ack message

In the TCP protocol Before the communication has to go through three times handshake, the requester sends out a SYN signal request connection, the other party receives and accepts when will send an ACK message.An ACK is the meaning of a response.

ACK message reflectionCode Author: Xiaojin # Include # Include # Define false 0# Define true 1 # Define seq 0x28376839 Int x =-1, K, J;Int rndx = 0; Struct IP{Char IP [20];}; Struct IP iptemp [32767]; Typedef struct ip_hdr //

Note: There is no explicit correspondence between active, passive and server, client. This figure n many people know that it helps to troubleshoot and locate network or system failures, but how do you keep this picture in mind? Then you must have a

I. Introduction to the TCP protocolTCP, full name transfer Control Protocol, the Chinese name is the transmission protocol, it works in the OSI Transport layer, providing reliable connection-oriented transport services.The main task of TCP is to

It helps to troubleshoot and locate networks or systems, but how do you keep this picture in your head? Then you must have a deep understanding of each state of the graph, and the process of conversion, and not just stay in the smattering. Here is a

2, all 11 kinds of states2.1, the Client Exclusive: (1) syn_sent (2) fin_wait1 (3) fin_wait2 (4) CLOSING (5) time_wait.2.2, the server unique: (1) LISTEN (2) SYN_RCVD (3) close_wait (4) Last_ack.2.3, the total: (1) CLOSED (2) established.TCP State

TCP establishes three handshake processes for connections, and four handshake processes for closing connections.TCP establishes three handshake processes for connections, and four handshake processes for closing connections.1. Establish Connection

For peacetime I need to observe the TCP connection between LVS and client and RS, you need to get a closer look at the four handshake that establishes the connected TCP three handshake and closes the connection, for example, do you know what these

The image above is helpful in troubleshooting and locating a network or system, but how to engrave the image in the brain. Then you must have a deep understanding of each state of the graph, and the process of conversion, and not just stay in the

　The TCP creation process and the link dismantling process are created automatically by the TCP/IP protocol stack relative to the socket developer. Therefore, the developer does not need to control this process. But it is quite helpful to understand

Troubleshoot excessive number of TCP connectionsTCP state Migration, Close_wait & Fin_wait2 IssuesTCP State MigrationEveryone to netstat-a command very familiar, but, you have not noticed the state of a column, basically shows the

　　1 SYN Flood attack Introduction: Denial of service attack (denial of Service,dos) is a more effective and very difficult way to defend a network attack, and its purpose is to prevent servers from serving normal users. As a result, DOS poses a

Note: There is no explicit correspondence between active, passive and server, client. This figure n many people know that it helps to troubleshoot and locate network or system failures, but how do you keep this picture in mind? Then you must have a

http://blog.csdn.net/dotnetpig/article/details/6776999 Recently interviewed a lot of companies, in addition to Baidu, other companies Taobao etc will ask you TCP three handshake in the end is what, why is three times shaking hands instead of four

This figure n many people know that it helps to troubleshoot and locate network or system failures, but how to firmly engrave this picture in the brain. Then you must have a deep understanding of each State of the map and the process of conversion,

First, TCP state transition diagramThe operation of TCP involving connection establishment and connection termination can be explained by the state Transition diagram (transition diagram):650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M00/76

The TCP/IP protocol workflow is as follows: On the source host, the application layer transmits a string of application data to the transport layer. The transport layer truncates the data stream of the application layer into groups, and the TCP

TCPIP Three-time handshakeTCP (transmission Control Protocol) transmission protocolTCP is the host-to-host layer of the Transmission Control Protocol, providing a reliable connection service, using three-time handshake confirmation to establish a

TCP is a TCP/IP Transport Layer Control protocol that provides a reliable connection service with three handshake confirmations to establish a connection:First you need to know several nouns:The TCP flag bit, with 6 types: SYN (synchronous), ACK

TCP is a TCP/IP Transport Layer Control protocol that provides a reliable connection service with three handshake confirmations to establish a connection:There are several nouns to understand first: The TCP flag bit, with 6 types: SYN (synchronous