Bug ID 545783: TMM crashes when forwarding an inbound connection on Large Scale NAT (LSN) pool

Last Modified: Nov 07, 2022

Bug Tracker

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

Known Affected Versions:
11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 12.0.0, 12.0.0 HF1, 12.0.0 HF2

Fixed In:
12.1.0, 12.0.0 HF3, 11.6.1

Opened: Sep 14, 2015
Severity: 2-Critical


TMM crashes when forwarding an inbound connection and the flow sweeper tries to update the flow before the forwarding operation completes.


Traffic disrupted while tmm restarts.


A small or over utilized LSN pool that creates inbound entries that require forwarding.


Add more IP addresses to the LSN pool.

Fix Information

TMM no longer crashes when forwarding inbound connections configured with an LSN pool

Behavior Change