From: Stephen Hemminger <stephen@networkplumber.org>
To: netdev@vger.kernel.org
Subject: Fw: [Bug 221665] New: tcp_ecn: doc says default is 2, but should be 5
Date: Thu, 18 Jun 2026 08:52:58 -0700 [thread overview]
Message-ID: <20260618085258.2d7ccb8a@phoenix.local> (raw)
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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