Bug ID 770657: On hardware platforms with ePVA, some valid traffic is blocked when in L2 transparent mode and syn cookies are enabled

Last Modified: Jan 20, 2023

Bug Tracker

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

Known Affected Versions:
14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 14.1.2.3, 14.1.2.4, 14.1.2.5, 14.1.2.6, 14.1.2.7, 14.1.2.8, 14.1.3, 14.1.3.1, 14.1.4, 14.1.4.1, 14.1.4.2, 14.1.4.3, 14.1.4.4, 14.1.4.5, 14.1.4.6, 14.1.5, 14.1.5.1, 14.1.5.2, 14.1.5.3, 15.0.0, 15.0.1

Fixed In:
15.1.0, 15.0.1.1

Opened: Apr 09, 2019
Severity: 3-Major

Symptoms

Valid traffic gets blocked under L2 transparent mode if syn cookie protection is enabled.

Impact

Some valid traffic gets blocked.

Conditions

-- In L2 transparent mode. -- Syn cookie protection is enabled. -- ePVA offloading is enabled. -- BIG-IP platform contains the embedded Packet Velocity Acceleration (ePVA) chip. -- Attack traffic in progress.

Workaround

None.

Fix Information

-- For releases 15.0.x and earlier, ePVA offloading is now disabled if syn cookie is turned on. -- Beginning with release 15.1.0, ePVA offloading works as expected with syn cookies.

Behavior Change