Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP GTM, LTM
Known Affected Versions:
11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3
Fixed In:
12.0.0, 11.6.0 HF4, 11.5.1 HF6
Opened: Oct 10, 2014 Severity: 3-Major Related Article:
K16911
Unrecognized edns0 option may be considered malformed and dropped by the BIG-IP system.
All queries containing unrecognized option code are dropped. RFC says unrecognized options MUST be ignored.
Client sending queries with non-standard edns0 option code. The BIG-IP system is configured with a DNS profile.
To work around this issue, write an iRule to parse binary UDP payload; remove option from edns0 record.
Unrecognized DNS EDNS0 options are now ignored.