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Subjecttcp_ecn is an integer not a boolean

There was some confusion at LCA as to why the sysctl tcp_ecn took one
of three values when it was documented as a Boolean. This patch fixes
the documentation.

Signed-off-by: Peter Chubb <>

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index d99940d..ac3b4a7 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -187,7 +187,7 @@ tcp_cookie_size - INTEGER
tcp_dsack - BOOLEAN
Allows TCP to send "duplicate" SACKs.

-tcp_ecn - BOOLEAN
+tcp_ecn - INTEGER
Enable Explicit Congestion Notification (ECN) in TCP. ECN is only
used when both ends of the TCP flow support it. It is useful to
avoid losses due to congestion (when the bottleneck router supports
Dr Peter Chubb peter DOT chubb AT ERTOS within National ICT Australia
All things shall perish from under the sky/Music alone shall live, never to die

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