TCP three-time handshake and four-time waveFirst, let's describe what the transport layer is:1, three handshake1) Three-time handshake detailsFirst, the client (client) side sends the connection request message, the server (server) segment accepts the connection and replies to the ACK message, and allocates resources for the connection. An ACK message is also sent to the server segment after the client rece
TCP is the transmission control protocol used by the host to control the host layer. It provides reliable connection services and uses three handshakes to establish a connection:
The location code is the TCP flag. There are 6 types of tags: SYN (synchronous established online) ack (acknowledgement confirmation) Psh (push transfer) Fin (finish ended) RST (reset) URG (Urgent urgent)
Sequence Number acknowledge number (confirmation number)
The first handshake
Three-way handshake and four waves for TCP/IP Protocol Resolution
I. TCP Message format
For more information about the TCP/IP protocol, see "TCP/IP protocol details. The following figure shows the TCP packet format:
Figure 1 TCP Message format
There are several fields that need to be described below:
(1) sequence number: Seq number, which occupies 32 bits. It is used to identify the byte stream sent from the TCP source end to the target end. It is m
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 connection, transmission, and disconnection of TCP are controlled by the control bit , which consists of the followin
TCP Three-time handshakeThe so-called three-time handshake is a TCP connection that requires the client to send 3 packets to the server.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 emergency) Sequence number (sequential) Acknowledge number (confirmation)First handshake
Analysis on three-way handshake process of TCP transmission control protocolTCP (Transmission Control Protocol) is the Transmission Control Protocol of the host to the host layer. It provides reliable connection services and uses three-way handshakes to establish a connection: the bit code is the TCP flag bit, there are 6 tags: SYN (synchronous established online) ACK (acknowledgement confirmation) PSH (push transfer) FIN (finish ended) RST (reset) UR
I. SSL handshake has three purposes:1. The client and server need to agree on a set of algorithms used to protect data;2. They need to establish a set of encryption keys used by those algorithms;3. Handshakes can also be used to authenticate the client.
Ii. SSL handshake process:1. The client sends the list of algorithms it supports and a random number used to generate the key to the server;2. the server se
1) Encryption suite interaction;2) password Exchange;3) identity authentication;Full handshakeInitially, client and server "agree upon" null encryption with no MAC and null compression. This means the record they would first send would be sent as cleartext and unprotected.First message of a handshake is a ClientHello . It is the message by which the client states its intention to do some SSL. Note that the "client" is a symbolic role; It means "the pa
Understanding TCP/IP three-time handshake and four wave-waving correct postureBackground
and girlfriend long-distance love for more than a year, in order to maintain feelings I propose every night video chat.
From the good to the beginning, to now, more than a year to hold down.
Problem
Sometimes in the process of chatting, my network or her network may not be good, the video will be stuck, can not hear the other side of the voice, after a while wil
In the TCP/IP protocol, the TCP protocol provides a reliable connection service with a three-time handshake to establish a connection.First handshake: When a connection is established, the client sends a SYN packet (SYN=J) to the server and enters the Syn_send state, waiting for the server to confirm;Second handshake: The server receives the SYN packet, it must c
.
PSH is 1, typically only in packets where the data content is not 0, meaning that PSH is 1 means that there is a real TCP packet content being passed.
TCP connection establishment and connection shutdown are done through a request-response pattern.
Concept Supplement-tcp three-time handshake:
TCP (transmission Control Protocol) transmission protocol
TCP is the host-to-host layer of the Transmission Control Protocol, providing a reliable connection s
TCP (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 emergency)Sequence number (seq
The so-called three-time handshake (three-way handshake) establishes a TCP connection, which means that when a TCP connection is established, a total of 3 packets are sent by the client and the server to confirm the establishment of the connection. The so-called four-time wave (Four-way Wavehand) terminates the TCP connection, that is, when disconnecting a TCP connection, the client and the server are requi
TCP Handshake Protocol
In the TCP/IP protocol, the TCP protocol provides a reliable connection service, and a three-time handshake is used to establish a connection.
First handshake: When the connection is established, the client sends the SYN packet (SYN=J) to the server and enters the Syn_send state, waiting for the server to confirm;
Second
considered an error after receiving the RST. If the TCP protocol wants to complete the necessary operation and terminate the data stream transmission of the two parties, it must transmit the four sections of the four handshake completely correctly without any loss. This is the first reason why the socket is still in the TIME_WAIT state after it is closed, because he has to wait for the ACK to be sent back.Suppose that both sides of the current connec
sender wants to re-transmit the packet upon timeout.
Re-sorting: Because IP datagram may be out of order, TCP will re-sort the data and hand it to the application layer in the correct order.
Discard duplicate: Because IP datagram may be repeated, TCP will discard duplicate data.
Traffic control: both ends of the TCP connection have a fixed buffer space. The TCP receiver only allows the Peer to send data that the local buffer can accommodate. TCP provides traffic control. When both parties in
[Scenario description]
The client is started, and the server is started.
The client initiates a connection
The client sends a packet containing the four bytes of "Hutu"
Client disconnection, server disconnection
[Process diagram]No picture, no truth!
[Socket status change diagram]No picture, no truth!
Establish a connection protocol (three-way handshake)
(1) the client sends a TCP packet with SYN flag to the server. This is packet 1 during t
Wireshark basic introduction and learning TCP three-way handshake, wiresharktcp
This article introduces wireshark, a useful packet capture tool, to obtain network data packets, including http, TCP, UDP, and other network protocol packets.
I remember that I learned the TCP three-way handshake protocol when I was in college. At that time, I only knew that although I had read a lot of TCP and UDP materials in
It takes three handshake to establish TCP and four handshake to disconnect. The entire process is shown in the following illustration:
The process of establishing a connection:A TCP connection is initialized with a three-time handshake. The purpose of the three handshake is to synchronize the serial number and confir
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