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FEC (Forward error Correction) forward error correction UDP\RTP used to improve wireless and other network packet loss problems The algorithm is not introduced at this stage. Idea: FEC ENCODE adds redundant packets, and when the wireless network drops packets, the receiver uses redundant packets to decode the lost packets. Example: 10 packets, the code will ad
Recently, I promised to help people solve a problem, that is, to analyze an online video. It is a client player, but some audio sniffing devices cannot sniff the address. So I found a bunch of network packet capture and listening tools on the Internet. However, these tools made people feel very uneasy and did not dare to experiment with their own computers. So I started the VPC and used the VPC for the expe
Clone Zabbix's own template ICMP ping templates 650) this.width=650; "Src=" Http://s5.51cto.com/wyfs02/M01/86/F3/wKioL1fPrcLi2YxjAAByYarcCOM203.jpg-wh_500x0-wm_3 -wmp_4-s_2806794333.jpg "title=" ping 202.96.209.5.jpg "alt=" Wkiol1fprcli2yxjaabyyarccom203.jpg-wh_50 "/>Here I make a network delay template to 202.96.209.5 Shanghai DNS650) this.width=650; "Src=" Http://s3.51cto.com/wyfs02/M02/86/F3/wKioL1fPrnnS2DkyAACNTuKAcik725.jpg-wh_500x0-wm_3 -wm
This article introduces some programming of the original socket (raw socket) implemented by C # in Windows Sockets and the network packet Monitoring Technology Based on this. Compared with winsock1, Winsock2 supports the raw socket type most obviously. Using raw socket, you can set the NIC to the hybrid mode. In this mode, we can receive the IP packet on the
Solution 1: Disable all switches in the LAN five minutes later. Power on again to check if the network is back to normal! (Cause: it may be that the switch has used up its memory for a long time without restarting, resulting in slow data exchange speed or congestion caused by network storms) (another possible cause is that one or more interface modules of a vswitch are damaged, or an internal
The so-called zero copy means that there will be no inter-memory copy during the packet sending and receiving process of a node. When the packet is sent, the user buffer of the application will directly go through the network interface to reach the external network, when receiving, the
more than 1000 lattice. The space capacity of each lattice is limited. When large data needs to be stored, the whole capacity is sufficient, but the capacity of the small lattice is not enough. At this point, there will be a problem of packet loss. It appears that memory is sufficient at this time, but there is no contiguous space in memory to store the data at this time. So these seemingly large available memory, in fact, can not save much data.
Packet Tracer 5.2 Experiment (15) network port address translation NAPT configurationFirst, the experimental target Understand the principle and function of NAT network address translation; Master NAPT configuration, realize LAN access to the Internet; Second, the experimental backgroundCorporate office netw
The internet has the ability to provide transmission service for distributed applications on the end system, which is related to the ability of packet switching network to transmit packets between many end systems, which is associated with network performance.This lesson mainly studied 1,. Time delay 2, packet loss rat
viewing UDP packet datasudo tcpdump UDP | grep 18060Tcpdump-i eth1 ' Port 18060 '#指定端口打印详情命令 (Eth1 on behalf of the network card number)Tcpdump-vv-x-x-s 1500-i eth1 ' Port 18060 '#指定端口抓包 and write filesTcpdump-i eth0 Port 18070-w dump.pcap#指定ip抓包 and write filesTcpdump-i eth0 host 10.30.17.21-w Dump.pcap#指定ip和端口抓包Tcpdump-i eth0 host 10.30.17.21 and Port 18070-w dump.pcapPackage parsingWireshark Analysis Pca
Using the original socket to implement a simple acquisition network packet and reverse parsing IP,MAC address # include #include #include #include #include #include #define BUFFER_MAX 2048int main (int argc, char **argv){int rawsock;Char Buffer[buffer_max];Char *ethhead;Char *iphead;Char *phead;Creating the original socketif ((Rawsock=socket (Pf_packet,sock_raw,htons (ETH_P_IP))) printf ("Error:create raw s
Tags: process proc ima RAC Technology share static term ADOBy configuring static routes, you can achieve an increase in routing entries for routers in a relatively simple network.However, if there are more than 20 routers in a network, it is difficult to configure static routes to accommodate the complexity of routing entries and changes in the network. At this point we can use the RIP protocol to configure
Programming Requirements: Capture the IP packet of the native network card to resolve the captured IP packet. The following fields must be output: Version number, total length, flag bit, slice offset, protocol, source address, and destination address. The TCP/IP protocol defines a packet that is transmitted over the In
Communication between the bound dual-network port device: Packet recognition-Linux general technology-Linux programming and kernel information. For details, see the following. An embedded device with two network ports on it. I bound them to one for use and communicated with the server for multicast. The multicast address is 227. 0. 0. 1. When both
In the past, when I learned socket programming, I simply called Microsoft's API functions and seldom considered network exception handling. In actual projects, network exceptions must be considered. Network disconnection Exception Handling: Heartbeat network heartbeat Packet
1. TCP/IP layered model Of course, here we will only discuss the important layer-4 01. Application Layer (Application Layer): the Application layer is a broad concept. It has some similar system-level TCP/IP applications and Application protocols, as well as many enterprise applications and Internet applications. The http protocol runs at the application layer. 02. Transport Layer (Tanspot): the transport layer includes UDP and TCP. UDP does not check packets, while TCP provides transmission gua
The network packet size and transmission speed are useful in UDP and almost useless in TCP. For example, if MTU in Ethernet is 1500 and valid data of a packet sent in UDP is 10 bytes, a packet must have 20 bytes of IP header, for 8-byte UDP headers, the valid data rate sent over the
Modify shared bandwidth packets-Increase the public network IP Describe Increase the public network IP in the specified shared bandwidth packet Request parameters name type must describe action string system specified parameters, values: Addbandwidthpackageips regionid string
Learning computer network for a long time, but always confined to the book knowledge, feeling get not focus. After senior proposal with Wireshark grab packet analysis look.I have not done my own scratch bag analysis, so this blog post may have a lot of errors, but I own a record, the passing of the pro do not as a tutorial, so as not to go astray ....TCP protocol Header:Set in filter to:IP.DST = = 222.199.1
Found on the Internet a handy tool for Packetsender, packet transmitters. For the Writing network program, there is great convenience. Although the Netcat tools are very useful under Linux, this is also good.Originally in English, to translate a bit. This is based on QT development. There are some places where the translation is wrong, please correct me.This article by Mob Lym fabricated, welcome reprintblo
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