A TCP connection progresses through a series of states during its lifetime. The following diagram illustrates the possible states for a TCP connection and how the states transition based on various events from either the network or from the local TCP sockets application.
Figure 1. TCP state transition diagram
TCP State Table
| TCP connection state | Description |
|---|---|
| LISTEN | Waiting for a connection request from a remote TCP application. This is the state in which you can find the listening socket of a local TCP server. |
| SYN-SENT | Waiting for an acknowledgment from the remote endpoint after having sent a connection request. Results after step 1 of the three-way TCP handshake. |
| SYN-RECEIVED | This endpoint has received a connection request and sent an acknowledgment. This endpoint is waiting for final acknowledgment that the other endpoint did receive this endpoint’s acknowledgment of the original connection request. Results after step 2 of the three-way TCP handshake. |
| ESTABLISHED | Represents a fully established connection; this is the normal state for the data transfer phase of the connection. |
| FIN-WAIT-1 | Waiting for an acknowledgment of the connection termination request or for a simultaneous connection termination request from the remote TCP. This state is normally of short duration. |
| FIN-WAIT-2 | Waiting for a connection termination request from the remote TCP after this endpoint has sent its connection termination request. This state is normally of short duration, but if the remote socket endpoint does not close its socket shortly after it has received information that this socket endpoint closed the connection, then it might last for some time. Excessive FIN-WAIT-2 states can indicate an error in the coding of the remote application. |
| CLOSE-WAIT | This endpoint has received a close request from the remote endpoint and this TCP is now waiting for a connection termination request from the local application. |
| CLOSING | Waiting for a connection termination request acknowledgment from the remote TCP. This state is entered when this endpoint receives a close request from the local application, sends a termination request to the remote endpoint, and receives a termination request before it receives the acknowledgment from the remote endpoint. |
| LAST-ACK | Waiting for an acknowledgment of the connection termination request previously sent to the remote TCP. This state is entered when this endpoint received a termination request before it sent its termination request. |
| TIME-WAIT | Waiting for enough time to pass to be sure the remote TCP received the acknowledgment of its connection termination request. |
| CLOSED | Represents no connection state at all. |
原文地址：http://www.cnblogs.com/zy09/p/16884826.html
1. 本站所有资源来源于用户上传和网络，如有侵权请邮件联系站长！
2. 分享目的仅供大家学习和交流，请务用于商业用途!
3. 如果你也有好源码或者教程，可以到用户中心发布，分享有积分奖励和额外收入！
4. 本站提供的源码、模板、插件等等其他资源，都不包含技术服务请大家谅解！
5. 如有链接无法下载、失效或广告，请联系管理员处理！
6. 本站资源售价只是赞助，收取费用仅维持本站的日常运营所需！
7. 如遇到加密压缩包，默认解压密码为"gltf",如遇到无法解压的请联系管理员！
8. 因为资源和程序源码均为可复制品，所以不支持任何理由的退款兑现，请斟酌后支付下载
声明：如果标题没有注明"已测试"或者"测试可用"等字样的资源源码均未经过站长测试.特别注意没有标注的源码不保证任何可用性
