Practice Exercise 2: telnet

Objectives

Establish a telnet connection to a remote server.

Scenario

You are on an instance (web1) and want to connect to another instance (db1)

Tasks

• Enable the telnet service on db1 by using the command below:

  sudo systemctl start telnet.socket --now
  

• While connected to the web1 instance use the following command to connect to the db1 that will act as a telnet server.

  telnet <name>-a1t-inf-ds-db1.acad.opswerks.net 23
  

• It will then ask for your login credentials. Use your usual username and password for Linux.

Note: Ensure port 23 is open

• Disable telnet afterwards, ensure that the port is closed

  sudo systemctl stop telnet.socket --now
  

Conclusion

Telnet is an old but still widely used network protocol that allows remote access and control of computers and devices.