Last Modified: Oct 17, 2023
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
10.2.1, 10.2.2, 10.2.3, 10.2.4, 11.2.1, 11.4.1
Fixed In:
11.6.0, 11.5.4 HF2, 11.4.1 HF10
Opened: Apr 24, 2014 Severity: 4-Minor
TCP uses duplicate acks as a sign that data has left the network. When SACK is enabled, the SACK contains better information about this. When SACK indicates no data has left, do not execute duplicate ACK processing.
TCP sends data in excess of what is authorized by the congestion window.
SACK is enabled and duplicate ACKs arrive.
It's a mild performance impact, so no workaround is necessary.
Consider SACK information before dupack processing.