前言 本文使用packetdrill观测TCP协议的有状态连接管理,并对照RFC793/RFC9293的TCP状态转移图来完成测试用例。测试结果基于Linux 6.4.8。 基本上是一边看RFC一边整理的资料,内容比较零散,看看就好。如有错误还请大佬指出。 RFC9293 2022年发布的RFC9293取代了经典的RFC793,状态转移图也略有差异: +---+ ---\ activ...
画了一张图md mermaid 内容如下```mermaid sequenceDiagram Note left of client: Closed(初始状态...
序列图 (Sequence Diagram) ServerClientServerClientconnectToHostConnection EstablishedsendData("Hello")sendData("Hello, Client")handleResponsedisconnectDisconnection Confirmed 状态图 (State Diagram) connectToHostsendDatareadDatahandleResponseDisconnectedConnectedSendingReceiving 结尾 在这篇文章中,我们系统地讲解了如何...
一、TCP 通信阶段(面向连接) 1.连接建立阶段(三次握手) sequenceDiagram Client->>Server: SYN(seq=x) Server->>Client: SYN-ACK(seq=y, ack=x+1) Client->>Server: ACK(ack=y+1) 关键步骤: 客户端发送SYN(同步序列号) 服务端回应SYN-ACK(确认客户端序列号+1) 客户端发送最终ACK(确认服务端序列号+...
Draw a time sequence diagram of the three-way handshake in your trace, up to and including the first data packet (the HTTP GET request) sent by your computer when the connection is established. Put your computer on the left side and the remote server on the right side. ...
第一次握手:建立连接时,客户端发送syn包(syn=j)到服务器,并进入SYN_SENT状态,等待服务器确认;SYN:同步序列编号(Synchronize Sequence Numbers)。 第二次 第二次握手:服务器收到syn包,必须确认客户的SYN(ack=j+1),同时自己也发送一个SYN包(syn=k),即SYN+ACK包,此时服务器进入SYN_RECV状态; ...
TCP Connection State Diagram +---+ ---\ active OPEN | CLOSED | \ --- +---+<---\ \ create TCB | ^ \ \ snd SYN passive OPEN | | CLOSE \ \ --- | | --- \ \ create TCB | | delete TCB \ \ V | \ \ +---+ CLOSE | \ | LISTEN...
If the counter value does not change by +1, ibaPDA displays a sequence error in the connec- tion list. In the event of an overflow, the counter must jump from 32767 to -32768 (0x7FFF → 0x8000). Issue 2.3 11 Data interface TCP/UDP to SIMATIC S7 ibaPDA-Interface-S7-TCP/UDP 3.2....
TCP/IP一词泛指这些协议，因此，有时也称TCP/IP为网际协议族(Internet Protocol Suite)。
sequenceDiagram Client->>+Server: SYN Server->>+Client: ACK,RST ``` 1. 服务器端口没开 2. 客户端被安全设备禁止访问,可通过TTL字段判断(防火墙Rejected) ### 客户端不响应导致服务器重置 ```mermaid sequenceDiagram Client->>+Server: SYN Server...