Bug ID 717831: TCP4 stack is not supported anymore

Last Modified: Jan 20, 2023

Bug Tracker

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

Known Affected Versions:
14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,,,, 14.1.5,,,, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5,, 15.1.6,, 15.1.7, 15.1.8,

Fixed In:

Opened: May 01, 2018
Severity: 3-Major


Starting from this release, TMM maintain only one TCP stack (TCP) instead of two (TCP4 and TCP). In the last few BIG-IP versions, TCP stack has already been the default stack. TCP4 stack will not be supported going forward. This enables better maintenance. Mirroring between an older version of BIG-IP and versions going forward will be functional if both BIG-IP systems use the TCP stack.


TCP4 stack is not supported.


For maintenance purposes, the number of TCP stacks is being reduced to one.



Fix Information

TCP4 stack is not supported anymore.

Behavior Change