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#Ping洪水攻击(Ping of Death)
iptables -A FORWARD -p icmp –icmp-type echo-request -m limit –limit 1/s -j ACCEPT
#防止同步包洪水(Sync Flood)
iptables -A FORWARD -p tcp –syn -m limit –limit 1/s -j ACCEPT
#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
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原文地址:http://www.cnblogs.com/dantes91/p/5007982.html