1. In its header, each packet also carries the IP address of the final destination. 
   在报头中，每个包也携带最终目的地的ip地址。
2. The temporary header is removed, and the original IP header becomes readable again, allowing the packet to be passed along to its ultimate recipient. 
   临时的报头被去掉，原来的ip报头再次变得可读，让包传到最终的接收者处。
3. This new, readable header is simply the IP address of the security device belonging to the destination site. 
   这个新的可读报头只是属于终点站上安全装置的ip地址。
4. Functioning at the network layer of the Open Systems Interconnection model, the packet-encryption device at the originating site encrypts the entire packet, including the IP header, and provides it with a new header. 
   由于是在“开放系统互连”模型的网络层上起作用的，始发站上的包加密装置对整个包加密，包括ip报头，都提供一个拥有新报头的包。
5. By relying on labels to forward information, MPLS usually doesn't use a packet's IP header unless it is entering or leaving MPLS. 
   由于mpls依靠标签转发信息，它通常不使用包的ip报头，除非它要进入或者离开mpls。

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• 1. 报文头长度
  [计]Internet信报控制协议...ihl ip header length ip报文头长度...HILI High Level Interface Working Group IEEE 802中的高层接口分委员会
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