Do the same to select another Telnet packet a few lines down in the top pane. This time, you should see the letter “t” in the bottom pane in cleartext.

Click the link Telnet in the middle pane. Move down three lines select the Telnet packet with source IP address 192.168.2.1 (Figure 9.9). In Figure 9.8, the data content is the letter “s.” Remember that the username used by Telnet is student.ġ4. In the middle and bottom panes, you should see the data content carried by Telnet. In the middle pane of the Wireshark window, click the Telnet link (Figure 9.8). To do so, in the top pane of the Wireshark window, try one of the Telnet packets transmitted from the NIC with IP address 192.168.2.1 to the NIC with IP address 192.168.2.2 (Figure 9.8).ġ2. Once Wireshark has stopped, you can view the captured packets. To stop the packet-capturing process, in the Wireshark window, click the Capture menu, and select Stop from the pop-up menu.ġ1. Enter the following command to exit the Telnet service: exitġ0. Enter the username student and password ubuntu.ĩ. Execute the following command to access the Telnet service: telnet 192.168.2.1Ĩ. To capture the network traffic generated by Telnet, open a new terminal window on the client machine by clicking the Applications menu, Accessories, and Terminal.ħ. Click the Start button to start the packet-capturing process.Ħ. Once the Options dialog is opened, in the Interface drop-down list select eth2, which is the NIC used to communicate with the server machine (Figure 9.7)ĥ.

To do so, click the Capture menu, and select Options from the pop-up menu.Ĥ. After Wireshark is opened, you need to specify the NIC through which to capture the packets transmitted on the network. To start Wireshark, enter the following command in the terminal window: sudo wireshark You will be prompted with a warning message click OK to continue.ģ. To install Wireshark, enter the following command in the terminal window: sudo apt-get install wiresharkĢ. The following steps show you how to install Wireshark on the client machine:ġ.

Sudo wireshark