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

Last Modified: Apr 28, 2025

Affected Product(s):
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

Symptoms

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

Impact

Traffic disrupted while tmm restarts.

Conditions

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

Workaround

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

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips