SSH

In Cisco Packet Tracer, SSH (Secure Shell) is a network protocol that provides secure remote access to devices over an unsecured network, such as the internet. It allows for encrypted communication between the client and the server, ensuring confidentiality and integrity of data transmission. 

To use SSH in Cisco Packet Tracer, follow these steps:

Step 1: Build the network topology Create the network topology by adding devices, such as routers or switches, to the workspace. Ensure that the devices you want to access via SSH are included in the topology.

Step 2: Configure device hostname and IP address Access the CLI (Command Line Interface) of the device you want to configure for SSH by double-clicking on it or selecting it and clicking on "CLI" in the toolbar. Enter the following commands:

enable

configure terminal

hostname <hostname>

interface <interface>

ip address <ip-address> <subnet-mask>

no shutdown

Replace <hostname> with the desired hostname for the device, <interface> with the appropriate interface name (e.g., FastEthernet0/0), <ip-address> with the desired IP address, and <subnet-mask> with the appropriate subnet mask.

Step 3:
Generate RSA key pair To enable SSH on a device, you need to generate an RSA key pair for secure authentication. In the device's CLI, enter the following command:

crypto key generate rsa

You will be prompted to specify the key modulus size (e.g., 1024 or 2048 bits). Choose an appropriate modulus size and proceed.

Step 4: Enable SSH server Enable the SSH server on the device by entering the following command:

ip ssh version 2

This command enables SSH version 2, which is more secure than SSH version 1.

Step 5: Set SSH login credentials To specify the username and password for SSH login, enter the following command:

username <username> privilege 15 secret <password>

Replace <username> with your desired username and <password> with your desired password for SSH access.

Step 6: Save and exit Save the device's configuration and exit the CLI by entering the following commands:

exit

copy running-config startup-config

Step 7: Connect to the device via SSH In the Packet Tracer toolbar, select the "Desktop" tab and click on the "Terminal" application. Enter the IP address of the device you configured for SSH access and click "OK". Enter your SSH username and password when prompted.

You should now be connected to the device via SSH, allowing you to remotely manage and configure it securely.

Remember to repeat these steps for each device you want to configure for SSH access in your network topology.

Router 1: 

ena 

conf t 

router ospf 1 

network 192.168.10.0 0.0.0.255 area 0 

no shutdown 

Router 2: 

ena 

conf t 

router ospf 1 

network 192.168.10.0 0.0.0.255 area 0 

no shutdown 

To view OSPF neighbor information on Router 1: 

show ip ospf neighbor 

To view OSPF protocol information on Router 1: 

show ip protocols 

To establish the SSH connection use the following command:

ssh -l admin 192.168.x.x 

Please note that you need to execute each command separately in the respective router's command line interface (CLI). Replace the 192.168.10.0 with the appropriate network address and adjust the OSPF process ID, if needed, according to your network configuration.

Remember to save the configurations on each router and verify the OSPF neighbor relationships using the show ip ospf neighbor command. The show ip protocols command will display information about OSPF processes and network details.

Ensure that the routers are directly connected and the OSPF configurations are consistent for successful OSPF operation.