Bug ID 928665: Kernel nf_conntrack table might get full with large configurations.

Last Modified: Sep 23, 2021

Bug Tracker

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

Known Affected Versions:
14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4, 16.0.0,, 16.0.1,,, 16.1.0

Opened: Jul 20, 2020
Severity: 4-Minor


Linux host connections are unreliable, and you see warning messages in /var/log/kern.log: warning kernel: : [182365.380925] nf_conntrack: table full, dropping packet.


Monitors are unstable/not working at all.


This can occur during normal operation for configurations with a large number of monitors, for example, 15,000 or more active entries.


1. Modify /etc/modprobe.d/f5-platform-el7-conntrack-default.conf increasing the hashsize value: options nf_conntrack hashsize=262144 2. Save the file. 3. Reboot the system.

Fix Information


Behavior Change