Never use TELNET ! How to configure SSH on a Cisco Router.

décembre 26, 2022 Mourad ELGORMA

Welcome to Network Engineer Pro. I’m Rafael, CCIE #64356.

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TELNET should never be used in a production network it’s unsecure and the data can easily be seen in a packet capture.

I show you this live on the cli. After telnetting to another router, the wireshark capture is examined and we can easily see the data being sent across including the usernames, passwords and more.

The more secure way to remotely manage devices is to use SSH. SSH is a network protocol used to remotely access and manage a devices. The main difference between Telnet and SSH is that SSH uses encryption, which means that all data transmitted over a network is secure from eavesdropping.

After SSH is configured and tested, I go back to the wireshark capture for analysis and we can see the data going across is encrypted. This is what you want especially in production environments.

I hope everyone enjoyed the video, if you did be sure to like and subscribe.

Here is the config used in the video on R2.
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hostname R2
ip domain name networkengineerpro.com
username admin privilege 15 password cisco
crypto key generate rsa
ip ssh ver 2
!
line vty 0 4
login local
transport input ssh
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#CCNA #CCNP #CCIE

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