Bug ID 745545: CMP forwarded LRO host packets do not restore LRO flag

Last Modified: Oct 13, 2023

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

Known Affected Versions:,,,, 12.1.4,, 12.1.5,,,, 12.1.6, 14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,,,, 14.1.5,,,,,

Opened: Oct 01, 2018

Severity: 3-Major


When packets are being CMP forwarded for the host (e.g., related connection), the LRO flag is not being restored. As a result, these packets do not go through TSO which results in PMTU response and the connection hangs.


The connection hangs.


This issue is particular to CMP forwarded host connections which are going over the TMM interface due to explicit LRO and large MTU.


There is no workaround.

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips