Bug ID 722594: TCP flow may not work as expected if double tagging is used

Last Modified: Jul 12, 2023

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

Known Affected Versions:
13.1.0,,,,,,,,, 13.1.1

Fixed In:
14.1.0, 14.0.0,

Opened: May 31, 2018

Severity: 1-Blocking

Related Article: K91300169


TCP flow may have an incorrect ACK number, and the flow may stall or reset. The BIG-IP system sends an ACK that is higher than it should be based on the data received from the client.


TCP connection fails.


Double tagging is used.


Change the db variable tm.tcplargereceiveoffload value to disable.

Fix Information

TCP flow now has the correct ACK number when double tagging is used.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips