waves dts

In program development, we often have to do is to access the database. Sometimes you invoke stored procedures and DTS, and here's an example to illustrate how to implement The first part invokes the stored procedure (with the parameter and get the return value) 1. Call SQL Server stored procedures If we have one of the following stored procedures, very simple implementation, but only two of the incoming value to do addition processing and then retu

Article title: four waves: Software Evolution and Linux application trends. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Software is evolving from single-host software such as Windows, Office, Kingsoft, to current Gmail, PPStream, Thunder, youtube, and facebook. Maybe how do you feel the software can be put toge

IP address is random, basically can be concluded that this is a SYN attack. Under Linux, you can check for SYN attacks as follows:#netstat-N-P TCP | grep syn_recvIn general, the newer TCP/IP protocol stack modifies this process to prevent SYN attacks and modify TCP protocol implementations. The main methods are SynAttackProtect protection mechanism, SYN-cookie technology, increasing the maximum half-connection and shortening the time-out period, etc., but cannot prevent SYN attack completely.TC

TCP four times Wave 650) this.width=650; "title=" Qq20160804193043.png "src=" http://s5.51cto.com/wyfs02/M02/85/70/ Wkiom1ejjvytbuhjaaiadeiuii4677.png-wh_500x0-wm_3-wmp_4-s_4040190579.png "alt=" Wkiom1ejjvytbuhjaaiadeiuii4677.png-wh_50 "/>TCP Four waves, the TIME_WAIT state is the state that the client is in when the server sends a fin interrupt request to the client.According to the TCP protocol defined by the 3-time handshake disconnection rule

server, the report text should be invalid, but the two-time handshake mechanism will allow the client and the server to establish a connection again, which will lead to unnecessary errors and waste of resources. If the three-time handshake is used, even if the message was sent to the expiration, the server received the failure message and replied to the confirmation message, but the client does not issue a confirmation again. Because the server cannot receive the acknowledgement, it knows t

not requested a connection. release of the TCP connection (four waves) After the data transfer is complete, both sides can release the connection. At first, both the client and the server are in the established state, and then the client shuts down actively and the server shuts down passively. The client process sends a connection release message and stops sending data. Release the data packet header, Fin=1,

Number)字段里。发送完毕后，客户端进入 `SYN_SEND` 状态。* Second handshake (syn=1, Ack=1, Seq=y, acknum=x+1):服务器发回确认包(ACK)应答。即 SYN 标志位和 ACK 标志位均为1。服务器端选择自己 ISN 序列号，放到 Seq 域里，同时将确认序号(Acknowledgement Number)设置为客户的 ISN 加1，即X+1。 发送完毕后，服务器端进入 `SYN_RCVD` 状态。* Third handshake (ack=1,acknum=y+1)客户端再次发送确认包(ACK)，SYN 标志位为0，ACK 标志位为1，并且把服务器发来 ACK 的序号字段+1，放在确定字段中发送给对方，并且在数据段放写ISN的+1发送完毕后，客户端进入 `ESTABLISHED` 状态，当服务器端接收到这个包时，也进入 `ESTABLISHED` 状态，TCP 握手结束。The removal of TCP connections requires the sending of four packets, so ca

TCP ((transmission Control Protocol) transmission protocol, is a connection-oriented protocol. The connection will be established (three handshake) before the data transfer is made using this protocol, and when the data transfer is complete, both sides of the connection will notify the other party to release the connection (four waves). Recognize the TCP flag bitThe TCP flag bit is marked with 6 types:SYN (synchronous set up online)ACK (Ackno

Establishment and release of TCP connections (three handshake with four waves)TCP is a connection-oriented transport layer protocol that provides a reliable, full-duplex, byte-stream-oriented point-to-point service. The HTTP protocol is implemented based on the TCP protocol. (although as an application-level protocol, the HTTP protocol does not explicitly require that the TCP protocol be used as the transport layer protocol, but because of the HTTP pr

