Bug ID 1232957: Invalid L4 checksum packet drop in ATSE

Last Modified: May 29, 2024

Affected Product(s):
F5OS F5OS-C(all modules)

Known Affected Versions:
F5OS-C 1.5.1

Fixed In:
F5OS-C 1.6.0

Opened: Feb 01, 2023

Severity: 1-Blocking


Small number of L4 checksum drops reported in NETC_L4C_DRPS counters on all 4 NETC lanes. The L4 checksum drops were found to be invalid.


Small number of valid packets are dropped.


This can happen any time L4 checksum validation FPGA offload is enabled.


Logic issue was fixed in this bitfile update. Refer to Bug ID 1259493.

Fix Information

There was a flow control logic issue in the pipeline among the modules in the VQF FPGA. The logic is fixed in Bitfile v8.9.5.9 and all the new VQF bitfiles.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips