Users Guide

Configuring the SSH Server Cipher List
To configure the cipher list supported by the SSH server, use the ip ssh server cipher cipher-list command in CONFIGURATION
mode.
cipher-list-: Enter a space-delimited list of ciphers the SSH server will support.
The following ciphers are available.
• 3des-cbc
• aes128-cbc
• aes192-cbc
• aes256-cbc
• aes128-ctr
• aes192-ctr
• aes256-ctr
The default cipher list is aes256-ctr, aes256-cbc, aes192-ctr, aes192-cbc, aes128-ctr, aes128-cbc, 3des-cbc.
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 enabled by default using the SSH Password Authentication method.
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
Dell(conf)#ip ssh password-authentication enable
Dell# show ip ssh
SSH server : enabled.
SSH server version : v1 and v2.
SSH server vrf : default.
SSH server ciphers : 3des-cbc,aes128-cbc,aes192-cbc,aes256-cbc,aes128-ctr,aes192-
ctr,aes256-ctr.
SSH server macs : hmac-md5,hmac-md5-96,hmac-sha1,hmac-sha1-96,hmac-sha2-256,hmac-
sha2-256-96.
SSH server kex algorithms : diffie-hellman-group-exchange-sha1,diffie-hellman-group1-
sha1,diffie-hellman-group14-sha1.
Password Authentication : enabled.
Hostbased Authentication : disabled.
RSA Authentication : disabled.
Vty Encryption HMAC Remote IP
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.
Security
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