Three-time handshake for TCP1 The client sends syn=1,seq=x here the serial number bits of the client data xWhen the server is turned on passively, it becomes listen listening state.2 server-side issue syn=1 ack=1 seq=y ack=x+1Syn=1 at the same time Ack=1 agree to establish a connection here server-side data serial number bit is Y(A lot of data has been sent before, here automatic arranging to Y),Ack=x+1 represents the data sent by the client X I got it, next time I want you to send x+1When the c

number should start from x+1, wave when the fin also the same)---------------------------------TCP four times Wave---------------------------------The removal of TCP connections requires sending four packets, so called four waves (Four-way handshake). The client or server can initiate a wave gesture, and in socket programming, either side performs a close () operation to generate a waving actionWave for the first time:The client process sends a conne

As we all know, TCP requires three handshakes to establish a connection, but the disconnection requires four waves. Why do we need four waves and so many wait states, such as Wait1 and wait2, this is because when establishing a connection, both the sending and receiving sides are "pure". When the client sends SYN, the server does not have any data to send, but only needs to send a synack, therefore, the han

Tags: Internet applications, IP protocol, computer internet Wireshark packet capture illustration TCP three-way handshake/four waves details 1. The link layer, also known as the data link layer or network interface layer, usually includes the device driver in the operating system and the network interface card corresponding to the computer. They work together with the physical interface details of the cable (or any other transmission medium. 2. The

by step 2 and step 3 are from the end of the passive shutdown and may be merged into a sub-section. [2] (2) Between step 2 and step 3, from the execution of the passive closed end to the execution of the active closed one end of the flow of data is possible, this is called "semi-closed" (half-close). (3) When a UNIX process terminates either voluntarily (calling exit or returning from the main function) or involuntarily (receiving a signal terminating the process), all open descriptors are clos

"Three handshakes and four waves of the HTTP protocol":Three-time handshake: 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 confirm the customer's SYN (ACK=J+1), and also send itself a SYN packet (syn=k), that is, the Syn+ack packet, when the server enters the SYN_

Times in the development, technology is ever-changing!background-based template language, always put the "front" in a "secondary" position, it has been in order to do the "main" and struggle ...With the development of the web, JS is stable and popular, and finally the template language based on JS appears.For example, simple refining of the underscore Template,mustache, support for custom label handlebars and so on.JS-based template can be more granular definition, run based on JS, the relevant

Eclipse appears with red strip and red exclamation marks, eclipse Waves I have been using eclipse to write Python, and I always see some strings with red wavy lines, It looks uncomfortable. It was finally eliminated after a long time. It turned out to be a spelling check. Windows> Preferences> General> Editors> Text Editors> Spelling can cancel Enable spell checking. There is also a yellow exclamation point prompt Window> Preferences> General>

, normative system and procedures, enterprises like an efficient operation of the machine, departmental functions, job responsibilities, code of conduct, operational procedures to achieve programmatic, information transmission, the work to achieve the program, talent, capital, materials, time and other resources to achieve scientific use, These enterprises have entered the stage of scientific management, while some multinational companies and a few excellent enterprises in the establishment of s

Marker Indicator 76 page from the description of multiple occurrences of shift-to-right, refers to the 1th wave rebound in the process of forming a 2th wave (not confirmed 1th wave), can not complete the 2th wave initialization conditions, the formation of 8 lower than the previous closing price of K line, and then directly to the bottom of the rebound, at this time, Cancels the non-formed 2th wave, and does not think that the 1th wave is formed, and the wave shifts right to the current highest

".First wave: The active shutdown sends a FIN, which is used to close the active side to the passive closed side of the data transfer, that is, the active shutdown to tell the passive shut-off party: I will no longer send you the data (of course, the data sent before the FIN packet, if not received the corresponding ACK acknowledgement message, The active shutdown will still re-send the data), but the active shut-off party can also accept the data at this time.Second wave: The passive closing pa