Last Modified: Oct 16, 2023
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
11.5.4, 11.5.5, 11.5.6, 11.6.0, 11.6.1, 11.6.2, 11.6.3, 11.6.3.1, 12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2
Fixed In:
13.0.0, 12.1.2 HF1, 11.6.3.2, 11.5.7
Opened: Jul 07, 2016 Severity: 3-Major Related Article:
K63164073
Virtual server remains in syncookie mode even after the syn flood stops. As a result of this issue, you might see the following symptoms: -- Virtual servers that use both FastL4 and HTTP profiles might show incorrect 'Current SYN Cache' stats. -- Virtual stats 'Current SYN Cache' does not decrease.
The virtual server stays stuck in syncookie mode after the synflood is over, and does not recover.
This issue occurs when the configuration contains a virtual server that uses FastL4 as a filter (for example, has both the FastL4 profile and layer 7 profile (HTTP) syn flood to the virtual server).
None.
Virtual servers that use both FastL4 and HTTP profiles will have correct syn cache stats.