Bug ID 1497861: DNS query fails with low EDNS0 buffer size

Last Modified: Dec 18, 2024

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

Known Affected Versions:
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, 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

Fixed In:
17.1.2

Opened: Jan 31, 2024

Severity: 3-Major

Symptoms

DNS query with EDNS0 buffer size below 30 bytes fails with error message "Failure to query dns-express db (Discarded)".

Impact

No response received for DNS queries with EDNS0 buffer size below 30 bytes.

Conditions

DNS query sent with EDNS0 buffer size below 30 bytes.

Workaround

None

Fix Information

UDP payloads with sizes less than 512 bytes will be considered as 512 bytes.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips