Tripp Lite B093-004-2E4U-V Owner's Manual

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4. Serial Port, Host, Device and User Conﬁguration

Or, by typing username=fred:serial and ssh port = 22, the User is presented with a port selection option:

This syntax enables Users to set up SSH tunnels to all serial ports with only a single IP port 22 having to be opened in

their ﬁrewall/gateway

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 connecting over OpenSSH, type ~~b.

TCP RAW TCP allows connections directly to a TCP socket. However, while communications programs like

PuTTY also supports RAW TCP, this protocol would usually be used by a custom application.

For RAW TCP, the default port address is IP Address _ Port (4000 + serial port #) i.e. 4001 – 4048.

RAW TCP also enables the serial port to be tunneled to a remote console server, so two serial port

devices can be transparently interconnect over a network (refer to section 4.1.6 Serial Bridging).

RFC2217 Selecting RFC2217 enables serial port redirection on that port. For RFC2217, the default port

address is IP Address _ Port (5000 + serial port #) i.e. 5001 – 5048.

RFC2217 also enables the serial port to be tunneled to a remote console server, so two serial port

devices can be transparently interconnect over a network (refer to section 4.1.6 Serial Bridging).

Unauthenticated Telnet Selecting Unauthenticated Telnet enables telnet access to the serial port without authentication

credentials. When a user accesses the console server to telnet to a serial port, they are normally

provided a login prompt. However, with unauthenticated telnet, they connect directly to the port

without any console server login restrictions (if a telnet client does prompt for authentication, any

entered data will allow connection).

This mode is mainly used when you have an external system (such as conserver) to manage user

authentication and access privileges at the serial device level.

NB: only the connection to the console server is unauthenticated. Logging into a device connected

to the console server may still require authentication.

For Unauthenticated telnet, the default port address is IP Address _ Port (6000 + serial port #)

i.e. 6001 – 6048.

Unauthenticated SSH Selecting Unauthenticated SSH enables SSH access to the serial port without authentication

credentials. When a user accesses the console server to telnet to a serial port, they are normally

provided a login prompt. However, with unauthenticated SSH, they connect directly to the port

without any console server login challenge (if a SSH client does prompt for authentication, any

entered data will allow connection).

This mode is primarily used when you have another system managing user authentication and

access privileges at the serial device level, but still wish to encrypt the session across the network.

NB: only the connection to the console server is unauthenticated. Logging into a device connected

to the console server may still require authentication.

For Unauthenticated telnet, the default port address is IP Address _ Port (7000 + serial port #)

i.e. 7001 – 7048.

Note: The <username>: method of port access (as described in the above SSH section) always requires

authentication.

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Tripp Lite B093-004-2E4U-V 4-Port Console Server with 4G LTE Cellular Gateway, Dual GbE NIC, 4Gb Flash and Dual SIM