Bug ID 424042: Virtual Edition instances with TSO enabled may drop packets

Last Modified: Jul 12, 2023

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

Known Affected Versions:
11.3.0, 11.4.0

Fixed In:
11.5.0, 11.4.1

Opened: Jun 26, 2013

Severity: 2-Critical


VE instances with TCP Segmentation Offload (TSO) enabled may drop packets. These packet drops are not recorded in tmstat tables, and are instead counted by the VE dataplane driver's statistics interface (see 'tx_tso_errcnt' in /proc/unic)


Packets can be dropped by the VE dataplane driver. These drops are not recorded in tmstat tables.


VE instance with TSO enabled on Xen, VMware, and KVM hypervisors


Disable TSO "tmsh modify sys db tm.tcpsegmentationoffload value disable"

Fix Information

Correct TSO checksum calculation for VE guests

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips