Reference Guide

● aes192-ctr
● aes256-ctr
The default cipher list is 3des-cbc,aes128-cbc,aes192-cbc,aes256-cbc,aes128-ctr,aes192-ctr,aes256-ctr
Example of Configuring a Cipher List
The following example shows you how to configure a cipher list.
Dell(conf)#ip ssh server cipher 3des-cbc aes128-cbc aes128-ctr
Secure Shell Authentication
Secure Shell (SSH) is disabled by default.
Enable SSH using the ip ssh server enable command.
SSH supports three methods of authentication:
● Enabling SSH Authentication by Password
● Using RSA Authentication of SSH
● Configuring Host-Based SSH Authentication
Important Points to Remember
● If you enable more than one method, the order in which the methods are preferred is based on the ssh_config file on the
Unix machine.
● When you enable all the three authentication methods, password authentication is the backup method when the RSA
method fails.
● The files known_hosts and known_hosts2 are generated when a user tries to SSH using version 1 or version 2, respectively.
Enabling SSH Authentication by Password
Authenticate an SSH client by prompting for a password when attempting to connect to the Dell Networking system. This setup
is the simplest method of authentication and uses SSH version 1.
To enable SSH password authentication, use the following command.
● Enable SSH password authentication.
CONFIGURATION mode
ip ssh password-authentication enable
To view your SSH configuration, use the show ip ssh command from EXEC Privilege mode.
Dell(conf)#ip ssh server enable
% Please wait while SSH Daemon initializes ... done.
Dell(conf)#ip ssh password-authentication enable
Dell#sh ip ssh
SSH server : enabled.
Password Authentication : enabled.
Hostbased Authentication : disabled.
RSA Authentication : disabled.
Using RSA Authentication of SSH
The following procedure authenticates an SSH client based on an RSA key using RSA authentication. This method uses SSH
version 2.
1. On the SSH client (Unix machine), generate an RSA key, as shown in the following example.
2. Copy the public key id_rsa.pub to the Dell Networking system.
3. Disable password authentication if enabled.
680
Security