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SSH(Secure socket Layer/shell) Secure Shell Server version 2
In a previous lesson, I explained how you can use telnet for remote access to your Cisco IOS devices. The problem with telnet is that everything is sent in plaintext, for that reason you shouldn’t use it. SSH (Secure Shell) is a secure method for remote access as is includes authentication and encryption. To do this, it uses a RSA public/private keypair.
There are two versions: version 1 and 2. Version 2 is more secure and commonly used.
Last but not least, to configure SSH you require an IOS image that supports crypto features. Otherwise you won’t be able to configure SSH
Configuration the SSH version 2
R1(config)#ip domain-name NETWORKLESSONS.LOCAL
R1(config)#crypto key generate rsa
The name for the keys will be: R1.NETWORKLESSONS.LOCAL
Choose the size of the key modulus in the range of 360 to 4096 for your
General Purpose Keys. Choosing a key modulus greater than 512 may take a few minutes.
How many bits in the modulus : 2048
% Generating 2048 bit RSA keys, keys will be non-exportable…
[OK] (elapsed time was 3 seconds)
When you use the crypto key generate rsa command, it will ask you how many bits you want to use for the key size. How much should you pick?
It’s best to check the next generation encryption article from Cisco for this. At this moment, a key size of 2048 bits is acceptable. Key sizes of 1024 or smaller should be avoided. Larger key sizes also take longer to calculate.
Once the keypair has been generated, the following message will appear:
%SSH-5-ENABLED: SSH 1.99 has been enabled
As you can see above, SSH version 1 is the default version. Let’s switch to version 2:
R1(config)#ip ssh version 2
SSH is enabled but we also have to configure the VTY lines:
R1(config)#line vty 0 4
R1(config-line)#transport input ssh
This ensures that we only want to use SSH (not telnet or anything else) and that we want to check the local database for usernames. Let’s create a user:
R1(config)#username admin password my_password