Users Guide

Version Description
7.5.1.0 Introduced on the C-Series.
pre-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
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