Users Guide

Table Of Contents
Using Telnet Console With CMC
You can have up to four Telnet sessions with CMC at a time.
If your management station is running Microsoft Windows XP or Windows 2003, you may experience an issue with the
characters in a CMC Telnet session. This issue may occur as a frozen login where the return key does not respond and the
password prompt does not appear.
To fix this issue, download hotfix 824810 from support.microsoft.com. You can also see the Microsoft Knowledge Base article
824810 for more information.
In the command line interface, you can manage session timeouts using the racadm command, racadm getconfig -g
cfgSessionManagement. For more information, see the Chassis Management Controller for Dell PowerEdge M1000e
RACADM Command Line Reference Guide.
Using SSH With CMC
SSH is a command line session that includes the same capabilities as a Telnet session, but with session negotiation and
encryption to improve security. The CMC supports SSH version 2 with password authentication. SSH is enabled on the CMC by
default.
NOTE: CMC does not support SSH version 1.
When an error occurs during the CMC login, the SSH client issues an error message. The message text is dependent on the
client and is not controlled by CMC. Review the RACLog messages to determine the cause of the failure.
NOTE:
OpenSSH must be run from a VT100 or ANSI terminal emulator on Windows. You can also run OpenSSH using
Putty.exe. Running OpenSSH at the Windows command prompt does not provide full functionality (that is, some keys do
not respond and no graphics are displayed). For systems running Linux, run SSH client services to connect to CMC with any
shell.
Four simultaneous SSH sessions are supported at a time. The session timeout is controlled by the
cfgSsnMgtSshIdleTimeout property. For more information, see the database property chapter of the Chassis
Management Controller for Dell PowerEdge M1000e RACADM Command Line Reference Guide, the Services Management
page in the Web interface, or see Configuring Services.
CMC also supports Public Key Authentication (PKA) over SSH. This authentication method improves SSH scripting automation
by removing the need to embed or prompt for user ID/password. For more information, see Configure Public Key Authentication
over SSH.
SSH is enabled by default. If SSH is disabled, then you can enable it using any other supported interface.
To configure SSH, see Configuring Services.
Related concepts
Configuring Services on page 79
Supported SSH Cryptography Schemes
To communicate with CMC using SSH protocol, it supports multiple cryptography schemes listed in the following table.
Table 33. Cryptography Schemes
Scheme Type Scheme
Asymmetric Cryptography Diffie-Hellman DSA/DSS 5121024 (random) bits per NIST
specification
Symmetric Cryptography
AES256-CBC
RIJNDAEL256-CBC
AES192-CBC
RIJNDAEL192-CBC
152 Configuring CMC to Use Command Line Consoles