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linux安全设置

2009-04-22 22:21:52| 分类：《linux服务器》 | 标签： |举报 |字号大中小订阅

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sudo sysctl -e -p /etc/sysctl.conf

sudo sysctl -w net.ipv4.tcp_max_syn_backlog=4096

sudo sysctl -w net.ipv4.tcp_syncookies=1

sudo sysctl -w net.ipv4.tcp_synack_retries=1

sudo sysctl -w net.ipv4.tcp_syn_retries=1

sudo iptables -A FORWARD -p tcp --syn -m limit --limit 1/s -j ACCEPT

sudo iptables -A FORWARD -p tcp --tcp-flags SYN,ACK,FIN,RST RST -m limit --limit 1/s -j ACCEPT

sudo iptables -A FORWARD -p icmp --icmp-type echo-request -m limit --limit 1/s -j ACCEPT

2. iptables的设置，

防止同步包洪水（Sync Flood）

# iptables -A FORWARD -p tcp --syn -m limit --limit 1/s -j ACCEPT

也有人写作

#iptables -A INPUT -p tcp --syn -m limit --limit 1/s -j ACCEPT

--limit 1/s 限制syn并发数每秒1次，可以根据自己的需要修改

防止各种端口扫描

# iptables -A FORWARD -p tcp --tcp-flags SYN,ACK,FIN,RST RST -m limit --limit 1/s -j ACCEPT

Ping洪水攻击（Ping of Death）

# iptables -A FORWARD -p icmp --icmp-type echo-request -m limit --limit 1/s -j ACCEPT

* 用iptables屏蔽IP

iptables -I RH-Lokkit-0-50-INPUT 1 -p tcp -m tcp -s 213.8.166.227 --dport 80 --syn -j REJECT

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