packet logger

TCP Transmit small packet efficiency issues (translated from MSDN) Http://www.ftpff.com/blog/?q=node/16 Summary: When using TCP to transmit small packets, the design of the program is quite important. If the TCP packet is not in the design scenario, theDelay response, Nagle algorithm, and the importance of Winsock Buffering will seriously affect the performance of the program. This article discusses theseP

Tcpdump for iOS and Android Network Packet Capture tutorial Today, almost all mobile applications interact with servers through network requests. packet capture is an important skill for programmers to diagnose network-related bugs. There are many methods to capture packets: for http and https, you can use Charles to set the proxy. For more extensive protocols, you can use tcpdump or wireshark. Wireshark pr

FW: http://blog.codingnow.com/2006/01/aeeieaiaeioeacueoe.html#comments Comment on the seemingly reasonable network packet protocol from the Internet There is a small project recently, and it seems that it can be completed quickly at the very beginning. Just a very small game, 2d, Image Engine is mature, and I am passionate about Lua over the past few days, use Lua to encapsulate the original C ++ Image Engine. It feels good to use, and the UI is enca

Wireshark and tcpdump packet capture analysis experiences 1. Wireshark and tcpdump Introduction Wireshark is a network protocol detection tool that supports windows and UNIX platforms. I generally only use Wireshark on Windows platforms. If it is Linux, I directly use tcpdump, in my work environment, Linux generally only has a character interface. Generally, Linux uses tcpdump, or uses tcpdump to capture packets and then use Wireshark to open the ana

I. OverviewLinux has already had the packet filtering function since the 1.1 kernel. In the 2.0 kernel, we use ipfwadm to operate on the kernel packet filtering rules. Later, we used ipchains in the 2.2 kernel to control kernel packet filtering rules. In the 2.4 kernel, we no longer use ipchains, but use iptables, a brand new kernel package filtering management t

We know that a gigabit port's wire-speed packet forwarding rate is 1.4881MPPS, The speed packet forwarding rate of the gigabit port is 0.14881MPPS, which is the international standard, but how is it obtained? The specific packets in the transmission process will be preceded by each package 64 (leader) preamble is a 64-byte packet, originally only 512 bit, but in

1. Wireshark and tcpdump Introduction ? Wireshark is a network protocolDetectionToolsIt supports windows and UNIX platforms. I generally only use Wireshark on Windows platforms. If it is Linux, I directly use tcpdump, because Linux in my work environment generally only has a character interface, generally, Linux uses tcpdump, or uses tcpdump to capture packets and then use Wireshark to open the analysis. On Windows, Wireshark uses Winpcap to capture packets, which is encapsulated well and ea

Author: Hunger Garfield (QQ120474) Iojhgfti@hotmail.com Absrtact: For the increasingly rampant denial of service (DoS) attacks on the Internet, this paper analyzes the performance defects of the traditional random data packet tagging algorithm, proposes a new return tracking algorithm based on hash message authentication code, and hppm that the algorithm improves the efficiency and accuracy of the return tracking DoS attack by analyzing its performan

This article summarizes the good, from: http://hi.baidu.com/to_wait/blog/item/3e855931a5a51717eac4af22.html The TCP/IP protocol involves four layers: link layer, network layer, transmission layer, and application layer.The Ethernet data frame is at the link layer.IP packageAt the network layerTCP or UDP PacketsAt the transport layerData in TCP or UDP(Data) at the application layerTheirLink isData frame {IP packet {TCP or UDP

them in the/etc/services file of Linux.FTP-data 20/tcpFTP 21/tcpTelnet 23/tcpSMTP 25/tcp mailWWW 80/tcp HTTP # worldwideweb HTTPWWW 80/udp # Hypertext Transfer ProtocolPop-3 110/tcp # Pop Version 3Pop-3 110/udp In fact, the port number can be used with any services you like to specify, but in order to avoid "finding the wrong door" (unless you deliberately want to hide) people will use some of the more common services (wellKnownServices. However, in the TCP data transmission process, more than

