User guide

Icon Description
Copy Text - Copies highlighted text in a Telnet Viewer session screen to the system clipboard
Restore - Restores the ability to highlight screen text when autoscaling is enabled and the virtual
terminal window has been scaled
Paste - Pastes the contents of the system clipboard into a Telnet Viewer session
Prints a screen of Telnet Viewer session data
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 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
Explorer. The DSView 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
330 DSView™ 4 Installer/User Guide