tcp: doc : fix the syncookies default value

syncookies is on for default since in commit e994b7c901
(tcp: Don't make syn cookies initial setting depend on CONFIG_SYSCTL).

And fix a typo of CONFIG_SYN_COOKIES.

Signed-off-by: Shan Wei <davidshan@tencent.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index f98ca63..3458d63 100644 (file)
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -420,10 +420,10 @@ tcp_synack_retries - INTEGER
        for a passive TCP connection will happen after 63seconds.
 
 tcp_syncookies - BOOLEAN
        for a passive TCP connection will happen after 63seconds.
 
 tcp_syncookies - BOOLEAN

-       Only valid when the kernel was compiled with CONFIG_SYNCOOKIES
+       Only valid when the kernel was compiled with CONFIG_SYN_COOKIES

        Send out syncookies when the syn backlog queue of a socket
        overflows. This is to prevent against the common 'SYN flood attack'
        Send out syncookies when the syn backlog queue of a socket
        overflows. This is to prevent against the common 'SYN flood attack'

-       Default: FALSE
+       Default: 1

 
        Note, that syncookies is fallback facility.
        It MUST NOT be used to help highly loaded servers to stand
 
        Note, that syncookies is fallback facility.
        It MUST NOT be used to help highly loaded servers to stand