Fw: [Bug 221665] New: tcp_ecn: doc says default is 2, but should be 5

Fw: [Bug 221665] New: tcp_ecn: doc says default is 2, but should be 5

[Stephen Hemminger]

Begin forwarded message:

Date: Thu, 18 Jun 2026 13:05:29 +0000
From: bugzilla-daemon@kernel.org
To: stephen@networkplumber.org
Subject: [Bug 221665] New: tcp_ecn: doc says default is 2, but should be 5


https://bugzilla.kernel.org/show_bug.cgi?id=221665

            Bug ID: 221665
           Summary: tcp_ecn: doc says default is 2, but should be 5
           Product: Networking
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: IPV4
          Assignee: stephen@networkplumber.org
          Reporter: pedretti.fabio@gmail.com
                CC: corbet@lwn.net, pabeni@redhat.com
        Regression: No

Here: https://docs.kernel.org/networking/ip-sysctl.html#:~:text=tcp_ecn

tcp_ecn - INTEGER
...
Default: 2


However it looks like the default was recently changed:

"In previous kernels, the value of tcp_ecn is, by default, two, [...] The new
default value is five, [...]"

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8ae3e8e6ceedfb3cf74ca18169c942e073586a39

Please address this.
Thanks.

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