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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

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

Prevent man-in-the-middle (mitm) Attacks Document options Level: elementaryKenth Ballard (kenneth.ballard@ptk.org), free programmerMay 23, 2005 Secure handshake in a Secure Socket Lay

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

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

Partial reprint, speak very wellReprint from here why need "three handshake" In the fourth edition of the "Computer network," The purpose of the "three handshake" is "to prevent the failure of the connection request packet suddenly transmitted to the server, resulting in an error". In another classic computer network, the purpose of the "three-time handshake" is

In the TCP/IP protocol, the TCP protocol provides a reliable connection service with a three-time handshake to establish a connection, as shown in 1.(1) First handshake: When a connection is established, client A sends a SYN packet (SYN=J) to Server B and enters the syn_send state, waiting for Server B to confirm.(2) Second handshake: Server B receives the SYN pa

Overview Summarize the 3 handshake process in TCP and the introduction of SYN flood caused by its native flaw "1" TCP three-time handshake "2" SYN Flood 1, TCP connection establishment--three times handshake Several concepts: "1" SEQ: serial number, 4 bytes, range [0,4284967296], because TCP is a byte-stream-oriented, in a 1 TCP connection to transmit the byte st

Overview Summarize the 3 handshake process in TCP and the introduction of SYN flood caused by its native flaw "1" TCP three-time handshake "2" SYN Flood 1, TCP connection established--three handshake Several concepts: "1" SEQ: serial number, 4 bytes, range [0,4284967296], because TCP is a byte-stream-oriented, in a 1 TCP connection to transmit the byte stream in