Last Modified: Oct 06, 2020
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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 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4
11.6.0, 11.5.1 HF5
Opened: Feb 25, 2014
Related AskF5 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.
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.