Bug ID 448787: Monitors in non-default route domains may flap when large number of connections are originiated from that route-domain

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:
11.2.1, 11.3.0, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.10

Fixed In:
11.6.0, 11.5.2, 11.4.1 HF9, 11.2.1 HF11

Opened: Feb 12, 2014
Severity: 2-Critical
Related AskF5 Article:


Limiting TCP/IP connections on non-default route domains can cause potential non-default route domain monitor issues.


When the issue occurs, the kern.log reports the following message: 'nf_conntrack: table full, dropping packet', and pool monitors flap intermittently.


This occurs because the rules that provide connection tracking are not picked up in the non-default route-domain upon creation.


Disable connection tracking in non-default route domains.

Fix Information

Connection tracking is now correctly disabled in non-default route domains.

Behavior Change