shadowsocks udp

Several days ago, I constructed a DNS packet and checked some information. It seems that many of my friends have always had problems with the UDP packet checksum. I tried some sample code and there were also problems. So it took some time to make a successful example. In Linux, GCC passes and verifies the success. # Include # Include # Include # Include # Include # Include # Include # Include # Include Unsigned short checksum (unsigned short * buffer

ScenarioIf you need to use UDP to transmit large data, such as 10 m images, this breaks through the design principles of UDP. UDP is designed based on "datax", that is, it assumes that each packet you send can be contained in a single package. In addition, the maximum length of UDP data packets is limited by the basic

OverviewUDP is the abbreviation of user Datagram Protocol, the Chinese name is the Subscriber datagram Protocol, it is a simple Transport layer protocol for datagram, and it is a kind of non-connected protocol for processing packets in the network. UDP does not provide reliable transmission, it simply sends the application to the IP layer's datagram, but does not guarantee that it will reach its destination. Because

Contents Introduction overhead UDP connections/spoofing Time outs Examples UDP tracker protocol Existing IPv6 Extensions References and footnotes Introduction To discover the other peers in a swarm a client announces it's existance to a tracker. The HTTP protocol is used and a typical request contains the following Parameters:info_hash, key, peer_id, port, download Ed, left, uploaded and compact. A response

private IP address after a NAT device, you must find a way to wear Through NAT, now commonly used transport layer protocols are mainly TCP and UDP, the following is the use of these two protocols to introduce the strategy to penetrate NAT. 2.1. Network topology Structure The following assumptions resemble the network topology diagram shown in Figure 1. Figure 1. Network topology structure diagram Server (129.208.12.38) is a public network of serve

real-time audio and video domain UDP is the kingly The Transport layer scheme for real-time audio and video interaction on the Internet has two types: TCP (e.g. RTMP) and UDP (e.g. RTP). The TCP protocol provides a relatively reliable guarantee for data transmission between two endpoints, which is achieved through a handshake mechanism. When the data is passed to the receiver, the receiver checks the correc

When your data scale reaches the Pb level, it will be time-consuming and labor-consuming to move such large data volumes, this is also one of the biggest challenges enterprises face when taking advantage of AWS's scale and elasticity to process analysis tasks. This article mainly introduces the accelerated File Transfer Protocol and describes how to use tsunami DUP to migrate large-scale data to the cloud, where UDP is used to process data transmissio

In the network communication protocol, the UDP protocol, which is equally important to TCP, is described briefly today. We often see this protocol in some network firewalls or anti-virus software. So what is the specific meaning of this protocol? UDP protocol User Data Protocol (UDP) is also a communication Protocol on the OSI transport layer. However,

In my two blog posts, a simple introduction and implementation of UDP (TCP)-based Windows (Unix process basically consistent) under the server and client programs, this article continues to explore some of the details of UDP programming.http://blog.csdn.net/nk_test/article/details/47733307http://blog.csdn.net/nk_test/article/details/47756381is a simple UDP client

The most complete difference between network protocol-TCP and UDP is introduced Preface: In order to facilitate the late turn look, the public number in slowly finishing the article, about the Java Network Programming content of the article, can be viewed in the menu bar-article Finishing-advanced module. Basic differences between TCP and UDP1. Connection-based and no-connection2.TCP requires more system resources, less

Reproduced from: http://blog.chinaunix.net/uid-20180960-id-2998594.html, thank the author. When it comes to UDP programming, the easiest question we can think about is how many bytes are sent at a time? Of course, this does not have the only answer, compared to different systems, different requirements, the answer is not the same, here just like the ICQ type of sending chat messages to analyze, for other cases, may also get a little help:First, we kn

For UDP protocol, it is different from TCP protocol in the transport layer, and its length is very suitable for the sharding policy. All of these content will be clearly explained in the article. So let's take a look at the specific content, hoping to provide you with a useful reference. 1. Brief Introduction to UDP UDP is a transport layer protocol, which is in

TCP-IP learning notes of UDP (User Datagram Protocol) I. Introduction UDP is a simple datagram-oriented transport layer protocol: Each output operation of the process generates a UDP datagram, and assembled into an IP datagram to be sent. This is different from the stream-oriented character protocol, such as TCP. The full data generated by the application may be

1.UDP Brief IntroductionUDP is a transport layer protocol, and the TCP protocol is in a hierarchy, but unlike the TCP protocol, the UDP protocol does not provide time-out retransmission, error retransmission and other functions, that is, it is unreliable protocol.UDP Datagram Structure:UDP header Format:Explain: Source port number: The item is any option, the default value is 0, which can be

This is a creation in Article, where the information may have evolved or changed. In the previous article Go Socket programming Practice: TCP Server and client implementation, we implemented an echo server, and also implemented a client to access the server.This article explains how to implement a UDP server and client.The protocol we're using this time is RFC 868,This protocol provides a site-independent, machine-readable date and time information. T

destination process) is done by TCP.7, the transport layer of the main protocolThe two main protocols of the TCP/IP transport layer are important standards for the Internet, TCP (Transmission Control Protocol) [RFC 768], User Datagram Protocol UDP (subscriber Datagram Protocol) [RFC 793].The data flow of the transport layer is to establish a logical connection between the network endpoints. If you use UDP,

bytes.Calculation principle of 1.3 UDP checksumThe UDP checksum is basically consistent with the TCP checksum.UDP checksum needs to divide the IP pseudo header, UDP header, UDP data into 16-bit words, and then accumulate (if the total length is an odd number of bytes, then add a bit to 0 bytes at the end), and finally

Summary: Test on the same host, same IP address, different ports, use UDP to receive dataUsing socket programming to send data over the UDP protocolRequirement: Send a single piece of data to a port on an IP using the UDP protocol Udpsend.java Packagecom. Train;Importjava.io.IOException;ImportJava.net.DatagramPacket;ImportJava.net.DatagramSocket;Importjava.net.I

In the use of UDP protocol, we usually use other language tools to complete the work. So today we will mainly introduce the use of UDP protocol in Java. First, let's take a look at the basic concepts of UDP. The full name of UDP protocol is user datagram, which is used to process data packets in the same way as TCP pro

Adding Internet applications to communication applications suddenly expands the communication space. The vast transmission space of the Internet has made communication a huge step forward. Now let's take a look at the basic principles and usage of TCP and UDP protocols in GPRS. GPRS is used in personal business networks, mainly for webpage access, sending and receiving mails, and various applications have fixed protocols. However, in industrial data t