8. Telnet & SSH Functions
8.1. Network Port Numbers
Whenever an inbound Telnet or SSH session connects to an RSM RS232
Port, the Port Status Screen and Port Diagnostics Screen will indicate that the
RS232 port is presently connected to Port "Nn" (where "N" indicates a network
connection, and "n" is a number that lists the logical Network Port being used;
for example, "N7".) This "Nn" number is referred to as the logical Network
8.2. SSH Encryption
In addition to standard Telnet protocol, the RSM also supports SSH
connections, which provide secure, encrypted access via network. In order
to communicate with the RSM using SSH protocol, your network node must
include an appropriate SSH client.
Note that when the /K (Send SSH Key) command is invoked, the RSM can
also provide you with a public SSH key, which can be used to streamline
connection to the RSM when using SSH protocol.
Although you can establish an SSH connection to the unit without the public
key, the public key provides validation for the RSM, and once this key
is supplied to the SSH client, the client will no longer display a warning
indicating that the RSM is not a recognized user when the client attempts to
establish a connection.
The /K command uses the following format:
/K <k> [Enter]
Where k is an argument that determines which type of public key will be
displayed, and the k argument offers the following options:
2. SSH2 RSA
3. SSH2 DSA
For example, to obtain the public SSH key for an SSH2 RSA client, type
/K 2 and then press [Enter].
Note: Although the RSM does not support SSH1, the /K 1 command
will still return a key for SSH1.