fix protocol 4 2

Request) and Echo Reply (Echo response): ping the Echo Request and Echo Reply commands actually used. Source Quench: the Source computer can be notified to reduce the speed of data transmission. Ø Destination Unreachable (the target cannot be reached) Ø Time Exceeded (timeout): When the datagram is discarded because the TTL is 0, ICMP will send the message. Ø Fragmentation Needed (need to be decomposed): When the non-decomposition bit of the datagram is set to 1, and the router needs to be deco

executed, the Web application will receive an error message notification. 2. After TCP establishes the connection successfully, BROWSER/UA transmits the WebSocket supported version number through the HTTP protocol, the Word version number of the Protocol, the original address, the host address and so on some column fields to the server side. For example: [HTML

1 SPDY protocol 1.1 Overview SPDY is the abbreviation of speedy, which is the pronunciation of speedy. The SPDY protocol has published four drafts: Version 1, version 2, version 3, and Version 3.1. Version 4 is currently in the trial phase, but has not yet been released. There are some code for version

connection is immediately closed.Jdwp:pidConnect the JDWP thread inside the Java virtual machine process specified by the process number in the target deviceTrack-jdwpThis service is used to periodically send a list of process numbers to the client that have the JDWP process enabled.The format of the returned data is the following:The return data format is as follows: HEX4: Represents a 4-byte 16 binary string that returns the length of the

server.(2) Returns a reference to the primary server from the server to the LDAP client.(3) The LDAP client submits an LDAP modification request to the primary server.(4) The master server modifies the data in the database and changes the log file written to the local computer.(5) The SLURPD process running on the primary server checks for new content in the log and sends changes to the slave server throug

not in the same subnet, they will not be able to know the MAC address of the other computer. They must be forwarded through the gateway. Computer 1 sends a packet to computer 4. It first checks whether the computer No. 4 is in the same sub-network and finds that it is not (this article introduces the judgment method), so it sends this packet to Gateway. Through the routing

The Hypertext Transfer Protocol (Http-hypertext Transfer Protocol) defines the transport rules for communication between the client and the server. Currently the latest version is 1.1,http is an application-layer protocol, consisting of requests and responses, and is a standard client server model.First, Features:1, support client/server mode. Support Basic authe

parse the data, Where the const section is used to define headers,headerlength is the length of the headers for subsequent server-side parsing. Here's the Constmlength, which represents the length of the incoming message for the client, because in Golang, the int goes to byte and takes up 4 of the length of space, so it is set to 4. Each time the client sends a message to the server, the length of the inco

technology, excited and excited mood to learn, you can get something. Well, the first thing I did when I started my project was to study the code of the XMPPFramework author. I analyzed and imitated the code by module, and I was still thinking about it when I went to bed, analysis, summary... Of course, I am not saying that every Dev will treat me like this. I just hope that you can maintain a positive attitude towards technology and your work. That's all. ResourceURL: https://github.com/robbie

2 discusses how to modify the attributes of a session by using an invite request. Chapter 4 describes how to terminate a session. Chapter 8th, 10, 11, 12, 13, 14, and 15 describes the UA core (Chapter 9th describes cancellation, applicable to UA core and proxy server core ). Chapter 2 discusses the proxy server entity, which is easier to Route packets between pr

GH0ST Communication Protocol Resolution (2) Starting from the active connection of the controlled side to the main control end. All things in the world, the beginning of the Universe universal Power is the force of God that push. Of course, the interaction between the host side and the controlled side is always initiated from the controlled side to the main terminal, so let's start with the initiation of th

in the packet is loaded into the BUF array.getData (): It obtains a byte array encoding of the message from the instance.Example 1: Write a program that demonstrates the use of UDP protocol datagrams for sending and receiving.Send SidePackage Net.csdn.web;import Java.io.ioexception;import Java.net.datagrampacket;import java.net.DatagramSocket; Import Java.net.inetaddress;public class Demosend {public static void main (string[] args) throws IOExceptio

words of the IP header are also used for inspection and calculation, but theyis initialized to 0 and does not affect the final Test and.Summarizes the actions we describe:1. The top figure is the agreement definition for the first part.2. The middle diagram is the UDPIPHDR structure used in the source code, which is used to calculate the UDP test and.3. The following figure is the IP/UDP header that appears on the line. The 7 fields with the arrows a

resources, Each request causes a meaningless TCP connection to be established and disconnected, increasing the overhead of the traffic.In order to solve the problem of TCP connection above, http/1.1 proposed a method of persistent connection. The feature of persistent connections is that the TCP connection state is maintained as long as the disconnect is not explicitly made at either end.PipelinePersistent connections are the most requests that can be routed in a pipelined manner. Before sendin

: Control code, followed by fixed data field length, data ID and serial number.04: Data field Length (fixed).A0 17: Data identification (fixed).01: Serial Number (fixed).99: Function code, indicating the shut-off valve.94: Cumulative and, from the protocol header 68 to the function code 55 combined with and . .16; Terminator. Reply data:Fe fe FE theTen the to - to the - + - toA0 - on 7C , as a one-to-one- tenThe description is as follows:Fe f

local area network. , the main content of the group is: "My IP address is 192.168.1.9,mac address is: XXX, whose IP address is 192.168.1.15??"(2) The ARP process running on all hosts on the local area network receives this ARP request grouping.(3) Computer A's IP address and ARP request group the IP address of the Chinese Medicine query is consistent, the ARP request group, and to the MCU relaxed arp-response packet, the approximate content is "My IP

HTTP messages are text-oriented, and each field in the message is a number of ASCII strings, and the length of each field is indeterminate. HTTP has two types of messages: Request messages and response messages.HTTP request messageAn HTTP request message consists of a request line, a request header (header), a blank line, and 4 parts of the request data, giving the general format of the request message.Or

XMPP protocol for instant messaging underlying writing (2) -- IOS XMPPFramework Demo + analysis, xmppxmppframework I hope This is a new day! Before reading the code, I think you should first sort out your mood and let me say a few words: First, I hope that you will read this blog in the morning and then start to operate it. If you only read the blog and do not compare the project yourself, it will not be ve

allowed. 40 bytes. Ip_hl is calculated in 4 bytes. 2. Input Processing: ipintr Function When the interface puts the group on the ipintrq queue, it calls a Soft Interrupt through schednetisr. When this soft interrupt occurs, if the IP address processing process has been The kernel calls ipintr. Before calling ipintr, the CPU priority is changed to splnet. Ipintr is a big function, which is mainly divided in

Java Network Programming (2) InetAddress class and udp protocol, inetaddressudpInetAddress class JDK provides the java.net package for developing network applications. The classes and interfaces under this package are almost all network programming services. InetAddress: the object used to describe the IP address The InetAddress class does not provide a constructor, Instead, a static method is provided to o