Bug ID 937649: Flow fwd broken with statemirror.verify enabled and source-port preserve strict

Last Modified: Sep 16, 2020

Bug Tracker

Affected Product:  See more info
BIG-IP LTM(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, 15.0.0, 15.0.1, 15.0.1.1, 15.0.1.2, 15.0.1.3, 15.0.1.4, 15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 16.0.0, 16.0.0.1

Opened: Aug 18, 2020
Severity: 2-Critical

Symptoms

Flow forwarding does not work with statemirror.verify enabled and source-port is preserve strict. Depending on the number of tmms and the IP addresses/ports on the network, this causes return traffic to get dropped. Traffic captures show packets leaving the BIG-IP system on one tmm and being returned on another. The return traffic that encounters the second tmm is dropped.

Impact

Server-side return traffic to the BIG-IP is dropped. This causes connection timeouts and resets.

Conditions

-- Mirroring is enabled. -- High availability (HA) peer is connected. -- The source-port setting is preserve-strict. -- The statemirror.verify option is enabled. -- There is more than one tmm.

Workaround

-- Disable statemirror.verify, disable source-port preserve-strict, disable mirroring. -- On BIG-IP Virtual Edition (VE), add the following to tmm_init.tcl on both units and restart tmm: ndal ignore_hw_dag yes

Fix Information

None

Behavior Change