truncated completely including the ANSWER section.


No proper DNS responses.


--Configure UDP and TCP listeners with DNS profile that has DNSX enabled and BIND disabled. --Perform EDNS/Non-EDNS queries against the listener.


Perform either of the following workarounds: 1. Enable DNS Express minimal-responses using DB key dnsexpress.minimalresponse. For detailed information, please refer to K41004650: Enable DNS Express minimal-responses for the Authority and Additional Records sections 2. Disable truncating UDP DNS response using DB key dns.udptruncate. For detailed information, please refer to K91537308: Overview of the truncating rule when DNS response size is over 512 Bytes

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips