1.3 Analyzing the performance of various configurations and protocols

Transcription

1 1.3 Analyzing the performance of various configurations and protocols Original TCP versus the above modified one: To compare the performance between the operation of TCP with congestion control and the operation of TCP as implemented. The main objective is for students to examine how TCP responds to a congested network. The concepts involved in the lab include network congestion and the host responsibilities for communicating over a network. This lab requires three PC s connected to a switch. One PC is designated as the target host and the other two PC s will transfer a file from the target host using FTP. A load is placed on the network to simulate congestion and the file is transferred, first by the host using the normal TCP and then by the host using the modified version. This procedure is performed multiple times to determine average statistics. The students are then asked to summarize the results and draw conclusions about the performance differences and the underlying implications for hosts operating in a network environment. REQUIREMENTS: One Linux(fedora) Virtual PC s. Two Windows(xp) Virtual PC s. One Windows 7 PC with VMware Workstation FTP-Application layer protocol TCP-Transport layer protocol Internet connection VMware Workstation Wireshark-win rc1 Class C IP Address. NETWORK TOPOLOGY: 1

2 SIMULATION OUTPUT PROCEDURES: 1. Double Click pc-1 and get into Desktop 2. Click the traffic generator 3. Configure as follows 4. Click send button. 5. View the simulation tab 6. And click the Auto Capture/Play button see the animation 7. Increase the Load by providing more PING command 8. Note the packet loss 9. Plot the summary and performance report based on the above study. 2

3 FTP TRAFFIC GENERATION: REAL TIME PROCEDURES: File Transfer Protocol (FTP) is the standard mechanism provided by TCP/IP for copying a file from one host to another. 3

4 FTP uses the services of TCP. It needs two TCP connections. The well-known port 21 is used for the control connection and the well-known port 20 for the data connection. FTP OPERATIONS: USING CONTROL CONNECTION: USING THE DATA CONNECTION: COMMAND PROCESSING: FILE TRANSFER: 4

5 INSTALLING FTP SERVER: STEP1: Start the virtual PC s. Installing FTP server in your Linux Operating system. STEP2: Login to Root user account. STEP3: Installing FTP server from the internet.using Command line Installation. Installing FTP server from the internet. Using GUI mode installation. 5

6 STEP4: Power on the FTP server using Linux commands. (chkconfig vsftpd on) STEP5: Start the FTP server service. Using this command (service vsftpd start) STEP6: Check the FTP server status. Using this command (service vsftpd status) STEP7: Add tcp protocol entries into our Iptables. iptables -A INPUT -p tcp --dport 20 -j ACCEPT iptables -A INPUT -p tcp --dport 21 -j ACCEPT 6

7 STEP8: Enable Linux Machine Firewall. Using this command (setup). STEP9: Assign the ip address to windows xp clients. Host A IP address 7

8 Host B ip address STEP10: Assign the IP Address to FTP server STEP11: Edit the ftp server configuration file. #vi /etc/vsftpd/vsftpd.con 8

9 STEP12: Make some changes and add some lines to your vsftpd.conf configuration file. local_root=public_html use_localtime=yes STEP13: Remove the # symbol. And make some changes. 9

10 STEP14: Add this two lines end of the file. Then save and quit. (:wq). local_root=public_html use_localtime=yes STEP15: Add your FTP login user account to your Chroot_list file. #vi /etc.vsftpd.chroot_list 10

11 Save and quit chroot_list file (Esc:wq). STEP16: Restart the ftp Server (#service vsftpd restart) STEP17: Check the FTP server status (#service vsftpd status) Our FTP server configuration has been completed 11

12 VERIFY FTP SERVER CONFIGURATION: Command Line Interface Login Method Go to Host A or Host B Open host A command prompt window. Type the following command C:/>ftp Enter your FTP Server user name and password to login your FTP server. Type the ftp>ls command List out the ftp server file. 12

13 Get the file from FTP server using ftp>recv sample command Graphical User Interface Login Method: Open Internet Explorer Browser. Type the FTP server address in the address bar. ftp://

14 Enter your FTP server user name and password to login. User name: fedora Password: namasiva Ftp server has been successfully login. Copy files from FTP server. Using normal copy and paste operation. 14

15 Paste the file on your Host A Desktop location. View the file content. Just open it. 15

16 HOST A TCP Protocol Analyzing: Open Wireshark application and select the LAN interface. Start the capture button before the FTP server login. All the incoming and outgoing information s are captured. Our FTP server Login id password also captured. Close the FTP server connection: using Ftp>quit command RESULT: 16

17 Thus the experiment was configured successfully. 17