Network Security Technology Lab 1

Experiment 1 sniffer packet capture

Lab Objectives

L master Serv-U configuration FTP.

L master the basic Telnet usage methods.

L through experiments, master the installation and use of common sniffing tools, and understand the data structure of IP, TCP, UDP, and other protocols in the TCP/IP protocol stack, understand the features of FTP, HTTP, and other protocols for plaintext transmission, establish security awareness, and prevent plaintext leakage caused by transmission of such protocols.

Lab hours: 4

Technical Principles

L Serv-U is one of the numerous FTP server software. By using Serv-US, users can set any PC as an FTP server, so that users or other users can use the FTP protocol, by connecting any PC on the same network to the FTP server, you can copy, move, create, and delete files or directories. The FTP protocol mentioned here is used to specify the standards and rules for file transfer between computers. It is precisely because of the special protocols such as ftp, so that people can use different types of operating systems to transfer different types of files through different types of computers.

L Telnet is a member of the TCP/IP protocol family. It is the standard protocol and main method of the Internet remote login service. It provides users with the ability to complete remote host work on local computers. Use the telnet program on the terminal user's computer to connect to the server. End users can enter commands in the telnet program. These commands will run on the server, just as they are directly entered on the server console. You can control the server locally. To start a telnet session, you must enter the user name and password to log on to the server. Telnet is a common method to remotely control web servers.

L sniffer is a network sniffer used to listen to packets in the network and Analyze network performance and faults. It is mainly used for network management and maintenance. It can be used to diagnose difficult problems that are difficult to solve through conventional tools, including abnormal communication between computers, communication traffic of different network protocols, the source address and destination address of each data packet, etc., can provide very detailed information.

Tutorial steps:

L install and configure the FTP service

N install Serv-U

N configure IP addresses and Domains

N create an anonymous account and configure Directory Access Permissions

N create an admin account and configure the password and Directory Access Permissions

N ip address segment settings

N other settings

N run the FTP service and observe the access connection

L install and configure the Telnet Service

N open the telnet service for the computer next to it

N use Telnet to access another computer

L install and use sniffer Software

N captures various data packets and analyzes the characteristics of UDP, TCP, and ICMP;

N configure a filter to capture ARP packets and observe and analyze the packets;

N configure the filter, capture ping command access information, analyze and observe data packets

N configure filters, Capture FTP access information, analyze and observe data packets

N

N configure the filter, capture the Telnet access information, and observe the data packets.

N analyzes the data packet and intercepts the Telnet password.

N analyze data packets and intercept FTP passwords

Lab Device

2 pcs; vswitches; Network cables;

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Network Security Technology Lab 1