Knowing this, imagine that an attacker constructs an ICMP echo message containing the spoofed source address of some arbitrary Host a, such as 192.168.2.2, in its header.

知道了这一点，假设攻击者构造了一条IC MP回应消息，它的头中包含伪造的任意主机a的源地址，如192.168.2.2。

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If the gateway processing a datagram determines that the time to live field in the datagram's IP header is 0, it discards the datagram and notifies the sending host with a time Exceeded Message.

如果处理数据报的网关测定该数据报i p头中的生存时间字段为0，则丢弃该数据报并用超时消息通知源主机。

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Because setting the HTTP Host header is a standard step in using an HTTP proxy, very little additional work is needed to get the proxy server to forward the traffic properly.

因为设置HTTP host头是使用HTTP代理的标准步骤，让代理服务器正确的转发消息只需要很少的额外工作。

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