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10-2
Telnet & SSH Functions
10.3. The Direct Connect Feature
The Direct Connect feature allows you to initiate a Telnet, SSH or Raw Socket session
with the RSM-8R4 and make an immediate connection to a specific serial port of your
choice, without first being presented with the command interface. This allows you to
connect to a TCP port that is mapped directly to one of the RSM-8R4's serial ports.
Direct Connect employs unique, pre-assigned TCP port numbers for each serial port.
The user connects to the port of choice by including the associated TCP port number in
the Telnet or SSH connect command line.
The Direct Connect feature can be individually configured at each serial port and can be
used to connect to Any-to-Any, Passive, Buffer, or Modem Mode ports.
10.3.1. Standard Telnet Protocol, SSH and Raw Socket
The Direct Connect feature allows you to establish port connections using either
Standard Telnet Protocol, SSH encryption or Raw Socket. When Standard Telnet
Protocol is used, the RSM-8R4 will respond to all IACs.
When configuring a serial port to allow Direct Connections using SSH protocol, note
that the Direct Connect option (Port Configuration Menu, Item 31), must be set to
"On - Password" as described in Section 10.3.2.
When configuring a serial port to allow Direct Connections using either Standard Telnet
or Raw Socket Mode, note that the Direct Connect option (Port Configuration Menu,
Item 31) may be set to either "On - Password" or "On - No Password".
10.3.2. Configuration
The Direct Connect Function is configured on a per port basis using the Port
Configuration Menus (/P nn), item 31, "Direct Connect". The following options are
available:
1. Direct Connect OFF: Direct Connect disabled at this port. (Default)
2. Direct Connect ON - NO PASSWORD: The Direct Connect feature is enabled at
this port, but no password is required in order to connect to the port.
a) When the Telnet connection is established, the user is immediately connected
directly to the specified port, and the client is notified at the TCP level.
b) This option is intended for situations where security is provided by the attached
device.
Note: The SSH Direct Connection function is disabled when the
"On - No Password" option is selected.
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