cpp handshake

TCP three-way handshake1. When a connection is established, the client sends a SYN packet to the server and generates an sequential number seq number = K, waiting for the server to confirm.2. After the server receives a request, confirm the online information, send the confirmation code ACK = k + 1, Syn packet to the client, and generate an sequence number seq number = Q.3. Check whether the Ack is correct after the client receives the confirmation information. If yes, send the confirmation code

The reasons are explained in the computer network (Shehiren translation): 1. Two handshake, then if the client to the server-initiated package A1 if the fault in the transmission link, resulting in the transfer to the server time is rather lag, in this time period because the client did not receive the server for the package A1 confirmation, then will retransmit a packet A2, Assume that the server received the A2 package normally, and then return to c

client side of the process is experiencing the following status: The server side is experiencing the following process: "Note" in the time_wait state, if the last ACK sent by the TCP client is lost, it will be re-sent. The time required in the TIME_WAIT state is dependent on the implementation method. Typical values are 30 seconds, 1 minutes, and 2 minutes. The connection is formally closed after waiting, and all resources (including the port number) are released. "Question 1" Why is the

When learning the network basics, the transport layer protocols include TCP and UDP; In Linux network programming, we use the socket API to implement network communication. So: How does the status of Socket API correspond to that of TCP? We can see through: How to complete three handshakes and four waves in Socket System calls: Sock_dgram, that is, the connect operation knowledge in UDP registers the IP address and port information of the other machine in the kernel, and does not establish a l

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 connection:The bit code is the TCP flag bit, there are 6 kinds of marking: SYN (synchronous set up) ACK (acknowledgement acknowledgment) PSH (push transfer) FIN (finish end) RST (reset reset) URG (Urgent emer

Due to the development of VC + +, we need to master some of the original rational things. In particular, the concept of source and header files requires in-depth understanding of it:about the difference between header and source files First, we can put everything in a. cpp file.The compiler then compiles this. cpp into. Obj,obj What is it?is the compile unit. A program can consist of a compilation unit or m

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 deep understanding of each state of the graph and the process of conversion, and not just stay in the smattering. Below is a detailed analysis of the 11 states of this graph in order to enhance the memory! But before that, let's review the three

responds with a packet back, it indicates that the host has this port, but since this scan is only the first handshake of the TCP three handshake, the success of this scan indicates that the machine being scanned is not very secure, A secure host will force a tightly connected three-time handshake to TCP; FIN: Indicates that the sender has reached the end of

(1) VC6 Build DLL Learning below1. Generating a DLL using VC6.0New Project "Win32 dynamic-link Library", enter the project name, select "A Simple DLL Project" and click "Finish". The following is the auto-generated code for the CPP file:#include "stdafx.h"BOOL apientry DllMain (HANDLE hmodule,DWORD Ul_reason_for_call,LPVOID lpreserved){return TRUE;} To edit a CPP file:Join in the next line of # include "Std

Php-cpp is a C + + library for developing PHP extensions. This section explains the implementation of PHP output and functions.Output and ErrorsIn the HelloWorld example above, we used the Php::out output and used a std::endl newline refresh buffer. Php::outA variable is actually std::ostream an instance of the class that supports all the output buffers set in PHP. It is basically the same as a function in a PHP script echo() .Several common ways to e

Php-cpp is a C + + library for developing PHP extensions. This section explains the implementation of PHP function parameter correlation.specifying function parameter typesSometimes we need to specify that the parameters of a function are arrays or specified, so can you specify the parameter type of the function in Php-cpp? The answer is yes.Pass by valueExample:/** * User: 公众号: 飞鸿影的博客(fhyblog) * Date: 2018

Analysis of three-time handshake process for TCP protocolTCP (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 connection:The bit code is the TCP flag bit, there are 6 kinds of marking: SYN (synchronous set up) ACK (acknowledgement acknowledgm

TCP (transmission Control Protocol) transmission protocol Three-time handshake TCP is the host-to-host layer of the Transmission Control Protocol, providing a reliable connection service, using three-time handshake confirmation to establish a socket connection: "Bit code" is the TCP flag bit, there are 6 kinds of marking: SYN (synchronous set up online) ACK (acknowledgement)---> Acknowledgement: acknowledg

Shaking hands is a way of communicating ideas, exchanging feelings, and promoting friendships. Of course, the premise is that you have to grasp the correct handshake etiquette, the following is a small series of study abroad for everyone carefully collected and collated social etiquette handshake etiquette, hope you like!　　"The formation of the Handshake etiquett

1: Enter the vim file name. cpp2: Edit, edit operation reference----> First knowledge vim main three steps: 1) Enter the letter I, into the insert writing mode, after writing, press ESC to exit the writing mode, press: Wq, save and exit, sometimes need to WQ after add! No.3: Enter the g++ file name. cpp-o file name, error just look at where the error is, and then enter the Vim file name. cpp, or press ^ Thi

Ethereum, a Chinese translator, is an open-source project in the public blockchain. Because Ethereum is based on a peer-network, there is no central node, so users can only install Ethereum clients to connect to the Ethereum public network or run Ethereum under their own testnet.Ethereum clients are available in many languages.The C + + version is selected in this article. The configuration process is as follows:Reference: Http://ethdocs.org/en/latest/ethereum-clients/

Take Fastdb as an example, there are many demo Fastdb examples to use, c++demo how to use ..., with Visual Studio 2013To the familiar person is too simple, unfamiliar person is childs ... Don't talk nonsense, on the steps ...Material Preparation:Fastdb source:http://www.garret.ru/fastdb.htmlTools: Visual Studio 2013Open the Fastdb folder you will see there are Fastdb.sln, open the project, compile build DLL standby, because later also debug, so select Debug DLLNext open the Fastdb/examples folde

First of all, we can put everything in a . cpp file. The compiler then compiles the. cpp into a . Obj,obj is the compilation unit . A program can consist of a compilation unit or multiple compilation units . If you don't want your source code to be difficult to read , use multiple compilation units . ( A function cannot be placed in two compilation units , but more than two can be placed in a single un

1. Handshake and key negotiation processClient Authentication server based on RSA handshake and key exchange for an example TLS/SSL handshake processLook at a hand-drawn timing diagram. (1). Client_hello Client initiates a request to transmit the request information in clear text, including the version information, the Cipher Suite candidate list, the compre

=1 said: The sender of this segment of the data has been sent, and requested to release the transport connection.PSH indicates that the receiving party should give the message to the application layer,RST indicates a connection reset,Urg represents an emergency pointer, not commonly used. two, "three times handshake" concept: the so-called "three-time handshake" is the process of establishing a TCP connect