Bug ID 666494: Refine PUSH flag settings for sub MSS packets

Last Modified: Aug 08, 2019

Bug Tracker

Affected Product:  See more info
BIG-IP LTM(all modules)

Known Affected Versions:
13.1.0,,,,,,,,, 13.1.1,,,,,, 13.1.3

Fixed In:

Opened: May 25, 2017
Severity: 3-Major


Currently, in Auto mode, PUSH flag is set based on the application/network conditions. The system should instead append a PUSH flag to sub-MSS TCP segments (except 0 length pure ACK) to PUSH small segments faster to the receiving application in auto mode.


Non HTTP applications receive small segments slower if PUSH Flag is not present in sub-MSS TCP segments.


Non HTTP applications sending sub MSS packets.



Fix Information

In Auto Mode, last sub-MSS TCP segments are always appended with PUSH flag.

Behavior Change