In order to create a more secure environment, we need to enable SSH version 2 using the following: Let’s enable and configure SSH on Cisco router or switch using the below packet tracer lab. %SSH-5-ENABLED: SSH 1.99 has been enabled To configure SSH on Cisco router, you need to do: Enable SSH on Cisco router. You should see a message similar to the below: % Generating 2048 bit RSA keys, keys will be non-exportable…ĭepending on the bit size, the above command may take a few moments to complete. To configure it, we will use ip ssh version 2 command. The second one provide more enhanced security agorithm. There are two SSH versions, SSH version 1 and SSH version 2. After that, we will configure the the version of SSH. Choosing a key modulus greater than 512 may take With this command, we can use local router users to ssh access. The name for the keys will be: Ĭhoose the size of the key modulus in the range of 360 to 4096 for your Authentication timeout: 60 secs Authentication. Lab-switch(config)# crypto key generate rsa SSH Disabled - version 2.0 Please create RSA keys to enable SSH.
#Cisco enable ssh v2 free
If you would like to read more on Cisco cryptography, feel free to read Cisco’s Next Generation Cryptography article. After you run the below command, you will be prompted to specify how many bits you would like to use for the algorithm. For more information about configuring SSH on your router, check out Cisco's Configuring Secure Shell documentation and its Secure Shell Version 2 Support documentation. SSH Configuration Examples in Cisco (IOS,IOS-XE,NX-OS,IOS-XR) Here are the configuration examples: whereas: 192.168.100.100 Jumphost. Next we’ll need to generate the RSA keypair, it is generally recommended to use a 2048 bit key for SSH v2.
Lab-switch(config)# ip domain-name lab.local Since we’ll be using an RSA keypair for encryption, we need to set the hostname and domain of the router. For security reasons, we’re going to enable SSH version 2 instead of version 1 or the more vulnerable telnet protocol.įor those that are unfamiliar, SSH (Secure Shell) is a secure network protocol used for remote access connections with authentication and encryption.įor this article, I’ll be using my Cisco 3560CG 8 port switch using Cisco IOS 15.0(2), though these steps are largely unchanged on different Cisco IOS versions.
#Cisco enable ssh v2 how to
If you’re new to the world of Cisco IOS devices, you may be wondering how to enable remote access instead of using the local console cable to configure your device.
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