(This seems obvious but it will be quite useful later in a future discussion.) Additionally, for the access lines you must configure either a line password, or local user database for the way to authenticate to the device. Both protocols can be used for remote access but their differences are important to any network technician or engineer.įirst, to gain remote access to the Virtual Terminal Teletype lines (VTY), a router or switch must be reachable with a given routed protocol. We also discussed configuring security features such as banners that can be used for legal purposes.įor this discussion we will compare Telnet and Secure Shell protocol (SSH). These commands included cosmetic commands such as logging synchronous and exec-timeout that can be configured on the console port. Sponsor and Advertise: Get your product or service in front of our 75K followers while also supporting independent automation journalism by sponsoring or advertising with us! Learn more in our Media Guide here, or contact us using this form.In our last blog series we discussed multiple access commands that can be configured on a router or a switch. Have a question? Join our community of pros to take part in the discussion! You'll also find all of our automation courses at. Senior Controls Engineer and Freelance Writer Making changes to a network device always comes with a risk and using SSH is one way to minimize risk and that is what makes it a best practice when performing device configuration. While an IT or OT environment should be behind a firewall and secure, every practice that we can implement to be more secure makes us better than we were before. You can see examples of the differences in data in Wireshark, but maybe that will be a topic for another time. Login with the username (here we used: user) and password (here we used pwtest) and then you can begin your session with encrypted data. In a PUTTY session, put the IP address of the device you are connecting to and select SSH as the connection type. Set the Domain Name and generate the crypto keys as shown below. Setup password encryption, a username and password, set the remote line connection to SSH only as shown below. Setting up SSH on your Cisco or Allen Bradley Stratix Switch SSH uses public-key cryptography to authenticate to the remote device or computer and allow it to authenticate the user.īesides management of your network devices, it supports tunneling, forwarding TCP ports and X11 connection as well as file transfer and secure copy protocols. Secure Shell (SSH) is also a client-server protocol, but it provides a secure channel over even an unsecure network. Anyone that gets access to monitor a user’s connection will gain access to the username, password and any other information because it will be collected in plain text. The problem is, that Telnet is not secure and the data is unencrypted. Telnet is a client-server protocol that works with a virtual terminal connection emulator and allows you to communicate and configure a remote device the same as you are connected to it. Unfortunately, not everyone in the world is looking out for our best interests and the way we do things must be centered around the safest and most secure methods. However, as I’ve learned more about security, I learned that while it works great, it probably isn’t best practice. Telnet worked great for me and I didn’t know much about it, except that it worked and I could manage all of my network switches without leaving my desk. The first Ethernet switches that I configured were in the age that you could buy a laptop with a serial port built in and the normal operating system was Windows XP, so I learned to configure with HyperTerminal software.Īt some point, I started to learn to manage switches remotely with Windows PowerShell and Putty Software using Telnet. That can mean we start with the latest and greatest or legacy equipment as well as the practices that we follow. Does it Matter whether I use Telnet or SSH? When we begin a career in industrial automation, we basically just dive in right where we have the opportunity.
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