Avocent SPC420 manual Security Property, Opening a Session, To open a Telnet Viewer session

290DSView 3 Software Installer/User Guide

Security Property

A fully functional SSH2 (Secure Shell Version 2) Client is built into the Telnet Viewer. The SSH2 Client is Java-based and provides a secure method for accessing target devices.

The Telnet Viewer provides the following security features:

•Strict host key checking

•Support ciphers for AES (128-, 192-, 256-bit), Blowfish, Twofish, Cast, 3DES and Arcfour

•Diffie-Hellman key exchange support

•SSH-RSA key types

•Supported for hmac-md5, hmac-sha1, hmac-sha1-96, hmac-md5-96 and hmac-ripemd160

The DSView 3 software will determine whether to create a Telnet or SSH2 connection when you start a session with an appliance. A serial connection provides SSH2 serial access to the target device from the appliance. Terminal emulation options are supported using both types of connections.

The SSH2 client is started when you initiate a session with an appliance port from the DSView 3 Explorer. The DSView 3 server is contacted, which in turn contacts the target device connected to the appliance port and exchanges X.509 certificates with the target device. The target device also supplies a session certificate, private key and appliance certificate.

These certificates are then passed back to the SSH2 client, which uses them to determine the SSH2 host key and the user SSH2 key. The Telnet Viewer will then establish a session with the target device (or through the proxy server if there is a proxy server connection). The Telnet Viewer then passes the RSA public key from the session certificate when establishing the SSH connection. Finally, the virtual terminal window will open using an SSH2 shell over SSH connection.

SSH2 settings may be viewed by clicking on an appliance name in the DSView 3 Explorer and selecting Appliance Settings - Sessions - Settings in the side navigation bar to display the Properties - Sessions - Settings window.

Opening a Session

A DSView 3 management software Telnet Viewer session is opened using the DSView 3 Explorer by clicking on Telnet Session or Serial Session in the Action column of the target device. If the target device is attached to an appliance port, Telnet Session will appear. If the target device is attached to an appliance that is also attached to a serial device, Serial Session will appear.

NOTE: If multiple connection methods are available, an alternate actions arrow will appear to the right of the action. Clicking the alternate action arrow will display a list of other actions, in descending order of priority, which may be selected to launch the corresponding window type.

To open a Telnet Viewer session:

In a Units View window containing target devices (see Accessing Units View windows on

page 106), click Telnet Session or Serial Session in the Action field or the Alternate Action menu.