Sniffer and network enforcement officer software helps you maintain your network

Source: Internet
Author: User
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Any tool software has a wealth of features, so in the daily maintenance of internet cafes, for a software, not only to know its surface function, but also to understand its working principle, so as to more effectively mining software more advanced applications and functions, in order to solve the network of difficult problems. The following combined with some of the day-to-day network failure examples, introduce sniffer and network law enforcement officer Two network tool software in the Internet Café Network maintenance integrated application.

Sni ffer--Improve network transmission quality good helper

Sniffer software is a powerful protocol analysis software launched by NAI, which has the functions of capturing network traffic for detailed analysis, monitoring network activities in real time, using expert analysis system to diagnose problems, collecting network utilization and errors. Sniffer Pro 4.6 can be run on a variety of Windows platforms and can be monitored throughout the network as long as it is installed on any machine in the network. The following take the sniffer 4.70 Chinese version as an example, introduce snffer in the Internet Café Network maintenance of the specific application.

First, the installation of sniffer software

Download sniffer software on the Internet, directly run the installation program, the system will be prompted to enter personal information and software registration code, after the installation, restart, and then install the sniffer-han patch. After running the sniffer program, the system will automatically search the network adapter in the machine and click OK to enter the sniffer main interface.

Second, the use of sniffer software

After opening the sniffer software, the main interface appears, showing some list of machines and the current operation of the Sniffer software, which is the menu of the software, there are some shortcut Tools menu, and a row of shortcut menu buttons on the left. Because the use of the Chinese version of the software, so some of the words are not too accurate Chinese.

1, get the list of machines in the network

After the sniffer software runs, you first need to search for the machines in the network. On the Tools menu, locate the Address Book option and run, and in the Left tool menu in Address Book, you can find a magnifier icon, which is the "Auto Search" button. After you run the Auto Search feature, enter the start IP address and end address of the network in the IP address segment, and the system automatically searches. When the search is complete, a list of machines appears.

2. Save Machine List

Sniffer search the list of all machines in the network, you can save the current list of machines for later use by selecting the Save Address Book option from the Database menu. Because Sniffer's address book holds the IP address of the client in the network, the MAC address of the NIC, and so on, if the client in the network has replaced the NIC, you must search the list of machines and save the address book again. If no new machines are added to the network, you do not need to update this address book.

Three, sniffer menu and function introduction

Sniffer enter, you need to set the current machine network card information. After entering the sniffer software, you can see the Chinese menu of the sniffer software, the following are some commonly used tool buttons. In the day-to-day maintenance of the network, the use of these tool buttons can solve the problem.

1, Host list button: After saving the machine list, click this button, sniffer will display the information of all the machines in the network, in which, the HW address column is the client information in the network. Clients in the network generally have unique names, so in the HW address bar, you can see the client's name. For machines that install sniffer, "local" is identified in the HW address bar, and sniffer can only display the MAC address of these network devices for network devices such as switches and routers in the network.

The port packet and port packet, which is the number of packets sent and received by the client, followed by the size of the bytes sent and received by the client. You can view the amount of data traffic on your network accordingly.

2, Matrix button: Matrix function through a circular legend to explain the data trend of the client, you can see the machine with the client data exchange. When you use this feature, select the client, and then click on the button.

3, Request Response time button: Request response time function, you can view the details of the client computer access site. When a client accesses a site, this feature allows you to view information such as when a request is sent from a client to a server response.

4, Alarm log button: When the sniffer monitor to the network is not normal, will be automatically recorded in the alert log. So when you open the Sniffer software, first check the alert log to see if the network is working properly.

Application of sniffer in network maintenance--solving the problem of network transmission quality

The application of sniffer in Internet Café network mainly uses its traffic analysis and view function to solve the problem of network transmission quality appearing in Internet café.

1, broadcast storm: Broadcast storm is the most common Internet café network failure. The generation of the network broadcast storm is usually caused by the fault of the client being attacked by virus and the damage of network equipment. You can use the Host List feature in sniffer to see which machines in the network have the most traffic, and combine the matrix to see which machine data flow is abnormal. Thus, we can judge the specific fault points of the network in the shortest time.

2, Network attacks: with the continuous development of the network, hacker technology has attracted a lot of network enthusiasts. So, some of the primary hackers, began to take internet cafes to do experiments, DDoS attacks become some hackers show off their own technology, because the Internet café itself is relatively large data flow, coupled with external DDoS attacks, the network of Internet cafes may appear a short period of interruption phenomenon. For similar attacks, the use of sniffer software can effectively determine whether the network is affected by the broadcast storm or from an external attack.

3, detect network hardware failure: In the network work hardware equipment, as long as there is damage, data flow will be abnormal, using sniffer can easily determine the physical damage of the network hardware equipment.

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