netflow packet

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

Author: sodimethyl Source: http://blog.csdn.net/sodme statement: This article can be reproduced, reproduced, spread without the consent of the author, but any reference to this article must indicate the author, source and the statement information of the bank. Thank you! The packet analysis method is simple and simple, that is: comparison! We need to constantly compare and analyze packets from different perspectives, and make full use of your imagin

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

[Scenario description] The client is started, and the server is started. The client initiates a connection The client sends a packet containing the four bytes of "Hutu" Client disconnection, server disconnection [Process diagram]No picture, no truth! [Socket status change diagram]No picture, no truth! Establish a connection protocol (three-way handshake) (1) the client sends a TCP packet with SYN

Recently in the socket transmission, encountered packet loss problem, troubled for a long time, saw this article, the original address: http://suwish.com/html/java-tcp-socket-stream-packet-split.html is good, now much easier. In other words, the official "empty track" animation schedule of falcom and the broken people are displayed. I mean it is really unacceptable. Of course, we can't handle this either. W

The process of sk_buff encapsulation and Network Packet encapsulation is described in detail.It can be said that the sk_buff struct is the core of the Linux network protocol stack, and almost all operations are performed around the sk_buff struct, its importance is similar to that of BSD's mbuf (I have read "TCP/IP details Volume 2"). What is sk_buff?Sk_buff is the network data packet itself and the operati

on the network. Therefore, the network analysis tools in the system are not a threat to the security of the local machine, but a threat to the security of other computers on the network. Tcpdump is defined as simple as possible, namely: dump the traffice on anetwork. a packet analysis tool that intercepts packets on the network according to the user's definition. As a necessary tool for the classic system administrator on the Internet, tcpdump, with

transmits data packets, if the length of the IP datagram plus the data frame header is greater than MTU, the data packets are divided into several parts for transmission and reorganized in the target system. For example, the maximum IP packet size (MTU) that can be transmitted over Ethernet is 1500 bytes. If the size of the data frame to be transmitted exceeds 1500 bytes, that is, the IP datagram length is greater than 1472 (1500-20-8 = 1472, normal

of the IP datagram plus the data frame header is greater than MTU, the data packets are divided into several parts for transmission and reorganized in the target system. For example, the maximum IP packet size (MTU) that can be transmitted over Ethernet is 1500 bytes. If the size of the data frame to be transmitted exceeds 1500 bytes, that is, the IP datagram length is greater than 1472 (1500-20-8 = 1472, normal datagram) bytes, the data frame needs

This is an article I wrote before in the green corps. It was originally written by myself. I learned from a t00ls article and made improvements. The name of my account in the green corps is also leisureforest.There is no doubt about the authenticity. ThanksDatabase packet capture alternative backupAddress http://www.bkjia.com/(used only to replace the target website, not this site)Database packet capture al

used to specify the maximum life cycle of each packet on the Internet. Each intermediate router reduces the TTL value by one before forwarding the IP packet to the next hop. A. Extract the final TTL value When a data packet arrives at the destination address to extract the TTL field value, this value is called the final TTL value. The challenge of hop count stat

From: http://blogread.cn/it/article.php? Id = 3908 & F = sinatiostat view disk I/O [root@localhost ~]# iostat -d -x 2 extended device statisticsdevice mgr/s mgw/s r/s w/s kr/s kw/s size queue wait svc_t

Wireshark and TcpDump packet capture Analysis and Comparison Common packet capture analysis tools include Microsoft's Network Monitor and Message Analyzer, Sniff, WSExplorer, SpyNet, iptools, WinNetCap, WinSock Expert, Wireshark, and linux tcpdump. Today, we conducted an experimental test to compare and analyze two of them. Other users can use Baidu Google to test yiha ^_^. 1. Wireshark and tcpdump Introduc

I don't know how to say it. In short, the boat, from the mouth, I can not see HUANGFA and impoverished! I'm not going to say anything except cursing!Prior to BBR, there are two kinds of congestion control algorithms, based on packet loss and delay-based, regardless of which is based on detection, in other words, packet loss based on packet loss as a means to find

Packet Capture analysis tool-tcpdump Tcpdump (dump the traffic on a network) is a more practical tool for analyzing data packets in Unix, it supports filtering at the network layer, protocol, host, network or port, and provides logical statements such as and, or, not, and boolean expressions for packet header matching, in Linux, you can use yum to install yum if it is not installed. However, you need the fo

Compared with WINSOCK1, Winsock2 most obvious is to support the raw socket socket type, using raw socket, can set the network card into promiscuous mode, in this mode, we can receive IP packets on the network, of course, including the destination is not the local IP packet,Through the original socket, we can also more freely control the various protocols under Windows, and can control the network underlying transmission mechanism. In the example of th

In the last lecture, we learned how to get the appropriate information, this one will let us write a program Chiang every packet printed through the adapter.The function that opens the device is Pcap_open (). function prototypes arepcap_t* pcap_open (const char* source,int snaplen,int flags,int read_timeout,struct pcap_rmtauth *auth,char * errbuf); 'Pcap_rmatauth{int type.Char *username;;/ /zero-terminated string containing the username that have to i