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For a
User
named “fred” to access serial port 2, when setting up the SSHTerm or the PuTTY
SSH client, instead of typing
username
=
fred
and
ssh port
=
3002
, the alternate is to type
username
=
fred:port02 (
or
username
=
fred:ttyS1)
and
ssh port
=
22.
Or, by typing
username=fred:serial
and
ssh port = 22.
A port selection option appears to the
User
:
This syntax enables
Users
to set up SSH tunnels to all serial ports with only opening a single IP
port 22 in their firewall/gateway.
TCP
RAW TCP allows connections directly to a TCP socket. Communications programs like
PuTTY
also support RAW TCP. You would usually access this protocol via 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 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 #), that is
,
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 were connected to the local serial port (see
Chapter 4.6—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 4.1.6—Serial
Bridging
).
Unauthenticated Telnet
Selecting
Unauthenticated Telnet
enables telnet access to the serial port
without requiring the user to provide credentials. When a user accesses the
console server
to
telnet to a serial port he normally is given a login prompt. With unauthenticated telnet, the
user connects directly through to a port with any
console server
login. This mode is mainly
used when you have an external system (such as
conserver
) managing user authentication
and access privileges at the serial device level.
For Unauthenticated Telnet, the default port address is IP Address _ Port (6000 + serial port
#) i.e. 6001 – 6048
