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TN server enables TN3270 clients to communicate with a host
through an intermediate SNAplus2 node that implements the TN server.
The TN3270 clients connect to the TN server using TCP/IP, and use
LUs defined on the TN server. The TN server LUs establish sessions
with LUs at the host to support TN3270 sessions for the clients. Before you can configure TN server, you must perform the following
configuration tasks: To configure TN server, perform the following tasks: Configure a TN server access record
for each TN3270 client who will use the server, or a default record
that enables any client to access the server (see “Configuring TN Server Access Records”). If you are supporting TN3270E or TN3287 clients,
you can define an association record for display and printer LUs
(see “Configuring TN Server
Association Records”).
This record enables a TN3270E or TN3287 client to select a specific
printer (by selecting the associated display LU). The client must
be authorized to select an LU in the TN server access record.
Advanced options for TN server enable you to force printer
responses and specify a keep-alive method for all TN3270 sessions. Configuring TN Server Access Records | |
TN server access records indicate which TN3270 clients can
access the TN server and which LUs they should use. Each access
record identifies a TN3270 client that is permitted to access the
TN server, the TCP/IP port that the client connects to, and the
LU or LU pool that the client uses. You can also define default
records that enable access by any TN3270 client. If you want to permit any TN3270 client to use the TN server
and you want all TN3270 clients to use the same LUs or LU pools,
you can define a default record. TN3270 clients can use the TN server only when the node, port,
and link station are active. To configure a TN server access record, use one of the following
methods: - Motif
administration program
Select TN
server from the Services
menu on the Node window, and TN server from the submenu. On
the resulting window, select the TN Server Client Access Permissions
pane and choose New. - Command-line administration program
Issue the following command: define_tn3270_access
TN Server Access Record Configuration
ParametersThe following parameters are required for TN server access
record configuration: - TN3270 client address
The address that identifies the TN3270 client to
which the access record applies: - Default record
Permit access by any TN3270 client. - TCP/IP
name or alias
Permit access by a named TN3270 client. If you know
the TCP/IP name of the client, select this option and enter the
name. On many computers, you can find out the computer's TCP/IP
name using the hostname command. - TCP/IP
address
Permit access from a specific TCP/IP address. If
you know the TCP/IP address of the TN3270 client, select this option
and enter the address in the standard TCP/IP dotted decimal address
format.
- Support TN3270E
The level of TN3270 support provided by the node: - TN3270
Support only the TN3270 protocol. Selecting this
option disables server support for TN3270E protocols, even if they
are supported on the client. - TN3270E
Support both TN3270 and TN3270E protocols (the default).
TN3270 and TN3287 protocols are always supported, regardless
of which option you choose. - TCP/IP port number
The TCP/IP port number (on the TN server) for the
port to which the TN3270 client connects. | | | |  | NOTE: TCP/IP ports are completely unrelated to SNA ports. | | | | |
The well-known port number for the TN3270 service is 23, but use of this port number
is likely to clash with the HP-UX system TELNET service. SNAplus2
includes a utility to enable this port to be shared between the
telnet and TN3270 daemons;
that utility must be installed for both to work. For details about
this utility, refer to the information for the define_tn3270_access
command in HP-UX SNAplus2 Administration Command Reference. If you choose a different port number that is not in use on
the TN server, you also need to configure that port number on the
TN3270 clients (or start the TN3270 clients using an option to specify
the port number). Port numbers above 2000
are likely to be available. Port numbers in the range 256-1023
may give slightly better security, but are more likely to be in
use. If you want a TN3270 client to be able to use more than one
LU or LU pool, define multiple access records, each with a different
TCP/IP port number, so that you can identify the different LUs or
LU pools by specifying different port numbers. - Display LU assigned
The name of the LU that the TN3270 client accesses
when it is active. The LU must be a dependent LU on the local node.
You can specify the name of an LU pool rather than the name of a
particular LU. - Printer LU assigned
The name of the default printer LU or LU pool for
clients that use this access record. This LU must be defined as
a dependent LU on the local node. - Allow access to specific LU
Specify this option to enable TN3270E and TN3287
clients to request a specific LU for a session. (This option is
not available to TN3270 clients.)
After performing the TN server access configuration, continue
with the following configuration tasks: Configuring TN Server
Association Records | |
A TN server association record defines an association between
a printer LU and display LU, so that the TN3270E or TN3287 protocol
can connect the two. If the access record for the client permits
selection of a specific LU, this record enables a client to select
a specific printer by specifying the associated display LU. To configure a TN server association record, use one of the
following methods: - Motif
administration program
Select TN
Server from the Services
menu on the Node window, then select the Association Records pane
on the TN Server window and choose New. - Command-line administration program
Issue the following command: define_tn3270_association
TN Server Association
Record Configuration ParametersThe following parameters are required for TN server association
record configuration: - Display LU
The name of the display LU (which must be defined
on the local node). - Printer LU
The name of the printer LU (which must be defined
on the local node). Do not specify a printer LU that has been entered
on another TN server association record.
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