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

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:
14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 14.1.2.3, 14.1.2.4, 14.1.2.5, 14.1.2.6, 14.1.2.7, 14.1.2.8, 15.0.0, 15.0.1, 15.0.1.1, 15.0.1.2, 15.0.1.3, 15.0.1.4, 15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 16.0.0, 16.0.0.1

Opened: Jul 20, 2020
Severity: 4-Minor

Symptoms

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.

Impact

Monitors are unstable/not working at all.

Conditions

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

Workaround

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

None

Behavior Change