Bug ID 992865: Virtual server may not enter hardware SYN cookie mode on BIG-IP i11000 and i15000 series appliances

Last Modified: Jun 13, 2022

Bug Tracker

Affected Product:  See more info
BIG-IP TMOS(all modules)

Known Affected Versions:
14.1.4.4, 14.1.4.2, 14.1.4.1, 14.1.4, 14.1.3.1, 14.1.3

Fixed In:
16.1.2.2, 15.1.4

Opened: Feb 11, 2021
Severity: 3-Major

Symptoms

On particular platforms, virtual servers do not correctly enter hardware SYN cookie mode. Software SYN cookie mode still functions correctly.

Impact

Software SYN cookies are enabled, this has a performance impact compared to the hardware mode.

Conditions

-- Virtual server under SYN flood attack. -- One of the following platforms + BIG-IP i11000 series (C123) + BIG-IP i15000 series (D116)

Workaround

None

Fix Information

Virtual servers correctly enter hardware SYN cookie mode on all platforms.

Behavior Change