| 1. | Class holds the data contained in an ip datagram packet
类保存了ip数据报包中包含的数据。 |
| 2. | For protecting the safety of ip datagram , ipsec is present the mainstream network layer ' s safe mechanism
对于保护ip数据报的安全而言， ipsec是目前主流的网络层安全机制。 |
| 3. | Like the ip datagram , the tcp segment consists of a header portion , an optional options section , and the data portion
与ip数据报类似， tcp段包含头部分、可选（选项）部分和数据部分。 |
| 4. | The ietf s security additions specifications providing for authentication , integrity , and privacy services at the ip datagram layer
为ip数据报层上的认证、完整性和保密性服务提供的ietf ( tm )安全性附加规范。 |
| 5. | The icmp echo request failed because the destination ip address cannot receive icmp echo requests or should never appear in the destination address field of any ip datagram
由于目标ip地址无法收到icmp回送请求或者永远都不应当出现在任何ip数据报的目标地址字段中， icmp回送请求失败。 |
| 6. | Every ip datagram contains a field in its header - called a " time to live field " - which indicates how much longer the datagram is to remain on the internet before it is discarded
每个ip数据报头中都包含一个字段称为“生存时间字段”它指出数据报在被丢弃之前还能在因特网上保持多久。 |
| 7. | Section one , we illuminate the conception of multicast . ip multicasting is the transmission of an ip datagram to a " host group " , the datagram is not guaranteed to arrive intact at all members of the destination group or in the same order relative to other datagrams
第一部分介绍组播相关概念。组播是基于udp数据报方式的，非面向连接的一种网络数据发送方式，组播是rtp rtcp数据传输的基础。 |
| 8. | Finally we analized the aes algorithm and its application in ipsec protocol . ( 2 ) because the communication of ip datagram has charaisteristics of itself , we analized the influence that ip datagram communication does on encryption modes , and put forward some design rules
( 2 )加密技术的安全性不但和算法有关，而且和密码模式也有关，一种模式在这个环境中是安全的，在另外一个环境可能容易受到攻击。 |
| 9. | In the research of secure communication , the thesis analyzes some shortcomings of diffie - hellman ' s crypt key exchanging protocol , presenting a new exchanging method based on the " station to station " protocol and cookie mechanism , realizing the software of crypt key exchanging and secure communication of ip datagram on router
在对安全通信的研究中，本文分析了diffie - hellman密钥交换协议中易受攻击的地方，提出了基于端对端协议及cookie机制的密钥交换新方法，并在路由器上实现了密钥交换和ip报文的安全通信。 |
