Last Modified: Sep 13, 2023
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
11.3.0, 11.4.0, 11.4.1, 11.6.0, 12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2
Fixed In:
12.1.0, 11.6.1, 11.5.4 HF2
Opened: Feb 05, 2015 Severity: 3-Major Related Article:
K13627243
Sending unsolicited ACK to a virtual server increments the counter 'Total Software Rejected' from tmsh show ltm virtual 'name_of_virtual_server' when syn cookie status is not activated.
Potentially inaccurate statistics in tmsh show ltm virtual.
This has been observed under the following conditions: 1. The client sends a SYN, the LTM sends an SYN/ACK and then the client sends a bad ACK. 2. A client sends an ACK for a connection that does not exist in the connection table (either it never existed or had been closed).
None.
In this release, the system increments the syncookie reject stat only if a bad ACK could correspond to a syncookie the system issued.