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Lab 12 - Telnet and SSH ( I Captured My Own Password in Wireshark — Here's What Telnet Taught Me About Network Security )

DEV Community·Khalif AL Mahmud·24 days ago
#irC9Mdvj
#phase#r1#telnet#note#config#router
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There's a moment in networking that changes how you think about protocols forever. You type a password into a terminal. Then you open Wireshark, follow a TCP stream, and there it is — your password, sitting in plain text, completely readable by anyone on the network. That's Telnet. And that's exactly why this experiment is worth doing. In this post, I'll walk you through how I set up a 4-router network in GNS3, configured Telnet and SSH on Cisco routers, and used Wireshark to visually prove why one protocol is dangerous and the other is essential. The Problem: Why Does This Matter? Most people learn that "SSH is better than Telnet" from documentation. But seeing it live is different. Telnet operates on Port 23 and sends everything — usernames, passwords, commands — as unencrypted plain text over the network. SSH operates on Port 22 and encrypts every single byte using RSA key pairs.…

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