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Linux下防止被PING

• vi /proc/sys/net/ipv4/icmp_echo_ignore_all 将0改成1这样别人就不能PING自己了,此文件中只有一个0默认情况下。
• vi /proc/sys/net/ipv4/ip_default_ttl 修改自己的TTL值，就可以扰乱HACKER判断你的操作系统类型。

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