Bug ID 740963: VIP-targeting-VIP traffic can cause TCP retransmit bursts resulting in tmm restart

Last Modified: Sep 13, 2023

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

Known Affected Versions:
12.1.2, 12.1.3,,,,,,,, 12.1.4,, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0,,,,,,,,, 13.1.1,,, 14.0.0,,,,

Fixed In:
14.1.0,,, 12.1.5

Opened: Aug 17, 2018

Severity: 2-Critical


VIP-on-VIP traffic might cause TCP retransmit bursts, which in certain situations can cause tmm to restart.


Temporary memory consumption and potential for tmm to restart. Traffic disrupted while tmm restarts.


- Virtual server handling TCP traffic. - iRule using the 'virtual' command.



Fix Information

TCP retransmit bursts are now handled gracefully.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips