Wireshark's grasping telnet password

Background environment:

When it comes to telnet and ssh knowledge, it's important to mention that Telnet is not safe in plaintext, that passwords are compromised, and that there is an interest in experimenting.

One: Tools

①windows 7 PC machine; ②gns3;③wireshark

Second: test steps

①windows 7 turning on the Telnet service

Ip:192.168.0.100/24

②GNS3 build up the environment.

Router Configure the password for IP and telnet connection: 123456

③ Test connectivity (PC firewall off)

④ Grab Bag

In GNS3, right-click on the Cable, menu select Start WireShark

⑤telnet to the router and enter the password

⑥ viewing message information

Search in turn:

Three: summary

At this point, the password 123456 is caught, so it is very unsafe to prove that Telnet plaintext transmission, so it is recommended to use SSH.

Wireshark's grasping telnet password