Bug ID 530505: IP fragments can cause TMM to crash when packet filtering is enabled

Last Modified: Jul 26, 2021

Bug Tracker

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

Known Affected Versions:
11.6.0, 11.5.3, 11.5.2, 11.5.1, 11.5.1, 11.5.1, 11.5.1, 11.5.1, 11.4.1, 11.2.1, 10.2.4, 10.2.4

Fixed In:
12.0.0, 11.6.1, 11.5.4, 11.4.1 HF10

Opened: Jun 29, 2015
Severity: 2-Critical
Related AskF5 Article:
K01020491

Symptoms

TMM can crash when an IP fragment is received and packet filtering is enabled.

Impact

Traffic disrupted while tmm restarts.

Conditions

This issue can occur when packet filtering is enabled and an IP fragment is received on the non-owning TMM. To determine if packet filtering is enabled, then the packetfilter setting can be queried by using the 'tmsh list sys db packetfilter' command.

Workaround

Disable packet filtering.

Fix Information

When packet filtering is enabled and an IP fragment is received on the non-owning TMM, TMM forwards the IP fragment without issue.

Behavior Change