path: root/Documentation/networking/ip-sysctl.txt
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Diffstat (limited to 'Documentation/networking/ip-sysctl.txt')
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index b1c6500e7a8d..974ab47ae53a 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -602,6 +602,14 @@ tcp_fastopen - INTEGER
Note that that additional client or server features are only
effective if the basic support (0x1 and 0x2) are enabled respectively.
+tcp_fastopen_blackhole_timeout_sec - INTEGER
+ Initial time period in second to disable Fastopen on active TCP sockets
+ when a TFO firewall blackhole issue happens.
+ This time period will grow exponentially when more blackhole issues
+ get detected right after Fastopen is re-enabled and will reset to
+ initial value when the blackhole issue goes away.
+ By default, it is set to 1hr.
tcp_syn_retries - INTEGER
Number of times initial SYNs for an active TCP connection attempt
will be retransmitted. Should not be higher than 127. Default value