From c36b8e25f20159e12466f672e15fe50096fab0ac Mon Sep 17 00:00:00 2001
From: root <root@localhost.fisher>
Date: Mon, 26 Nov 2018 14:28:01 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0=E9=98=B2=E6=AD=A2SYN=20flood?=
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	修改：      mail搭建公司邮箱/公司邮箱搭建.md
Signed-off-by: root <root@localhost.fisher>
---
 mail-doc/mail搭建公司邮箱/公司邮箱搭建.md | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/mail-doc/mail搭建公司邮箱/公司邮箱搭建.md b/mail-doc/mail搭建公司邮箱/公司邮箱搭建.md
index 20e9dd4..45526fc 100644
--- a/mail-doc/mail搭建公司邮箱/公司邮箱搭建.md
+++ b/mail-doc/mail搭建公司邮箱/公司邮箱搭建.md
@@ -1995,6 +1995,21 @@ mynetworks = 127.0.0.0/8 127.0.0.1 172.17.201.0/24 172.16.0.0/24 172.31.255.0/24
 
 2. 成都方面说通过重启路由器恢复正常
 
+## 8.5 SYN flooding引发网络故障
+
+1. 修改/etc/sysctl.conf配置
+
+```
+net.ipv4.tcp_max_syn_backlog = 4096
+net.ipv4.tcp_syn_retries = 2
+
+```
+2. 生效配置
+
+```
+sysctl -p
+
+```
 
 # 9 参考网址