ethernet sniffer

introducing the concept of SNI er, we must first introduce some basic concepts of LAN devices.Data is transmitted in a small frame unit on the network. frames are composed of several parts and different parts perform different functions. Frames are driven by a specific network Program The software is molded, and then sent to the network card through the network card, through the network cable to reach their target machine, at the end of the target machine to execute the opposite process. The

Today, I suddenly think of this problem: Wireshark can catch the other host's package, because of the shared Ethernet; So now switched Ethernet how to use Wireshark?Read some information on the Internet, organized the following articleSniffer (sniffer) is a commonly used method of collecting useful data, which can be a user's account number and password, which ca

From -- http://blog.csdn.net/zhangnn5/article/details/6810347 Reading this articleArticleBefore that, I suppose you already know the TCP/IP protocol, ARP protocol, What Is sniffer, and other basic network knowledge.In a General Lan, there are usually two access methods, one is hub access (The Hub here refers to the general hub ), one is direct access from a vswitch (the vswitch here is a relatively advanced vswitch, which is not included in the old-

Author: Xia zhongyu1. Meanings of sniffer and snifferSniffers (sniffer) has nearly the same history as internet. sniffer is a common method for collecting useful data. The data can be user accounts and passwords, or commercial confidential data. With the increasing popularity of Internet and e-commerce, the security of the Internet has been paid more and more att

With the increasing popularity of Internet and e-commerce, the security of the Internet has been paid more and more attention. Sniffer and Forward play an important role in Internet security risks. This article will introduce Sniffer and how to block sniffer. Most hackers only detect and take control of hosts on the Intranet. Only those "ambitious" hackers Instal

Principles of network sniffing tools sniffer wireshark Today, I suddenly think of this question: the reason why wireshark can catch packets from other hosts is shared Ethernet. How can I use wireshark for switched Ethernet? I read some documents online and sorted out the following article. Sniffer is a common method f

○ Collation This article was written one year ago and was not completed for some reason. Today, I sorted out shadowstar's home and accidentally found this unfinished article. Although it was a year ago, it is still not out of date and should be helpful to anyone who wants to know sniffer. My father said that everything should start and end. Today is the Dragon Boat Festival. I would like to send a message to my loved ones who are far away from each ot

BKJIA recommendation: Sniffer security technology from entry to entry Learning the concept and principles of Sniffer is the foundation of Sniffer security technology. How should we get started with the knowledge of Sniffer security technology? Next let's introduce it to you one by one. 1. What is

bandwidth usage to potential network attenuation, Sniffer reporter provides detailed data to help you plan future network requirements. available reports on Ethernet and licensing rings include host tables, matrices, protocol distribution, global statistics, and other reports.Sniffer voice options:Sniffer voice is a value-added package integrated with sniffer po

topology of network sniffer connected through port Aggregation Currently, some small and medium-sized enterprises only use non-Network-managed switches to build local networks because of their small network size or to save IT costs. For non-Network-managed switches, we cannot use the port aggregation function to access the network sniffer. So what methods should we use for the network environment built by

Sniffer is a technology that uses computer network interfaces to intercept data packets destined for other computers. This technology is widely used in network maintenance and management. It works like a passive sonar, silently receiving various information from the network. Through the analysis of this data, the network administrator can gain an in-depth understanding of the current running status of the network to identify potential problems in the

PHP-made port sniffer--you can specify the website and port and return the sniff results. function Http_request ($server, $port) { $data = ""; $query = "head/http/1.0"; $fp = Fsockopen ($server, $port); if ($fp) { Fputs ($FP, $query. " Rnn "); while (!feof ($fp)) { $data. = Fread ($fp, 1000); } Fclose ($FP); } return $data; } ?> if ($action = = "Query") { $data = Http_request ($server, $port); echo "Connected to $server on port $port. ";echo "Outp

parsing.The last three lines of code are specific applications where we use pcapy for data capture.pcap = pcapy.open_live(dev, 1500, 0, 100)Open_live method The first parameter is the device to be opened, the second parameter is the size of the capture packet, whether the third parameter turns on promiscuous mode, the fourth parameter is the delay time to wait for the packet, and the method returns a Pcapy object.pcap.setfilter(filter)Call the SetFilter method to set the filter.pcap.loop(0, han

and non-classic communication. SSH was later developed into F-SSH, providing high-level, military-level encryption of the communication process. It provides the most universal encryption for network communication through TCP/IP. If a site uses a F-SSH, the user name and password are no longer important. Currently, no one has broken through this encryption method. Even Sniffer, the collected information will no longer be valuable. For more information

communication. SSH was later developed into F-SSH, providing high-level, military-level encryption of the communication process. It provides the most universal encryption for network communication through TCP/IP. If a site uses a F-SSH, the user name and password are no longer important. Currently, no one has broken through this encryption method. Even sniffer, the collected information will no longer be valuable. For more information, see ssh-rela

As Linux becomes more and more widely used in the network, its security issues are getting more and more attention. This article mainly introduces the working principle and preventive measures of the sniffer technology. What is a sniffer? Sniffer is a device that can capture network packets. Sniffer is a

download it from www.tcpdump.org.Before installing Wireshark on Windows and Linux systems, you must first ensure that you have installed WinPcap or linpcap on your system. 1.1 is the main interface of Wireshark when it is running under Windows System.　　2, Tcpdump and WindumpTcpdump is one of the oldest and most frequently used network protocol analysis software, and it is a command-line based tool. Tcpdump filters the traffic to be captured on the network interface card by using a basic command

Sniffer has always been an annoying hacker tool because it is a static attack software and its existence does not leave any trace, therefore, it is difficult for people to pull it out. However, it is quite harmful (it is like a monitor, and your "every action" is under its surveillance, you say it is not very harmful ). Therefore, it is necessary to find a way to check whether there is sniffer in the networ

commercial confidential data. Sniffer is a common method for collecting useful data, which can be user accounts and passwords, or commercial confidential data. 　　 Ethernet sniffing refers to listening for packets transmitted on an Ethernet device to discover packets of interest. If a qualified package is found, store it in a log file. These conditions are usuall

Sniffer has always been an annoying hacker tool because it is a static attack software and its existence does not leave any trace, therefore, it is difficult for people to pull it out. However, it is quite harmful (it is like a monitor, and your "every action" is under its surveillance, you say it is not very harmful ). Therefore, it is necessary to find a way to check whether there is Sniffer in the networ