Administrator Guide

Version Description
7.6.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series.
6.1.1.0 Introduced on the E-Series.
Usage
Information
This command specifies the maximum number of attempts to authenticate a user on an SSH connection
with the remote host for password authentication. SSH disconnects when the number of password
failures exceeds authentication-retries.
ip ssh challenge–response–authentication
Enable challenge response authentication for SSHv2.
Syntax
ip ssh challenge-response-authentication enable
To disable the challenge response authentication, use the no ip ssh challenge-response-
authentication enable command.
Parameters
enable Enter the keyword enable to enable the challenge response authentication for
SSHv2.
Defaults Disabled.
Command Modes CONFIGURATION
Command
History
This guide is platform-specific. For command information about other platforms, see the relevant Dell
Networking OS Command Line Reference Guide.
Version Description
9.11(0.0) Introduced on the S4810, S4820T, S3048–ON, S3100 Series, S4048–ON, S5000,
S6000, S6000–ON, Z9500, Z9100–ON, S6100–ON, S6010–ON, S4048T–ON,
C9000, and MXL.
Usage
Information
If both the challenge response authentication and password authentication methods are configured, the
challenge response authentication takes priority.
NOTE:
SSHv1 does not support challenge response authentication.
ip ssh cipher
Configure the list of ciphers supported on both SSH client and SCP.
Syntax
ip ssh cipher cipher-list
Parameters
cipher cipher-list Enter the keyword cipher and then a space-delimited list of ciphers that the SSH
client supports. The following ciphers are available.
● aes256-ctr
● aes256-cbc
● aes192-ctr
● aes192-cbc
● aes128-ctr
● aes128-cbc
● 3des-cbc
Defaults The default list of ciphers is in the order as shown below:
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