108
Advanced Operations
-48 VDC Remote Power Manager
Installation and Operations Manual
SSH
Secure Shell (SSH) version 2 enables secure network terminal sessions between a Remote Power Manager and a
remote user over insecure network. SSH provides an encrypted terminal sessions with strong authentication of both the
server and client, using public-key cryptography and is typically used as a replacement for unencrypted Telnet. In
addition to enabling secure network terminal sessions to the unit for configuration and power management, the SSH
session can be used for secure Pass-Thru connections to attached devices.
SSH requires the configuration and use of a client agent on the client PC. There are many freeware, shareware or for-
purchase SSH clients available. Two examples are the freeware client PuTTY and the for-purchase client
SecureCRT
by VanDyke
Software. For configuration and use of these clients, refer to the applicable software
documentation.
SSH Command Summary
Command
Description
Set SSH
Enables/disables SSH support
Set SSH Port
Sets the SSH server port number
Enabling and Setting up SSH Support
NOTE:
A restart of the unit is required after setting or changing
any
SSH configurations.
Enabling or disabling SSH support:
The Set SSH command enables or disables SSH support.
To enable or disable SSH support:
At the Switched -48 VDC: prompt, type
set ssh
, followed by
enabled
or
disabled
and press
Enter
.
Changing the SSH server port:
With SSH support enabled, the SSH server watches and responds to requests on the default SSH port number 22. This
port number can be changed using the Set SSH Port command.
To change the SSH port:
At the Switched -48 VDC: prompt, type
set ssh port
, followed by the port number and press
Enter
.
Example
The following changes the SSH port number to 65535:
Switched -48 VDC: set ssh port 65535<Enter>
SSH Technical Specifications
Secure Shell (SSH) version 2
Asymmetric Cryptography:
Diffie-Hellman DSA/DSS 512-1024 (random) bits per NIST specification
Symmetric Cryptography:
AES256-CBC
RIJNDAEL256-CBC
3DES-192-CBC
AES192-CBC
RIJNDAEL192-CBC
BLOWFISH-128-CBC
AES128-CBC
RIJNDAEL128-CBC
ARCFOUR-128
Message Integrity:
HMAC-SHA1-160
HMAC-SHA1-96
HMAC-MD5-128
HMAC-MD5-96
Authentication:
Username/Password
Session Channel Break Extension (for RS232 Break)