packet logger

[Reprint] How to receive a complete data packet parsing in the serial port, serial port data packet The serial port is used as the transmission medium to introduce how to send and receive a complete data packet. The process involves packaging and unpacking. A good packet transmission mechanism is designed to ensure the

Network Packet sending tool in linux and network packet sending tool in linuxChapter 2. Description This document applies only to Tcpreplay3.x.Chapter 2. Tcpreplay tools 2nd. Overview First, we recommend a Website: movie. This article is based on the reference of this website and obtained through some experiments. Tcpreplay is a general term for a series of tools, including tcpreplay, tcprewrite, and tcppre

Java socket solves half-packet, sticky-packet problemFirst, the Java socket half packet, sticky problem reasons and solutions See blog: http://www.cnblogs.com/solq/p/4315763.html http://bbs.csdn.net/topics/250027309? page=2 http://blog.csdn.net/pi9nc/article/details/17165171 Second, Java socket half Pack, sticky solution 1, with special strings such as/R,/n as th

PHP implements the red packet sending program, and php implements red packets. PHP implements the red packet sending program. php implements red packet sending using PHP. after we enter the number and total amount of red packets, PHP randomly allocates each amount based on these two values, ensure that each PHP implements the red

When using a mobile phone to receive mail or visit a webpage, it is generally said that there is a "packet fee" (This is the Japanese version, in China it seems generally said "traffic fee"), even if the network is not familiar with the word "packet" (here is also the case of Japan).So, what exactly is "packet"?"packet

Version (4bit) Header Length (4bit) Priority and service type (8bit) Total Length (16bit) Logo (16bit) Logo (3bit) Segmented offset (13bit) Survival Period (8bit) Protocol (8bit) Header Checksum (16bit) Source IP address (32bit) Destination IP address (32bit) Option (0 or 32bit, if any) Data (variable) version The IP version number. Header length 32-bit Word header leng

All the packets in NS2. when we need to create a new packet, we call the packet: alloc method. Let's take a look at what packet: alloc has done: Inline packet * packet: alloc () {packet * P = free _; If (P! = 0) {assert (p-> fflag

Reposted for study 1,Data Link LayerThere is a limit on the length of the data frame, that is, the maximum data length that the link layer can bear. This value is called the maximum transmission unit (MTU. Taking Ethernet as an example, this value is usually 1500 bytes. 2. for IP packets, there is also a length. In the IP packet header, the length of the IP packet is described in 16 bits, that is, an IP

WireShark data packet analysis data encapsulation, wireshark data packetWireShark packet analysis data encapsulation Data Encapsulation refers to the process of encapsulating a Protocol Data Unit (PDU) in a group of protocol headers and tails. In the OSI Layer-7 reference model, each layer is primarily responsible for communicating with the peer layer on other machines. This process is implemented in the Pr

Php implements the red packet distribution algorithm. The implementation method of the php imitation red packet distribution algorithm. the example in this article describes the implementation method of the php imitation red packet distribution algorithm. For your reference, The following describes how to implement the php red

Simple packet capture Analysis in linux and packet capture in linux Sometimes we may encounter some problems that require packet capture analysis. When there is no professional packet capture tool at hand, we can use tcpdump instead (this tool is provided in general releases) For example, we need to analyze the

Http://hi.baidu.com/ahtaria/blog/item/969ae4447eaa59076a63e57d.html Libpcap focuses on the BPF (BSD Packet Filter) packet filtering mechanism. BPF was designed in 1992 to solve the inefficiency of the existing filtering mechanism. The BPF procedure is as follows: when a data packet reaches the network interface, the data link layer driver transmits it to the sys

Under Linux, when we need to crawl network packet analysis, we usually use the Tcpdump crawl Network raw packet to a file, and then download it locally using the Wireshark Interface Network analysis tool for network packet analysis.Only recently found that the original Wireshark also provided with the Linux command line tool-tshark. Tshark not only has the functi

CocoaAsyncSocket + Protobuf handles packet sticking and packet splitting issues, cocoaasyncsocket sticks to packets In the previous article "ProtocolBuffer setup and demo for iOS", we shared the establishment of the environment. We used the famous github framework cococoaasynsocket for IM communication with the server, the data medium between the server and server is ProtoBuf. Next, we also encountered the

to a major security risk, as a proof, the "channel" Technology is a good example, which is also discussed in this article. So what is a channel? The channel is a communication method that bypasses firewall port shielding. Packets at both ends of the firewall are encapsulated on the data packet type or port allowed by the firewall, and then communicate with the peer end through the firewall. When the encapsulated data

The PHP public account automatically sends the red packet API and the php public red packet api. PHP public account auto-send red packet API. php public red packet api this article provides an example of the PHP public account auto-send red packet API code for your reference

format, compressed package format is generally included in the file format of the packet. 1 If you are under the installation files of the. apk, copy the file directly to the cell phone's own storage, waiting for transmission completed, turn off the USB storage, MTP mode can be directly unplugged data line. Then open your mobile phone, use "File Management" (or similar to my files, etc.) to open their own mobile disk, find this apk, click In

For an online chat window provided by slice, use httpanalyzer to analyze the packet sent by the window, and then simulate the packet to send the message. The headers obtained through the software are as follows: We can get the post address through the header:/chats/sendmessage. ashx page, and then cookie. The data of post is as follows: For example, the data format can be: chatroomname = homepage

Implementation of the php red packet distribution algorithm and the red packet algorithm This article describes how to implement the php red packet distribution algorithm. We will share this with you for your reference. The details are as follows: /*** Red packet distribution: randomly allocate a certain amount to a

Network packet error probability and packet error probabilityTcp and udp checksum are weak. Simply put, the sum of all values is reversed. Even errors in order cannot be prevented, and there are not many digits, 16 bits. Isn't there a 1/65536 probability that an error will not be detected?Note that the layer of Ethernet is crc verification, and the two are combined to greatly reduce the probability that err