tcp proactive

Turn from: http://liujianguangaaa.iteye.com/blog/975445 11 Network connection status on Linux server State Machine for TCP Normally: a normal TCP connection, there will be three stages: 1, TCP three handshake; 2, data transmission; 3, TCP four times wave Note: The following instructions are best combined with the

Editor's note: You have anti-virus software, network firewalls, and various preventive measures. However, in the face of various unstable factors, can you ensure that you will never win? Do not be confused when exceptions occur. self-check helps you identify security risks and develop defensive strategies. To handle security problems with ease, you must start self-check. Starting from this issue, we will bring you a self-check trilogy to guide you to self-check. Today, we will introduce the self

One; prefaceThe people who have learned the TCP/IP protocol have a feeling, this thing is too abstract, there is no data instance, after reading soon forget. This article will introduce an intuitive learning method, using the Protocol analysis tool to learn TCP/IP, in the process of learning to visually see the specific transmission process of data.For beginners to understand more easily, this article will

Read Catalogue Factors of delay Speed delay Bandwidth delay Last kilometer delay-tracerouter Goal Settings for Rwnd Slow boot process Impact of Slow start Slow start a calculation of the HTTP impact Appropriate values for congested windows Server Configuration Tuning Application Behavior Tuning Performance checklist See the effects of TCP on HTTP for three handshake, flow control (receiv

By understanding the status of TCP, We Can troubleshoot and locate network or system faults. I. TCP status Listening: listens for connection requests from remote TCP ports. First, the server needs to open a socket for listening, and the status is listen. A service is provided in the listening status. a tcp status chang

Reprinted please indicate the source: http://blog.csdn.net/ns_code/article/details/29382883 TCP Header Format First look at the format of the TCP packet segment, as shown below; The first 20 bytes of the TCP segment header are fixed, and the next 4 bytes are added as needed. Therefore, the minimum length of TCP packet

Encethernet-based freemodbus-TCP Porting and testing on stm32 Daniellee_ustb QQ: 382899443 Modbus-RTU was transplanted yesterday. The free Modbus-TCP Transplantation on encethernet started tonight. The development board used is the firebull Development Board and the network solution of stm32f103 + enc28j60. The mainstream TCP/IP protocol stacks include UIP and LW

3.4. Establish a connection A three-message handshake is used to establish a connection application. If both parties send SYN at the same time, the two parties will find that the SYN is not confirmed, so they will know this situation. Generally, A "reset" segment should be sent to solve this problem. The three-message handshake reduces the possibility of connection failure. The following is an example. The angle brackets are the content and tags in the data segment. I will not talk about any

TCP is a connection-oriented protocol that must establish a connection between the two parties, regardless of which direction the other party sends the data. This section discusses in detail how a TCP connection is established and how it terminates after the communication has ended. Establish a TCP connection TCP us

Original address: http://www.cnblogs.com/imystr/p/4026639.html OSI Seven layer modelLayer-Functional TCP/IP protocol family in OSIApplication-layer file transfer, email, file service, virtual terminal tftp,http,snmp,ftp,smtp,dns,telnetPresentation layer data format, code conversion, data encryption No protocolSession layer release or establish contact with other contacts no agreementThe Transport layer provides end-to-end interface

Ext.: http://blog.csdn.net/yusiguyuan/article/details/17710141 b/S communication brief The realization of the whole computer network embodies the realization of the protocol , the TCP/IP protocol is the core protocol of the Internet, and the HTTP protocol is a higher level application layer protocol than TCP. HTTP (hypertext Transfer Protocol, Hypertext Transfer Protocol) is one of the most widely used ne

(Xee: This IP is definitely not an IP address in connection with TCP!) , also an agreement! What kind of protocol, see the following programming TCP/IP architecture ) Now attach several pictures to see: The network is divided from bottom to top: The physical layer, the data link layer, the network layer, the Transport layer, the session layer, the presentation layer, and the application layer. With a preli

Why is there a TCP/IP protocolAll over the world, a wide variety of computers run their own different operating systems for everyone, and these computers are used in many ways when expressing the same message. It is as if God in the Bible has disturbed the accents of people everywhere and made them unable to cooperate. Computer users realize that the computer is only a man-in-the-war and does not play a big role. Only by bringing them together can the

Be careful when setting tcp parameters. do not change the online environment easily. I will paste the content of sysctl. conf in our online environment. for details, see net. ipv4.tcp _ protocol at the bottom of the article... Be careful when setting tcp parameters. do not change the online environment easily. I will paste sysctl in our online environment. for mo

This reference article is mainly used for the diffusion of knowledge points in subsequent articles, in this special backup and diffusion learning Exchange.There are TCP protocols and UDP protocols in the transport layer.1.UDP IntroductionUDP is a transport layer protocol, and the TCP protocol is in a hierarchy, but unlike the TCP protocol, the UDP protocol does n

TCP/IP protocol stack This section briefly introduces the internal structure of TCP/IP and lays the foundation for discussing Internet-related security issues. TCP/IP protocol groups are popular in part because they can be used on a variety of channels and underlying protocols (such as T1 and X.25, Ethernet, and RS-232 serial interfaces. Specifically,

At present, TCP/IP has become the dominant technology of network. Through the analysis of TCP bottom implementation, a long puzzling problem in TCP/IP programming----Real-time detection of network connection interruption is analyzed, and the corresponding solution is put forward. 　　 0 Introduction As the dominant technology in modern networks,

TCP Services TCP and UDP Use the same network layer (IP), TCP provides a connection-oriented, reliable byte throttling service.Connection-oriented means that only two parties communicate with each other. Broadcast and multicast cannot be used for TCP.The reliability of TCP is mainly shown in the following aspects:(1)