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Chapter 3: Serial Port, Device and User Configuration

For a user named chris to access serial port 2, when setting up the SSHTerm or the PuTTY

SSH client, instead of typing username = chris and ssh port = 3002, the alternate is to type

username = chris:port02 (or username = chris:ttyS1) and ssh port = 22.

Or by typing username=chris: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 a single IP port 22

having to be opened in their firewall/gateway

NOTE In console server mode, you connect to a serial port via pmshell. To generate a BREAK on the

serial port, type the character sequence ~b. If you’re doing this over OpenSSH, type ~~b.

TCP RAW TCP allows connections to a TCP socket. While communications programs like PuTTY

also support RAW TCP, this protocol is usually 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 transparently interconnect over a network (see Chapter 3.1.6 – 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

Special client software is available for Windows UNIX and Linux that supports RFC2217 virtual

com ports, so a remote host can monitor and manage remote serially attached devices as

though they are connected to the local serial port (see Chapter 3.6 – Serial Port Redirection for

details)

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

port devices can transparently interconnect over a network (see Chapter 3.1.6 – Serial

Bridging)

Unauthenticated Telnet This 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 given a login

prompt. With unauthenticated Telnet, they connect directly through to the port without any

console server login challenge. If a Telnet client does prompt for authentication, any entered

data allows connection.

Opengear CM7100 User Manual

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