, as determined by target: A. Continue to match next rule B. Make some changes to the packet C. Jump to another chain (that is, start by matching each rule in the chain sequentially) D. Returns the chain that raised the jump (that is, the next rule that continues to match the chain before the jump) E. Drop packet F. Receive packets (i.e. no longer continue to match down, return directly) G. Logging

origin:http://blog.csdn.net/e_wsq/article/details/12835457 For the TCP-based development of the communication program, there is a very important problem to be solved, that is, the packet and unpacking. Since I've been working on network communication programming (about three years), I've been thinking about and improving the way that packets and unpacking are addressed. Here's what I think about this question. If it's wrong, The wrong place, begged ev

Group First, let's look at the concept of the next grouping. The so-called grouping is to divide a packet into smaller packets. For example, for a 10GB packet, it is not always a one-time delivery of the past bar, but it is divided into a number of small packets sent past. Structure diagram for each block of data:File headers are typically descriptive data, such as source and destination addresses, data typ

Transferred from: http://cizixs.com/2018/01/13/linux-udp-packet-drop-debug?hmsr=toutiao.ioutm_medium=toutiao.ioutm_ Source=toutiao.ioRecent work encountered a server application UDP packet loss, in the process of reviewing a lot of information, summed up this article, for more people to refer to.Before we get started, we'll use a graph to explain the process of receiving network messages from a Linux system

Solution to TCP packet sticking problem from http://hi.baidu.com/liuwenfei54/blog/item/24fe282dc1f7de34359bf7e1.html2007-03-07 Currently, TCP/IP communication protocol and its standard socket application programming interface (API) are widely used in network transmission applications ). The TCP/IP transport layer has two parallel protocols: TCP and UDP. TCP (Transport Control Protocol) is connection-oriented and provides high-reliability serv

as follows:/* Ld ate = 1//date: 2009/01/23 Ltime = 2//time: 01:23:23 lmicroseconds = 4 Microsecond resolution: 01:23:23.123123 (for enhanced ltime bit) Llongfile = 8//File full path name + line number:/a/b/c/d.go:23 Lshortfile = 16//File no path name + line number: d.go:23 (will overwrite llongfile) Lstdflags = Ldate | Ltime//Standard Logger initial value */debuglog: = log. New (LogFile, "[Debug]", log. Ldate|log. Ltime|log. llongf

1. Circuit Switching Technology The network switching technology has gone through four stages: Circuit Switching Technology, packet switching technology, group switching technology and ATM technology. Both the Public Telephone Network (PSTN) and the mobile network (including the GSM network and CDMA network) Adopt the circuit switching technology. Its basic feature is that the connection-oriented approach is adopted before both parties can communicate

Basic use of the packet capture tool EtherealThis is a tutorial written by enthusiastic people on the Internet. I have put it into practice and it is very simple, but the basic work is enough. I will organize it for the moment.You can perform basic packet capture according to the steps. 1. Use the prefix parameter settings -- capture option settings Interface: Specifies the interface (NIC) on which the

The protocol number for OSPF is 89, and when OSPF packet multicasting occurs, their TTL is set to 1,1. Packet headerAll OSPF packets are started by a 24-byte eight-bit group header650) this.width=650; "Style=" Background:url ("/e/u261/lang/zh-cn/images/localimage.png") no-repeat Center;border : 1px solid #ddd; "src="/e/u261/themes/default/images/spacer.gif "alt=" Spacer.gif "/>650) this.width=650; "Style="

this This paper mainly introduces the realization of WEBRTC in Nack, Weizhenwei, the article was first published in the Wind network , Id:befoioSupport original, reprint must indicate the source, welcome attention to my public number blacker (Id:blackerteam or WEBRTCORGCN).In WEBRTC, forward error correction (FEC) and packet loss retransmission (NACK) are important methods to resist network errors. FEC adds a redundant error-correcting code to the