Bug ID 726176: platforms using RSS DAG hash reuse source port too rapidly when the FastL4 virtual server is set to source-port preserve

Last Modified: Oct 28, 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,, 15.0.0, 15.0.1

Opened: Jun 29, 2018
Severity: 3-Major


The BIG-IP system running RSS DAG hash attempts to reuse ports while pool members remain in a TIME_WAIT state and are unable to process new connections.


Traffic throughput may be degraded.


This issue occurs when all of the following conditions are met: -- You are running on a BIG-IP platform using RSS DAG hash, for instance, z100 and 2000 or 4000 series hardware platform. -- You have the FastL4 profile associated with a virtual server. -- The virtual server is configured with source-port preserve.


Set source-port to change.

Fix Information


Behavior Change