traceroute packet

Routing RingNetwork Packet Loss This is an actual case of analyzing the causes of a large number of packet loss on the network. The user's network packet loss is very serious, causing a lot of trouble to the user, we try to analyze the cause of packet loss through traffic analysis. Network Environment The user's net

Article Title: Use of the new package filtering structure in Linux2.4 kernel. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. 　　 1. how to filter packets through (traverse) The kernel starts from the three lists (lists) in the "filter" table. these three lists are called firewall chains (firewall chain) or chains (chain ). The three links are INPUT, OUTPUT, a

Data Packet Replay0x00 Introduction This article is about how to modify the data packet and the data packet replay some knowledge and the method. Mainly for the IPS and other "safe box" products, research and development engineers to test the use. 0x01 Data modification Many parameters may need to be modified during the testing of the product. As for the details

When data is transmitted, we often use the TCP protocol to transmit it. When we use a TCP long connection to transmit different types of data, the problem of sticking and unpacking occurs. The production of sticky packs: Sticky packets may occur on the server or in the client, when submitting data to TCP, TCP does not send this data immediately, but waits a short time to see if there are any data to send during the waiting period, and if so, send the two pieces of data out at once, causing the s

Reprint: http://blog.csdn.net/galaxy_fxstar/article/details/5290498 Recently with tcpdump grab bag, found that there are a large number of drops ("packets dropped by kernel"), As follows: Tcpdump-i eth0 DST Port 1234 and udp-s 2048-x-tt >a.pack Packets Captured3043 Packets received by filter2706 packets dropped by kernel Packet Drop Reason: After Google and analysis, the cause of this drop is due to the libcap caught

CDMA2000 standard developed from IS-95 CDMA, and to the mobile phone users backward-compatible, that is, the existing IS-95 CDMA mobile terminals can still continue to use in CDMA2000 network. According to the development of CDMA2000, can be divided into 1xRTT and 3xRTT phase, 3xRTT CDMA2000 provides the maximum 20MHz channel bandwidth and 2.4MB/S data transmission rate. Because of the 3xRTT technology span and equipment investment, the current development of the 1xRTT phase of the product can m

Recently, there have been frequent disconnection of hosts on the network. It was normal at the beginning, but the disconnection may occur after a period of time, sometimes very fast recovery, but sometimes it may take several minutes, this has a huge impact on the work. Initially, I suspected whether it was a physical error. In short, I started to check the most easy-to-start items. No exceptions were found after the check! I suddenly think of the most popular ARP attacks on the Internet, and th

Packet forwarding rate is an important indicator that affects route performance. Here we mainly explain the specific application of packet forwarding rate in routing. There are many indicators when describing the performance of a vswitch, such as switching capacity (Gbps), Board bandwidth (Gbps), throughput or packet forwarding rate (Mpps) and so on. The most imp

ICMP Packet AnalysisI. Overview:1. ICMP allows the host or route to report errors and provide relevant exceptions. ICMP is a standard protocol for the Internet, but ICMP is not a high-level protocol, but an IP layer protocol. Generally, ICMP packets are used by the IP layer or higher-level protocols (TCP or UDP. Some ICMP messages return error messages to the user process.2. The ICMP packet is used as the d

TCP/IP packet structure In general, we only need to call encapsulated functions or components to complete most of network programming. However, in some special cases, we need to have a deep understanding of the structure of network data packets, and protocol analysis. Such as network monitoring and troubleshooting ...... The IP package is insecure, but it is the foundation of the Internet and widely used in various aspects. There are more than 10 pro

1. tcpdump is a good tool for tracking the system behavior of processes in the local machine. in the debugging of network problems, tcpdump is an indispensable tool, like most excellent linux tools, it features simplicity and power. By default, tcpdump does not capture packets for internal communication on the local machine. According to the network Association I,Tcpdump Strace is a good tool for tracking system behavior calls of processes in the local machine. in network debugging, tcpdump is a

In order to prevent crawlers from crawling articles on unscrupulous websites, we hereby mark and repost the source of the article. Laplacedemon/sjq. Http://www.cnblogs.com/shijiaqi1066/p/3898248.html Overview The tcpdump command is a Linux packet capture command tool that is powerful and easy to use. Tcpdump is developed based on the underlying libpcap library and requires the root permission to run the program. Basic usage and Command Options For e

I. Overview: 1. ICMP agrees to report errors on the host or route and provides relevant exceptions. ICMP is a standard protocol for the Internet, but ICMP is not a high-level protocol, but an IP layer protocol. Generally, ICMP packets are used by the IP layer or higher-level protocols (TCP or UDP. Some ICMP messages return error messages to the user process. 2. The ICMP packet is used as the data of the IP layer datagram, And the header of the datagr

During the packet capture module, we have seen some data packet interception methods as follows:1. Use the pcap software package. The Linux version of pcap is the Libpcap function library, and the corresponding function library in Windows is Winpcap. The protocol analysis software etheral is implemented based on this software package (but not limited.2. Use the original socket. For example, the UDP proxy se

Packet is a data unit in TCP/IP communication transmission ". Some people say, isn't the frame transmitted in the lan? Yes, but the TCP/IP protocol works on the layer 3 (Network Layer) and Layer 4 (Transport Layer) of the OSI model, while the frame works on the Layer 2 (data link layer ). The content of the previous layer is transmitted by the content of the next layer. Therefore, in the LAN, "packets" are contained in "frames. The OSI (Open System In

Analyze the network traffic of this host After determining that a large volume of sent traffic on the host is the main cause of network congestion, we need to further analyze the traffic on the host, that is, what the host is doing on the network, it can be referred to as analyzing his network behavior. First, we analyze the network traffic flow of the host, that is, to whom it sends packets. We use the Matrix Function of Sniffer to monitor. Host session Through the Matrix of Sniffer, we found

digits. Okay, you have another problem. Even so, 1 M = 1048756 then 8 = 131072 then 1024 = 128 K. There should also be 120 K. Why is the download speed still very low to K, and K is thankful. After reading this article, your account is correct ...... IP packet structure:, A scale represents 1 binary bit (BIT ). 1-1. the four-digit version indicates the version number. Currently, the most widely used version is 4 = B1000, which is also known as IPv4.

Wireshark Packet Analysis data EncapsulationData encapsulation refers to the process of encapsulating Protocol data units (PDUs) in a set of protocol headers and tails. In the OSI seven-layer reference model, each layer is primarily responsible for communicating with peers on other machines. The process is implemented in the Protocol Data Unit (PDU), wherein each layer of PDU is generally composed of the protocol header, protocol tail and data encapsu

Wireshark Packet Analysis Data encapsulationData encapsulation refers to the process of encapsulating Protocol data units (PDUs) in a set of protocol headers and tails. In the OSI seven-layer reference model, each layer is primarily responsible for communicating with peers on other machines. The process is implemented in the Protocol Data Unit (PDU), wherein each layer of PDU is generally composed of the protocol header, protocol tail and data encapsu

[ keywords ] TCP IP Packet architecture specifically interprets network protocolsIn general, network programming we just need to call some packaged functions or components to complete most of the work, but in some special cases, we need to understand deeplyThe structure of network packets, and protocol analysis. such as: network monitoring, troubleshooting, etc...IP packet is not secure, but it is the found