实验3：可靠数据传输协议-GBN协议的设计与实现

1、.实验3：可靠数据传输协议-GBN协议的设计与实现1.实验目的理解滑动窗口协议的基本原理；掌握GBN的工作原理；掌握基于UDP设计并实现一个GBN协议的过程与技术。2.实验环境接入Internet的实验主机；Windowsxp或Windows7/8；开发语言：C/C+（或Java）等。3.实验内容1)基于UDP设计一个简单的GBN协议，实现单向可靠数据传输（服务器到客户的数据传输）。2)模拟引入数据包的丢失，验证所设计协议的有效性。3)改进所设计的GBN协议，支持双向数据传输； 4.实验设计1)Client:函数列表：各函数功能：函数名传入参数功能client_GBN_5sentence：须发

2、送的内容客户端主函数PACKERsentence：须打包的内容data_len：每包默认长度把要发送的内容按照默认长度进行打包，返回数据包列表与数据包格式senderpl：数据包列表fmt：数据包格式nextseqnum：下一序列号base：基序列号recvernextseqnum：下一序列号base：基序列号状态转换图：2)Server:状态转换图：3)数据包结构:发送方：数据包包括序列号与内容接收方：只含接收到的数据包的序号5.实验结果1)Client:2)Server:详细对照：CLIENTSERVER确定服务器与客户端地址、接口socket: (127.0.0.1, 50000) bi

3、ndedclient: (127.0.0.1, 50000)server: (127.0.0.1, 50001)socket: (127.0.0.1, 50)client: (127.0.0.1, 50)server: (127.0.0.1, 50)准备发送的文本序列：bx00x00x00x00I am the bone of my , bx01x00x00x00sword.Steel is my bo, bx02x00x00x00dy, and fire is my b, bx03x00x00x00lood.I have created , bx04x00x00x00over a thous

4、and blad, bx05x00x00x00es.Unknown to Death, bx06x00x00x00Nor known to Life.Ha, bx07x00x00x00ve with stoodpain t, bx08x00x00x00o create many weapon, btx00x00x00s.Yet,those hands wi, bnx00x00x00ll never hold anythi, bx0bx00x00x00ng.So as I pray, Unl, bx0cx00x00x00imited Blade Worksx00x00进行收发start time

5、rgo to next packetrecver: go on!base: 0start timergo to next packetrecver: go on!base: 1start timergo to next packetrecver: go on!base: 2start timergo to next packetrecver: go on!base: 3start timergo to next packetrecver: go on!base: 4start timergo to next packetrecver: go on!base: 5start timergo to

6、 next packetrecver: go on!base: 6start timergo to next packetrecver: go on!base: 7start timergo to next packetrecver: go on!base: 8start timergo to next packetrecver: go on!base: 9start timergo to next packetrecver: go on!base: 10start timergo to next packetrecver: go on!base: 11start timergo to nex

7、t packet0 I am the bone of mybx00x00x00x001 sword.Steel is my bobx01x00x00x002 dy, and fire is my bbx02x00x00x003 lood.I have createdbx03x00x00x004 over a thousand bladbx04x00x00x005 es.Unknown to Death,bx05x00x00x006 Nor known to Life.Habx06x00x00x007 ve with stood pain tbx07x00x00x008 o create many weaponbx08x00x00x009 s.Yet,those hands wibtx00x00x0010 ll never hold anythibnx00x00x0011 ng.So as I pray, Unlbx0bx00x00x0012 imited Blade Works发送完成时，直接结束。超时两次后结束。此处不另设结束信号。SENDER:FINISHEDRECVER:F