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,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,,,, 14.1.5,,,, 15.0.0, 15.0.1

Fixed In:

Opened: Apr 09, 2019
Severity: 3-Major


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


Some valid traffic gets blocked.


-- 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.



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