Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP AFM, GTM, LTM
Known Affected Versions:
10.2.4, 11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4
Fixed In:
11.6.0, 11.5.1 HF5
Opened: Feb 25, 2014 Severity: 3-Major Related Article:
K16240
IANA recently assigned option code 0x0008 to the client-subnet option of the EDNS0 record. Previously, the value was undefined, but processed as 0x50fa by various vendors.
The BIG-IP software treats the newly assigned value, 0x0008, as malformed, and the query is dropped.
EDNS0 with new client-subnet option code.
None
Option code 0x0008 to the client-subnet of the EDNS0 record is now recognized, so the BIG-IP software now accepts both 0x50fa and 0x0008.