10. Telnet & SSH Functions
10.1. Network Port Numbers
Whenever an inbound Telnet or SSH session connects to an RSM-8R4 serial port,
the Port Status Screen and Port Diagnostics Screen will indicate that the serial 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, "N11".) This "Nn"
number is referred to as the logical Network Port Number.
10.2. SSH Encryption
In addition to standard Telnet protocol, the RSM-8R4 also supports SSH connections,
which provide secure, encrypted access via network. In order to communicate with the
RSM-8R4 using SSH protocol, your network node must include an appropriate SSH
Note that when the /K (Send SSH Key) command is invoked, the RSM-8R4 can also
provide you with a public SSH key, which can be used to streamline connection to the
RSM-8R4 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-8R4, and once this key is supplied to the
SSH client, the client will no longer display a warning indicating that the RSM-8R4 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:
1. SSH1
For example, to obtain the public SSH key for an SSH2 RSA client, type
/K 2 and then press [Enter].
Note: Although the RSM-8R4 does not support SSH1, the /K 1 command will
still return a key for SSH1.
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