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, "N11".) This "Nn" number is referred to as the logical Network Port Number.
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:
1.SSH1
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.