ssi 4 protocol

discard the packet, and at the same time produce a host unreachable ICMP datagram to the host. The host receives this datagram and sends a ttl=2 UDP datagram to the destination host, then stimulates the second router to send ICMP datagrams to the host. This is repeated until the destination host is reached. In this way, traceroute gets all the router IPs. This avoids the problem that the IP header can only record limited routed IP.Someone asked, how do I know if UDP arrives at the destination h

useful information. The general information is as follows: Reply from 10.4.24.1: bytes = 32 time Reply from 10.4.24.1: bytes = 32 time Reply from 10.4.24.1: bytes = 32 time Reply from 10.4.24.1: bytes = 32 time Ping statistics for 10.4.24.1:Packets: Sent = 4, stored ED = 4, lost = 0 (0% loss ),Approximate round trip times in Milli-seconds:Minimum = 0 ms, maximum = 0 ms, average = 0 ms The word Ping is der

encountered---2, Information class Messages (Information message), also known as message messages , Highest bit to be 1, also ICMPv6 type=[128-255].NOTES: In the case of messages of the information class, the value of type is between 128-255 .Information-type messages (RFC2463), we use the most is type=128 echo request and 129, Echo reply.~~~~ Echo Request message (Echo Request)type=128, code=0.650) this.width=650; "Style=" background-image:none;border-bottom:0px;border-left:0px;padding-left:0p

said to be the most famous application of ICMP when we do not go on one of the sites. This site is usually ping. Ping will show back some useful information. General information is as follows:Reply from 10.4.24.1:bytes=32 timeReply from 10.4.24.1:bytes=32 timeReply from 10.4.24.1:bytes=32 timeReply from 10.4.24.1:bytes=32 timePing statistics for 10.4.24.1:Packets:sent = 4, Received = 4, Lost = 0 (0% loss),

addresses over Ethernet, their values are 6 and 4, respectively. The operation field indicates four operation types: ARP request (value: 1), ARP response (value: 2), and RARP request (value: 3) and RARP response (value: 4 ). The following four fields are the sender's hardware address (in this example, the ethernet address), the sender's Protocol address (IP

network_utilities.c: Set the IP address and MAC address; (4) simple_socket_server.h and simple_socket_server.c: the main program of the project, including the task scheduling priority, default ipsettings, sockets, and various task scheduling; (5) led. C: LED, seven-segment digital display program; (6) iniche_init.c: main function of the program. Iv. Analysis of experiment results The running result of niosii is as follows: After 2 mi

information is as follows:Reply from 10.4.24.1: bytes = 32 time Reply from 10.4.24.1: bytes = 32 time Reply from 10.4.24.1: bytes = 32 time Reply from 10.4.24.1: bytes = 32 time Ping statistics for 10.4.24.1:Packets: Sent = 4, stored ED = 4, Lost = 0 (0% loss ),Approximate round trip times in milli-seconds:Minimum = 0 ms, Maximum = 0 ms, Average = 0 msThe word ping is derived from the sonar location, and t

by ccproxy→ "account" → "Allow all" in "allowed Scopes").(3) test agent①on the XP machine specifies the use of a proxy server : Open ie→ tools → Internet options → connections tab → LAN settings → Enter IP and ports in the proxy server (as in the ip:192.168.80.20 above, port 808)② Browse the site. Then, with Netstat-an , you can see only the TCP connection that was established with the Web proxy . You can also see this information in the "Monitoring" of WIN2003 's agent service software.9th App

TCP/IP protocol Learning (4) C # Socket-based Web Server --- static resource processing, A Web server is the host of a Web resource. It must process requests from a browser on the user side and specify the corresponding Web resource to be returned to the user. These resources not only include HTML files, JS scripts, and jpg images, it also includes dynamic content generated by software. To meet the above re

alias, unalias name revocation alias; ② command history: Histsize and Histfilesize The total number of bars by default is 1000 The current user's command history file is placed in the ~/.bash_history, history is used to perform command history operations, you can change the historical record by Histcontrol the environment variable value, histcontrol= Ignoredups is used to ignore consecutive and identical duplicate commands, ignorespace means that the command that starts with a white space chara

Step 4: getting started with Protocol Buffers in Java Protocol Buffers (protobuf) is a Google technology used to serialize and deserialize structured data, which is often used for network transmission. This product is actually similar to XML generation and parsing, but protobuf is more efficient than XML, but protobuf generates bytecode, which is less readable th

Scheme Jump ProtocolOverview: The scheme in Android is an intra-page jump protocol, a very good implementation mechanism, by defining their own scheme protocol, it is very convenient to jump to the various pages in the app,Through the scheme protocol, the server can be customized to tell the app which page to jump to, you can customize the jump page through the n

IOS learning-UiViewController with value jump and Protocol Implementation (4), uiviewcontroller jump We all know that every page in Android is an Activity, and Intent is the link connecting the Activity. In IOS, every page is a UiViewController, while in IOS, the redirection directly works through navigationController pushViewController: you can assign values to the redirected page. In android, the value is

To the new company after the computer to re-install the operating system, from XP replaced by Win7, installed after the system needs to configure IP to network.Before setting the IP to determine the computer card driver has been installed, otherwise there is no way to carry out the following steps.1. Open the Control Panel (note "View mode" is "category"), click "View network Status and Tasks" under "Network and Internet" as shown in2. Click "Change adapter Settings" in the following screen3, se

RTSP-RFC2326 protocol format analysis 4-SETUPSETUP rtsp: // 10.45.134.29: 8554/hsf-esvideotest/track1 RTSP/1.0 --- create a transmission request, resource, and protocol information CSeq: 3 producer information IDUser-Agent: testRTSPClient.exe (LIVE555 Streaming Media v2013.10.25) // ClientTransport: RTP/AVP; unicast; client_port = 52736-52737 -------------------

the English translation in the agreement, and then combine the process diagram to understand what is going on, finally, we can use the code to understand what the data transmission process is like. The following is a translation of the data transmission mode in the English protocol: Data transmission mode (translation ): The controller uses the FOD clock frequency before the SD card recognition mode ends. In data transmission mode, the Controller m

the function name itself is a variable. For function declarations and function expressions as shown below, it is very useful to understand that a function in JavaScript cannot be overloaded without considering the difference between a function declaration and a function expression.1 function f (a) {2 return a + 3} 4 5 function f (a) {6 return a-10; 7} 8 9//without considering the difference between function declaration and function expressi

is the session Startup type. (B) The read ID is 0x30, which indicates a hello data block. 2. Continue to read packet data as follows: Request. read8 (); // skip unknown Uint8 epdlen = request. read8 ()-1; // read EPD Length Uint8 type = request. read8 (); // read type String EPD; Request. readraw (epdlen, EPD); // read EPD String tag; Request. readraw (16, tag); // read the tag Response. writestring8 (TAG); // write the tag to response, which is required by the

In network applications, we will focus on the introduction of Layer 4. For most applications, we will involve the layer-4 TCP and UDP protocols. Therefore, there are many articles about these two protocols. This article will focus on the relationship between the two and the way they work. User Datagram Protocol (UDP) Applications that require minimal network over

Java 2 platform version 1.3 is a Java image API (reflection API) adds an extremely practical extension: Dynamic proxy class. A dynamic proxy class is a class that implements a series of interfaces specified during runtime. This proxy can make . In other words, you can directly call any method of any interface on the proxy object-of course, you must first set the necessary type (casting ). Therefore, we can use a dynamic proxy class to connect a group Create a type-safe proxy object without havin