Last Modified: Sep 13, 2023
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
11.2.1, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.2, 11.5.3, 11.5.4, 11.5.5, 11.5.6, 11.6.0, 11.6.1, 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
Fixed In:
13.0.0, 12.1.2 HF1, 11.6.2, 11.5.7
Opened: Oct 27, 2016 Severity: 2-Critical
TMM crashes
Traffic disrupted while tmm restarts.
All of the below are required to see this behavior: DSACK is enabled MPTCP, rate-pace, tail-loss-probe, and fast-open are disabled. cmetrics-cache-timeout is set to zero; congestion control is high-speed, new-reno, reno, or scalable; AND Nagle is not set to 'auto'. an iRule exists that changes any of the conditions above besides DSACK. various client packet combinations interact in certain ways with the iRule logic.
Change any of the conditions above.
TCP maintains state appropriately to avoid crash.