Last Modified: Apr 10, 2019
See more info
Known Affected Versions:
12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2
Opened: Jul 22, 2016
Related AskF5 Article: K52231531
When the /sys db tm.simultaneousopen variable is set to 'reset' or 'drop_connection', TMM may crash during a TCP simultaneous 4 way handshake.
Traffic disrupted while tmm restarts.
1. The /sys db tm.simultaneousopen variable is set to 'reset' or 'drop_connection'. 2. A TCP 4 way handshake (simultaneous open) occurs as described in RFC 793.
The crash can be avoided, while still mitigating TCP 4 way handshakes, by setting the /sys db tm.simultaneousopen variable to 'drop_pkt'.