Bug ID 1063453: FastL4 virtual servers translating between IPv4 and IPv6 may crash on fragmented packets.

Last Modified: May 29, 2024

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6

Fixed In:
17.0.0, 16.1.2.2, 15.1.6.1, 14.1.5

Opened: Nov 22, 2021

Severity: 3-Major

Symptoms

Tmm crashes while passing IPv4-to-IPv6 traffic over FastL4.

Impact

All traffic is disrupted while the TMM restarts.

Conditions

-- A FastL4 virtual server translates between IPv4 and IPv6. -- Fragment reassembly is not enabled in the FastL4 profile. -- A feature requiring asynchronous completion is configured including: asynchronous irules on LB events (LB_SELECTED, LB_FAILED, LB_PERSIST_DOWN, LB_QUEUED, SA_PICKED), persistence, sessiondb operations, HA, virtual rate limiting.

Workaround

Configure the FastL4 profile to always reassemble fragments.

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips