計算機網(wǎng)絡實驗可靠數(shù)據(jù)傳輸協(xié)議GBN協(xié)議的設計與實現(xiàn)

1、實驗3：可靠數(shù)據(jù)傳輸協(xié)議-GBN協(xié)議的設計與實現(xiàn)1.實驗目的理解滑動窗口協(xié)議的基本原理；掌握 GBN 的工作原理；掌握基于UDP 設計并實現(xiàn)一個 GBN 協(xié)議的過程與技術(shù)。2.實驗環(huán)境Ø 接入 Internet 的實驗主機；Ø Windows xp 或 Windows 7/8；Ø 開發(fā)語言：C/C+（或 Java）等。3.實驗內(nèi)容1) 基于 UDP 設計一個簡單的 GBN

2、60;協(xié)議，實現(xiàn)單向可靠數(shù)據(jù)傳輸（服務器到客戶的數(shù)據(jù)傳輸）。2) 模擬引入數(shù)據(jù)包的丟失，驗證所設計協(xié)議的有效性。3) 改進所設計的 GBN 協(xié)議，支持雙向數(shù)據(jù)傳輸； 4.實驗設計1) Client:函數(shù)列表：各函數(shù)功能：函數(shù)名傳入?yún)?shù)功能client_GBN_5sentence：須發(fā)送的內(nèi)容客戶端主函數(shù)PACKERsentence：須打包的內(nèi)容data_len：每包默認長度把要發(fā)送的內(nèi)容按照默認長度進行打包，返回數(shù)據(jù)包列表與數(shù)據(jù)包格式senderpl：數(shù)據(jù)包列表fmt：數(shù)據(jù)包格式nextseqnum：下一序列號base：基序列號recverne

3、xtseqnum：下一序列號base：基序列號狀態(tài)轉(zhuǎn)換圖：2) Server:狀態(tài)轉(zhuǎn)換圖：3) 數(shù)據(jù)包結(jié)構(gòu):發(fā)送方：數(shù)據(jù)包包括序列號與內(nèi)容接收方：只含接收到的數(shù)據(jù)包的序號5.實驗結(jié)果1) Client:2) Server:詳細對照：CLIENTSERVER確定服務器與客戶端地址、接口socket: ('127.0.0.1', 50000) bindedclient: ('127.0.0.1', 50000)server: ('127.0.0.1', 50001)socket: ('127.0.0.1

4、', 50)client: ('127.0.0.1', 50)server: ('127.0.0.1', 50)準備發(fā)送的文本序列：b'x00x00x00x00I am the bone of my ', b'x01x00x00x00sword.Steel is my bo', b'x02x00x00x00dy, and fire is my b', b'x03x00x00x00lood.I have created ', b'x04x00x00x00over a thousand

5、blad', b'x05x00x00x00es.Unknown to Death,', b'x06x00x00x00Nor known to Life.Ha', b'x07x00x00x00ve with stoodpain t', b'x08x00x00x00o create many weapon', b'tx00x00x00s.Yet,those hands wi', b'nx00x00x00ll never hold anythi', b'x0bx00x00x00ng.So

6、as I pray, Unl', b'x0cx00x00x00imited Blade Worksx00x00'進行收發(fā)start timergo 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 packetrecv

7、er: go on!base: 4start timergo to next packetrecver: go on!base: 5start timergo to 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

8、 on!base: 10start timergo to next packetrecver: go on!base: 11start timergo to next packet0 I am the bone of myb'x00x00x00x00'1 sword.Steel is my bob'x01x00x00x00'2 dy, and fire is my bb'x02x00x00x00'3 lood.I have createdb'x03x00x00x00'4 over a thousand bladb'x04x

9、00x00x00'5 es.Unknown to Death,b'x05x00x00x00'6 Nor known to Life.Hab'x06x00x00x00'7 ve with stood pain tb'x07x00x00x00'8 o create many weaponb'x08x00x00x00'9 s.Yet,those hands wib'tx00x00x00'10 ll never hold anythib'nx00x00x00'11 ng.So as I pray, Unlb'x0bx00x00x00'12 imited Blade Works發(fā)送完成時，直接結(jié)束。超時兩次后結(jié)束。此處不另設結(jié)束信號。SENDER:FINI