Users Guide

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 Microsoft Windows Server 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 x this issue, download hotx 824810 from support.microsoft.com. For more information, you can also see Microsoft Knowledge Base

article 824810.

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. 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). On servers that run 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 about the RACADM commands, see the Dell Chassis Management Controller for PowerEdge FX2/FX2s

RACADM Command Line Reference Guide available at dell.com/support/Manuals.

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.

SSH is enabled by default. If SSH is disabled, then you can enable it using any other supported interface.

Supported SSH cryptography schemes

To communicate with CMC using SSH protocol, it supports multiple cryptography schemes listed in the following table.

Table 22. Cryptography Schemes

Scheme Type Scheme

Asymmetric Cryptography Die-Hellman DSA/DSS 512–1024 (random) bits per NIST specication

Symmetric Cryptography

• AES256-CBC

• RIJNDAEL256-CBC

• AES192-CBC

• RIJNDAEL192-CBC

• AES128-CBC

• RIJNDAEL128-CBC

• BLOWFISH-128-CBC

• 3DES-192-CBC

124 Conguring CMC to use Command Line consoles