netflow packet

IOS development-use Charles for https packet capture In the previous two blogs, "introduction and use of the network packet capture tool Charles" and "iOS development-detailed explanation of http packet capture using Charles" gave a detailed explanation of Charles's http packet capture. Today, we will implement https

The serial number (sequence number) in a TCP packet is not numbered by the packet segment. Instead, all the data transmitted during the connection life cycle is treated as a byte stream, the serial number is the number of each byte in the entire byte stream. A tcp data packet contains data of multiple byte streams (that is, data segments), and the data size of ea

Ps:tcpdump is a tool for intercepting network groupings and outputting grouped content, which is simply the packet capture tool. With its powerful capabilities and flexible interception strategy, tcpdump is the preferred tool for network analysis and troubleshooting in Linux systems.Tcpdump provides source code, exposes interfaces, and is therefore highly extensible, and is a useful tool for network maintenance and intruders. Tcpdump exists in the bas

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

[Keywords] TCP/IP packet structure explanation network protocol In general, we only need to call some encapsulated functions or components for network programming to complete most of the work. However, in some special cases, we need to have a deep understanding. Network Packet structure and protocol analysis. Such as network monitoring and troubleshooting ...... The IP package is insecure, but it is the fo

Actually, for the tcpdump program, you can even say that this program is actually a customer experience, because not only can he analyze the packet flow direction, but the internal content of the packet can also be "audible". If the information you use is clear, on the router, it may have been heard by others! Awesome! So, let's get to know this experience! (Authorization: This tcpdump must use the root ide

provides a Transport Driver Interface (TDI) to the top, and interacts with the upper border of the NDIS middle layer through the NDIS interface, the bottom boundary of the NDIS intermediate layer interacts with the underlying NDIS miniport driver through the NDIS interface. Finally, the NDIS miniport driver uses the NDIS interface to interact with the netcard of the physical network device. Introduction to NDIS Interfaces The original communication can be viewed as follows: After the pr

Introduction The author was fortunate to participate in the overall project design of the third generation mobile communication technology test network of the Ministry of Information Industry and the design work of the Beijing Area Test Network project. 3G test Network adopts WCDMA R99, CDMA2000 1X, TD-SCDMA three kinds of technology construction. When considering the 3g scheme, we combine the characteristics of 3G network, based on satisfying the requirements of the test, and draw on the exper

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

R1 --------------- (vlan10) SW (vlan20) ------------------ R2Condition: R1: 192.168.1.1 mac: a R2: 192.168.1.2 mac: BSw is a layer-3 SwitchWhen R1 packets are forwarded to R2:When R1 receives the data packet, it queries the route table of R1. The purpose of querying the route table is to find the data packet from that interface. After finding the interface, what type of frames are encapsulated for the purpo

such as the Cisco 2960x-24ps-l (24,000 Gigabit Port 4,000 gigabit), forwarding bandwidth 108Gbps, switching bandwidth 216Gbps, packet forwarding rate 71.4Mpps, according to the non-clogging line speed forwarding to calculate, exchange capacity of 2*28*1gbps=56gbps, The nominal 216Gbps is much higher than this, why? Is it due to the different design of the switch matrix? How did he figure out the 216Gbps? Again, for example: its

Label: style blog HTTP Io ar OS use SP strong Wireshark introduction: Wireshark is one of the most popular and powerful open-source packet capture and analysis tools. Popular in the sectools security community, once surpassed metasploit, Nessus, aircrack-ng and other powerful tools. This software plays a major role in network security and forensic analysis. As a network data sniffing and protocol analyzer, it has become a required tool for network

Recently, RTP has naturally involved the jrtplib library, reading code 3.7.1, spare time, and some excerpt. I hope you can remember it quickly in the future. I also hope your friends can read it and point out improper information, we provide you with valuable suggestions to learn and make progress together.Next, the source code analysis notes are based on: # ifndef rtp_support_thread. The author uses related classes for background threads to process the receipt of RTP packets, however, we will a

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 please keep the author, source and this statement information. Thank you!The common network servers are basically 7x24. For online games, at least require the server to work continuously for more than a week and ensure that no catastrophic event such as server crash occurs. In fact, it is almost unrealistic to req

The 1th chapter, router-based packet filtering firewall General concepts of 1.1 packet filtering firewalls 1.1.1 What is a packet filter firewall A packet filtering firewall is a software that looks at the header of the packet that flows through it, thus determining the fate

Document directory TCP packet TCP Reliability Assurance TCP data packets Source Port and destination port field -- each occupies 2 bytes. Identifies the application process of the sender and receiver. Number Field-4 bytes. Each byte in the data stream transmitted in the TCP connection is a serial number. The value of the serial number field refers to the sequence number of the first byte of the data sent in this section. The validation number

Programming | network Talking about socket programming, we may think of QQ and IE, yes. There are many network tools such as Peer-to-peer, NetMeeting and other applications implemented in the application layer, but also with the socket to achieve. The socket is a network programming interface that is implemented at the network application level, and Windows Sockets includes a set of system components that take advantage of Microsoft Windows message-driven features. The socket Specification versi

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