Bug ID 966681: NAT translation failures while using SP-DAG in a multi-blade chassis

Last Modified: Jan 04, 2022

Bug Tracker

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

Known Affected Versions:
16.0.1, 15.1.2, 15.1.1,

Fixed In:
16.1.0,, 15.1.3, 14.1.4

Opened: Nov 23, 2020
Severity: 3-Major


NAT translation fails


Traffic failure, performance degraded


-- VIPRION multi-blade chassis -- Configure AFM NAT/CGNAT and attach the AFM NAT Policy / lsnpool to the virtual server -- Configure sp-dag on the vlans


Change the DB variable tm.lsn.retries to the maximum value of 4096

Fix Information

Increase the number of attempts in selecting local translation IP (an IP when used makes the return packet to land on the same TMM where the NAT selection is happening). This can be controlled with DB variable tm.lsn.retries. The actual attempts is 16 times the value set in this db variable.

Behavior Change