reset tcp ip stack

directly, TCP throughput is severely reduced."Slow start, congestion avoidance" play--congestion window (congestion windows, as CWnd), slow start threshold (Ssthresh).　　When a TCP connection is established, the Ssthresh is initialized to 65535 bytes, and the congestion window is initialized to 1 segment (MSS), and a packet size is added for each ack,cwnd received. The sender takes min (Congestion window, s

There are many ways to optimize TCP/IP and kernel parameters under Linux, the configuration of parameters can greatly improve the performance of the system, and can also be optimized according to specific scenarios, such as time_wait, DDoS attacks and so on.The following configuration is written in sysctl.conf and can be used with sysctl-p.The relevant parameters are for reference only, the specific values

In the network programming, most of the time is to use the kernel filled with the message header, and then we fill in the data section to send. But if you're not sending a TCP/IP protocol, or some other reason, you need to fill the header of your message. In the filling of the message, the first is to understand the structure of the message header. The following is the structure of the

offset indicates the starting date, from the TCP first ministerial degree, in units of 4 bytes.Reserved reserved area.Urg emergency bits, data to be delivered as soon as possible.ACK Acknowledgement bit, 1 indicates the data is valid.PSH push Bits, commit now.PST reset bit, data transfer error, need to reestablish connection.SYN synchronous bits, which synchronize serial numbers when the connection is esta

Previous articles are here: Implement TCP/IP programming under DOS real model (I) In short, I was very busy recently. I thought it was really time-consuming to make a summary of the system. I wrote half of the previous article. I wanted to simply write the process from environment setup to coding, but let's take a closer look at the previous article, which involves a lot of nonsense and has no direct cuttin

used to identify different groups.(5) IPNote: 1. version Description: IPv4 and IPv62. service type: for example, minimum consumption, maximum throughput, maximum reliability, and minimum cost. the total length is up to 65535, but MTU and host requirements are limited. The total length includes the header and data 4. ID number identifies each packet sent by the host. there are three flag spaces, including whether to split (the first is not used, the second is not part identification, and the thi

I recently read the TCPIP explanation, a classic book on TCPIP analysis. The examples used in this book are Unix Commands and some tools written by the author using C. I am going to use Java to write some functions introduced in the book to deepen my understanding of the book. As we all know, the network protocol is layered. Let's first introduce the layer of the TCP/IP protocol

provider Internet Services Provider,isp . Each ISP is a network of multiple packet switches and multi-segment communication links. ISPs have different levels.End systems, packet switches, and other Internet components are run to control the information received in the Internet and send a series of protocol protocol. a protocol defines the format and sequence of messages exchanged between two or more communication entities, as well as the actions taken in connection with transmission or receptio

Tags: mysql tomcat socketYesterday evening 11:30, a female classmate called to say that the computer problem, said Tomcat and MySQL can't open, all kinds of urgency! Because the day after tomorrow will reply, these software can not open, the system will not run up! Most of the night let me do, had to say tomorrow early to help see!Early up, took the classmate's computer! Back to the dorm to see, MySQL really did not open the report of such a mistake "MySQL error: Can ' t create

LayerPresentation LayerApplication LayerThe OSI is too heavyweight, and many functions are implemented in two layers, respectively.But the TCP/IP model is what we use.Physical Layer:Data Link Layer:Internet layer:Transport Layer:Application layer:Class A: 255.0.0.0 8-bit10 00 0000-0) 111 11111-126 NetworkHow many hosts can be accommodated 2^24-2Host bit all 0: network addressHost bit full 1: Broadcast addr

TCP/IP Deep thinkingThis is my reading effective TCP/IP programming reading notes and thinking, as well as doing some experiments. It is strongly recommended that the backend engineer have the time to read the book, some of the details are indeed we do not pay attention to, read the best to do some experiments to deepe

purposes in different applications. 4) Application Layer: responsible for handling specific application details. Almost all different t c p/I P implementations provide the following common applications: www.2cto.com • Telnet, FTP and e-mail • FTP file transfer protocol. • SMTP Simple Mail Transfer Protocol. • SNMP Simple Network Management Protocol. •... 2. TCP/IP layer in the t c p/I P protocol family, th

Recently, we are looking at the TCP/IP BSD implementation. The first is its storage management, mainly through the structure of mbuf to manage the cache. After reading a part of the data, I think the design is very good. I split the big data into small pieces of storage, which makes it easy to write and recycle the pool. When I was writing a Streaming Media Server, I had been worried about the large memory

only the beginning of the TCP/UDP header to the end of the data, but also an IP pseudo header section, the so-called pseudo header, only 12 bytes of data, including the source address (4 bytes), Destination Address (4 bytes), Protocol (2 bytes, the first byte supplements 0), and TCP/UDP packet length (2 bytes ). TCP c

Due to the rapid popularity of the Internet, more and more applications are capable of communicating with other programs online. Since Win95, Microsoft has integrated network functions into its operating system, making the network communication capability of applications more popular. Therefore, Microsoft's TCP/IP Protocol becomes the preferred protocol for network applications. Generally, applications usin

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

New Understanding of the TCP/IP protocol (3) the two ends connected by the tcp protocol have some differences in the details of the Protocol during communication. The seq in the connection initiator syn in the connection establishment phase differs from the seq in the syn of the connection receiver. 1. When the connection is established, both parties need to repo

Summary of IP,UDP,TCP,SCTP finishing 1. protocol stack: Application Layer DNS, HTTP, FTP, TELNET, SSH, SIP, H.248/mgaco, diameter, MGCP, M3ua,m2ua,m2pa,sua ... Transport Layer Udp Tcp Sctp Network layer IP (ARP/RARP)

Communication between the two network programs requires a link channel between them, which consists of a five-tupleFive tuples:(protocol, local IP address, local port number, remote IP address, remote port number)Socket programming principle Socket Socket InterfaceCommunication between network programs relies on the socket socket interface for communication.For example: Host A above the QQ program needs to

When a host sends an Ethernet data frame to another host located on the same LAN, the destination interface is determined based on the 48-bit ethernet address. Device DriverProgramNever check the destination IP address in the IP datagram. Address Resolution (ARP) provides ing for these two different address formats: 32-bit IP addresses and any types of