The F5 BIG-IP appliance must be configured to use TCP when sending log records to the central audit server.

If the default UDP protocol is used for communication between the hosts and devices to the central log server, then log records that do not reach the log server are not detected as a data loss. The use of TCP to transport log records to the log servers improves delivery reliability.

From the BIG-IP GUI: 1. System. 2. Logs. 3. Configuration. 4. Log Destinations. 5. <Name>. 6. Verify "Protocol" is set to TCP.

From the BIG-IP Console, type the following command(s):

tmsh list sys log-config destination remote-high-speed-log <Name> protocol

Note: Verify this is set to "tcp".

If the BIG-IP appliance is not configured to use TCP when sending log records to the central audit server, this is a finding.

From the BIG-IP GUI: 1. System. 2. Logs. 3. Configuration. 4. Log Destinations. 5. Click the name of the log destination. 6. Set "Protocol" to TCP. 7. Click "Update".

From the BIG-IP Console, type the following commands:

tmsh modify sys log-config destination remote-high-speed-log <Name> protocol tcp