Fix kernel version check for TCP_FASTOPEN support#347
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etr merged 2 commits intoetr:masterfrom Jan 27, 2026
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Identify the Bug
#346
Description of the Change
TCP_FASTOPEN should be enabled based on the Linux kernel version. The current implementation is incorrectly evaluating some kernel versions and is failing to correctly handle minor version lower than 7 for major versions greater than 3.
For example, kernel versions 6.1 and 6.6 were incorrectly excluded, even though they do support TCP_FASTOPEN, just because its minor version is lower than 7.
Alternate Designs
None.
Possible Drawbacks
None.
Verification Process
I have used GitHub search engine and git blame command line.
The first commit introducing this kernel version check was authored 10 years ago: a730551
The first commit suggests Kernel 3.6 to support TCP_FASTOPEN, but a newer commit change it to 3.7: 8786b2f
No more related commits.
Release Notes