Last Modified: Oct 16, 2023
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
11.5.1 HF1, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.1 HF10, 11.5.1 HF11, 11.5.2 HF1, 11.5.3 HF1, 11.5.3 HF2, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.6.0, 11.6.1, 11.6.2, 11.6.3, 11.6.3.1, 11.6.3.2, 11.6.3.3, 11.6.3.4, 11.6.4, 11.6.5, 11.6.5.1, 11.6.5.2, 11.6.5.3, 12.1.0 HF1, 12.1.0 HF2, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2
Fixed In:
12.0.0, 11.6.0 HF5, 11.5.2, 11.4.1 HF6
Opened: Jan 23, 2014 Severity: 2-Critical Related Article:
K15773
TMM fast forwarded flows are offloaded to ePVA, which is incorrect behavior. The symptom various depending on the FastL4 profile's PVA acceleration setting. If PVA acceleration is set to full, then the connection is established and handled by software (TMM). It is not offloaded to the ePVA. If PVA acceleration is set to guaranteed, then the connection will be reset.
TMM fast forwarded flows are offloaded to ePVA, which is incorrect behavior.
This occurs when a virtual is configured with a FastL4 profile using HW acceleration (ePVA).
For versions 11.3.x and 11.4.0, there is no workaround. On version 11.4.1 or later, you can use the following command to turn off tmm fast forward when using the guaranteed hardware acceleration mode: 'tmsh modify sys db tmm.ffwd.enable value false'.
TMM fast forwarded flows are no longer offloaded to ePVA, which is correct behavior.