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CHAPTER 5: SERIAL PORT, HOST DEVICE AND USER CONFIG
FIGURE 5-6. PUTTY CONFIGURATION SCREEN
NOTE: PuTTY supports Telnet (and SSH). Enter the console server’s IP address as the Host Name (or IP address). Select Telnet as
the protocol and set the TCP port to 2000 plus the physical serial port number (that is a port between 2001 and 2048). Click
the Open button. You may receive a Security Alert that the host’s key is not cached: choose yes to continue. The login prompt
of the remote system connected to the serial port chosen on the console server will now present. You can login as normal and
use the host serial console screen.
Putty can be downloaded from http://putty.org/.
NOTE: In Console Server mode, when you connect to a serial port you connect via pmshell. To generate a BREAK on the serial port
type the character sequence ~b. If you’re doing this over OpenSSH type ~~b.
Enable or disable SSH access.
We recommend that you use SSH as the protocol where the User or Administrator connects to the console server (or connects
through the console server to the attached serial consoles) over the Internet or any other public network. This will provide
authenticated SSH communications between the SSH client program on the remote user’s computer and the console server, so the
user’s communication with the serial device attached to the console server is secure.
For SSH access to the consoles on devices attached to the console server serial ports, you can use SDT Connector. You configure
SDT Connector with the console server as a gateway, then as a host, and you enable SSH service on Port 3000 + serial port #. (That is
ports 3001 – 3048). See Chapter 7 for more information on using SDT Connector for SSH access to devices that are attached to the
console server serial ports.
Also you can use common communications packages, like PuTTY or SSHTerm to SSH connect directly to port address IP
Address:Port 3000 + serial port #. (That is ports 3001 – 3048).
Alternately, SSH connections can be configured using the standard SSH port 22. The serial port being accessed is then identified by
appending a descriptor to the username. This syntax supports any of the following descriptors:
<username>:<portXX>
<username>:<port-label>
<username>:<ttySX>
<username>:<serial>