Bug ID 1325681: VLAN tscookies with fastl4 timestamp preserve and PVA acceleration cause connection problems.

Last Modified: Dec 28, 2023

Affected Product(s):
BIG-IP AFM(all modules)

Known Affected Versions:
15.1.9, 15.1.9.1, 15.1.10, 15.1.10.2, 15.1.10.3, 16.1.0, 16.1.1, 16.1.2, 16.1.2.1, 16.1.2.2, 16.1.3, 16.1.3.1, 16.1.3.2, 16.1.3.3, 16.1.3.4, 16.1.3.5, 16.1.4, 16.1.4.1, 16.1.4.2, 17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1

Opened: Jul 27, 2023

Severity: 3-Major

Symptoms

Some connections might be reset by the client or server when VLAN timestamp cookies are configured.

Impact

Unexpected flow RSTs from client/server due to incorrect timestamp echo received from BIG-IP.

Conditions

-- Flow accelerated in PVA. -- VLAN timestamp cookies configured for one side of the connection. -- Bigproto timestamp preserve option (default). -- Client and server sending timestamps.

Workaround

Either: - Set fastL4 profile option 'tcp-pva-whento-offload' to 'establish' OR - Disable VLAN timestamp cookies. OR - Change Bigproto timestamp option to rewrite (this disables PVA acceleration in a process).

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips