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-rw-r--r--Documentation/networking/ip-sysctl.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 53cea9bcb14c..36be26b2ef7a 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -440,6 +440,10 @@ tcp_syncookies - BOOLEAN
SYN flood warnings in logs not being really flooded, your server
is seriously misconfigured.
+ If you want to test which effects syncookies have to your
+ network connections you can set this knob to 2 to enable
+ unconditionally generation of syncookies.
+
tcp_fastopen - INTEGER
Enable TCP Fast Open feature (draft-ietf-tcpm-fastopen) to send data
in the opening SYN packet. To use this feature, the client application