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3 - SSH with Xubuntu Client



3.1 Introduction

This part demonstrates the integration of a virtual client into the network. In this case, a Xubuntu PC is added to the topology, configured with an IP address, and connected to Router R1. The goal is to show secure remote access by establishing an SSH session from the Xubuntu client to the router.

TOPOLOGY-map-3



3.2 Topology

Device Interface Connected to -> Peer Interface IP Address Subnet Mask Gateway
Router R1 Gi0/0 Switch SW1 Gi0/0 192.168.1.1 255.255.255.0 -
Switch SW1 Gi0/0 Router R1 Gi0/0 - - -
Switch SW1 Gi0/1 PC1 (VPCS1) Eth0 - - -
Switch SW1 Gi0/2 PC2 (VPCS2) Eth0 - - -
Switch SW1 Gi0/3 Xubuntu-client Gi0/0 - - -
PC1 (VPCS1) Eth0 Switch SW1 Gi0/1 192.168.1.10 255.255.255.0 192.168.1.1
PC2 (VPCS2) Eth0 Switch SW1 Gi0/2 192.168.1.11 255.255.255.0 192.168.1.1
Xubuntu-client Gi0/0 (ens3) Switch SW1 Gi0/3 192.168.1.20 255.255.255.0 192.168.1.1



3.3 Steps

  1. Add a Xubuntu client to the topology and connect it to SW1.

  2. Configure SSH on Router R1: - Define domain name. - Generate RSA keys. - Create a local admin user. - Enable SSH version 2. - Configure VTY lines for SSH login.

  3. Configure IP address and default gateway on the Xubuntu client.

  4. Test SSH connection from Xubuntu client to Router R1.



3.4 Configuration

Router R1:

enable
configure terminal
ip domain-name lab1.local
crypto key generate rsa
1024
username admin secret admin123
ip ssh version 2
line vty 0 4
login local
transport input ssh
exec-timeout 10
end
write memory

SSH-R1

Xubuntu Client:

sudo ip addr add 192.168.1.20/24 dev ens3
sudo ip route add default via 192.168.1.1

Xubuntu-client

note.: Identify the correct network interface on Xubuntu using ip a (e.g. ens3).

SSH from Xubuntu-client to R1:

ssh admin@192.168.1.1

SSH



3.5 Diagnostics

  1. Verify connectivity by running pings from Xubuntu-client to PCs and Router R1.
ping 192.168.1.10
ping 192.168.1.11
ping 192.168.1.1

xubuntu-clien-ping-test

  1. On Router R1, run show ip ssh to confirm SSH is enabled.
show ip ssh

SSH-test



3.6 Conclusion

This lab demonstrates the integration of a virtual Xubuntu PC into the network and secure remote access to Router R1 via SSH. By configuring IP connectivity and SSH, the Xubuntu client successfully establishes an encrypted session with the router. This validates the use of a virtual client in the lab environment for secure device management.

Back to lab overview: README