Last Modified: Jan 20, 2023
See more info
Known Affected Versions:
16.1.0, 16.1.1, 16.1.2, 184.108.40.206, 220.127.116.11, 16.1.3, 18.104.22.168, 22.214.171.124, 126.96.36.199
Opened: Apr 09, 2020
If a TCP profile is configured with a syn-rto-base value that is lower than minimum-rto, the first retransmission might happen after syn-rto-base. This behavior is encountered only if the BIG-IP system is unable to compute the new RTO value before the retransmission timer expires, meaning: -- The BIG-IP system has not received a packet with a TCP timestamp reply. -- The BIG-IP system has not received an ACK for a timed sequence number.
Retransmission might happen sooner than expected.
Configured value of syn-rto-base is lower than minimum-rto.
There are two possible workarounds: -- Avoid using a syn-rto-base value that is lower than the minimum-rto value (the default values are 3 seconds for syn-rto-base and 1 second for minimum-rto). -- Consider enabling timestamps to allow faster RTT measurement.