Telnet Configuration in Cisco Router

 

About Telnet

TELNET stands for TErminaL NETwork.

Telnet is an application layer protocol that allows a network administrator to access and manage remote devices by plain text format. That's why it is secure A user on a client machine can use a software (also known as a Telnet client) to access a command-line interface of another, remote machine that is running a Telnet server program.

A network administrator can access the device by telnetting  to the IP address or hostname of a remote device. The network administrator will then be presented with a virtual terminal that can interact with the remote host.

Port Number: 23

Video Link: https://www.youtube.com/watch?v=L8tFST9bg1o

Our Purpose: Here, R1 will be our Telnet Server/SSH server. R2 will be telnet client. We will try to connect R1 remotely from R2 router via telnet. 

Telnet Configuration:

Here: Router-1 is Telnet-Serevr   &  Router-2 is Telnet Client

Now we will try capture the “Telnet” Packet by 'Wireshark' packet capturing/analyzing tool.

Note: Before capturing, you should to start capture first, then you have to connect remotely R1 router.

Then stop capturing. 

See the packet 

Here, we are seeing our given input. 

Now, If you want to connect via telnet from your windows machine like - windows-10. you have to enable "Telnet-Client" from "Turn on Windows Feature on/off"

To do this, follow below steps.

Steps:

   1. First  Hold press Window button then press R button from your keyboard, type “optionalfeatures”, and press Enter

                                

   2. Scroll and select "Telnet Client" option

                                                   

        3. If required, restart your machine.

        4. Open command prompt. Type : telnet    remote-ip       ;[Here remote-ip means your telnet/ssh server's IP]

                                

SSH Server Configuration Link: 

 https://itbd-training.blogspot.com/2021/08/about-ssh-stands-for-secure-shel.html