how to packet sniff network

Previously, we talked about libpcap packet capture, especially in the case of a gigabit network, which results in a large number of packet loss and a long time of searching on the Internet. This is probably a method like PF_PACKET + MMAP, NAPI, and PF_RING, I tested PF_RING + libpcap and found that the packet capture p

Transfer from http://blog.csdn.net/wang7dao/article/details/18956401packet, packet, packet, the unit that the information transmits in the Internet, the network layer realizes the packet delivery. A packet of records caught with a grab kit is a bag.The Protocol data unit of

One day, an internet cafe user called our telecom operator to report a fault and asked us to solve the problem. The reason was that the technical staff of the Internet cafe Network Administrator analyzed that the fault was definitely caused by the telecom terminal. After receiving an obstacle message, I checked the information of this Internet cafe and found that the Internet cafe had just been opened for less than a month. So I asked him first: What

. Listener principles Ethernet, a popular LAN technology invented by Xerox, contains a cable from which all computers are connected, each computer needs a hardware called an interface board to connect to Ethernet. The protocol works by sending packets to all connected hosts. The packet header contains the correct address of the host that should receive data packets, because only the host with the same destination address in the data

As a professional forensic guy, you can is not being too careful to anlyze the evidence. Especially when the case was about malware or hacker. Protect your workstation is your responsibility. You're a professional forensic examiner, so don ' t get infected when examining the evidence file or network packet files. A friend of mine, she is also a forensic examiner, became victim yesterday. It ' s too ridiculo

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 s

TCP packet structure network protocol TCP packet structure The Fixed Header length is 20 bytes, and the variable part is 0 ~ 40 bytes. Description of each field: Source port number: source port, 16 bits, range: 0 ~ 65525. Target port number: the destination port, 16 bits, with the same range as above. Sequence number: Data serial number, 32 bits. Each byte in t

Npcap is a project dedicated to the improvement of the current most popular WINPCAP toolkit using Microsoft Light-weight Filter (NDIS 6) technology. The NPCAP project was initiated in 2013 by the Nmap Network Scanner project (founder Gordon Lyon) and Dr. Lo Yang of Peking University, an open source project sponsored by Google, following the MIT agreement (consistent with WinPcap). Based on WinPcap 4.1.3 source code, NPCAP supports 32-bit and 64-bit ar

. The sequence view sorts network requests by the time they are accessed. You can switch back and forth between the two views according to your specific needs.For a specific network request, you can view its detailed request content and response content. If the response is in JSON format, Charles can automatically format the JSON content for you to see.Filtering

This article introduces a basic knowledge about how data packets are transmitted and exchanged in Routers. If you understand this, it will be of great help for you to configure a good network environment. I. Input Problems 1. The original interface can receive any TCP or UDP packets. 2. To receive the original set of interfaces, the first packet to be received must have a complete and correct IP Address Hea

];//target ip address}arphdr_t; Defines the entire arp packet, with a total length of 42 bytes typedef struct arpPacket{EHHDR ehhdr;ARPHDR arphdr;} ARPPACKET, *PARPPACKET; ARP request packet analysis: as shown in the following figure, an ARP request packet 0000 ff 00 0c f1 d4 d9 60 08 06 00 01 ...........'....0010 08 00 06 04 00 01 00 0c f1 d4 d9 60 c0 a8 01 0f .

As network security problems become increasingly serious, network security products have also been paid attention. As the first network security product and the most popular security product, firewall is also favored by users and R D institutions. From the perspective of firewall applications, there are basically two types: