handshake b2b

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

OverviewSummarize the 3 handshake process in TCP and the introduction of SYN flood caused by its native flaw1, TCP connection establishment--three times handshakeSeveral concepts: SEQ: Ordinal, 4 bytes, range [0,4284967296], because TCP is byte stream oriented, inTransfer byte stream in a 1 TCP connection each byte in China is numbered sequentially, and the sequence number is used in the loop. ACK: the confirmation field is valid only whe

OverviewSummarize the 3 handshake process in TCP and the introduction of SYN flood caused by its native flaw"1" TCP three-time handshake"2" SYN Flood1, TCP connection establishment--three times handshakeSeveral 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 China each of the bytes are numbered sequen

OpenVPN Optimization-Establishment of TLS handshake Control CHannel An optimization of the OpenVPN data tunnel is in progress. After referring to the concept and idea of the "giant frame", I carefully considered the design and implementation of the TCP/IP protocol stack, so I come up with a possible error, but at least it is very practical in my scenario: although the upper-layer protocol sends data, it doesn't matter the data size. If it really needs

TCP handshake/waving Process AnalysisIn TCP/IP, TCP provides reliable connection services and uses three handshakes to establish a connection.The server must be prepared to accept external connections. This is done by calling the socket, bind, and listen functions, called passive open ).The first handshake: the customer actively opens (active open) by calling connect ). This causes the customer TCP to send

Three-time handshake: establishing a TCP connection Connection Establishment Process:The TCP server process of B first creates the Transport control block TCB (which stores some important information in each connection, such as the TCP connection table, the pointer to the sending and receiving caches, the pointer to the retransmission queue, the current send and receive sequence numbers, and so on), ready to accept connection requests from the c

about TCP/IP three handshake protocol, This article has a detailed introduction , very easy to understand, when forgotten, can come over to look at the two eyes, to ensure that soon understand.First, the TCP/IP protocol is divided into three phases: establishing a connection (handshake phase), data transfer phase, and connection termination phase.See the previous study of the "Computer network" textbook,

Briefly describe some of the key words in WPA/WPA2 's 4-time handshake:WPA/WPA2 uses a 4-time handshake to generate the required key. The four-time handshake generates PTK (pairwise Transient key) from the PMK (pairwise Master key) through a series of interactions. The PMK is from MSK (Master Session Key), which is the first 256 bits of the MSK, 32 bytes.PTK contains 3 parts, KCK (Key confirmation key), KEK

Turn from:Http://blog.chinaunix.net/uid-9112803-id-3212041.htmlSummary:In this paper, we briefly introduce the theory of TCP-oriented connection, describe the meanings of each field of TCP messages, and select TCP connections from Wireshark capture packet to establish the relevant message segment.I. OverviewTCP is a reliable connection-oriented transport protocol, two processes to send data before the need to establish a connection, where the connection is only some of the cache and state variab

Because of the project needs, the HTTPS forced handshake has been studied, the sharing processing method is as follows:I. Problems and needsproblem: The Access Party may have HTTPS certificate authentication for the same domain name, and under the caching mechanism, the HTTPS handshake is reused by default in the SDK, or Nsurlprotocol is blocked for authentication.Requirements: based on the SDK side does no

, 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 protocolTCP is the host-to-host layer of the Transmission Control Protocol, providing a reliable connection service, using three-time

From: http://blog.csdn.net/metasearch/article/details/2147213 TCP handshake protocol In TCP/IP, TCP provides reliable connection services and uses three handshakes to establish a connection. First handshake: when a connection is established, the client sends the SYN Packet (SYN = J) to the server and enters the syn_send status. Wait for the server to confirm; The second

Overview A summary of the 3 handshake processes in TCP and the introduction of SYN flood caused by their native defects "1" TCP three times handshake "2" SYN Flood 1, TCP connection establishment--three times handshake Several concepts: "1" SEQ: Serial number, accounting for 4 bytes, range [0,4284967296], because TCP is byte-oriented, the byte stream is transferr

I. connection-oriented protocols UDP is a connectionless protocol, while TCP is a connection-oriented protocol. The connection-oriented protocol directly establishes a logical connection between two peer intranets. It ensures that it successfully reaches the receiver by tracking data transmission and confirming and tracking sequence numbers. In short, TCP data transmission is safer than UDP. Ii. TCP handshake TCP connection-oriented transmission s

I wrote a blog post: Use Fiddler to debug HTTP and HTTPS. 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 the book, I never really saw these packets, I always feel the same

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 the book, I never really saw these packets, I always feel the same as floating on the cloud, and I am not steadfast in learni

1.OSI Reference Model of computer network architecture 2.TCP/IP Architecture Second, TCP three-time handshakeTCP (Transmission Control Protocol): Transmission Control Protocol. TCP is the host-to-host layer of the Transmission Control Protocol, providing a reliable connection service, using three-time handshake to establish a connection. There are 6 types of flag bits for TCP: 1.SYN (make connection) indicates the synchronization