SynOptics 3395 Programming manual

Software Management Guide
for the Model 3395/3395A
Terminal Server
Supplement 5.2
SynOptics Communications, Inc.
4401 Great America Parkway
Santa Clara, CA 95052-8185
[phone]
893-763-A July 1994

ii 893-763-A
© 1994 by SynOptics Communications, Inc. All rights reserved.
Trademarks
SynOptics, SynOptics Communications, and LattisNet are registered trademarks of SynOptics
Communications, Inc. Lattis System 3000 and SynOptics Press are trademarks of SynOptics
Communications, Inc.
Other brand and product names are registered trademarks or trademarks of their respective holders.
Statement of Conditions
In the interest of improving internal design, operational function, and/or reliability, SynOptics
Communications, Inc. reserves the right to make changes to the products described in this document
without notice.
SynOptics Communications, Inc. does not assume any liability that may occur due to the use or
application of the product(s) or circuit layout(s) described herein.
Federal Communications Commission (FCC) Statement
Note: This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against
harmful interference when the equipment is operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy. If it is not installed and used in accordance with the
instruction manual, it may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference, in which case users will be required to
take whatever measures may be necessary to correct the interference at their own expense.
Electromagnetic Emissions
Meets requirements of
FCC Part 15, Subparts A and B, Class A
En 55 022 (CISPR 22:1985), Class A
General License VDE 0871, Class B (AmtsblVfg No. 243/1991 and Vfg 46/1992)
VCCI Class 1 ITE
This supplement contains new pages and replacement pages for the Software Management Guide for the
Model 3395/3395A Terminal Server, 893-158-C. Follow these instructions to add and replace pages in this
manual: Replacement Pages
The following new pages: Replace these existing pages:
i through xiii i through xi
Chapter 5 Chapter 5
index-1 through index-6 index-1 through index-6
Addendum Pages
Add these pages: Following this page:
Chapter 20 Setting Up SecurID 19-9
Chapter 21 Setting Up ARAP 20-4

Software Management Guide
for the Model 3395/3395A
Terminal Server
Version 5.2
SynOptics Communications, Inc.
4401 Great America Parkway
Santa Clara, CA 95052-8185
[phone]
893-763-A July 1994

ii 893-763-A
© 1994 by SynOptics Communications, Inc. All rights reserved.
Trademarks
SynOptics, SynOptics Communications, and LattisNet are registered trademarks of SynOptics
Communications, Inc. Lattis System 3000 and SynOptics Press are trademarks of SynOptics
Communications, Inc.
Other brand and product names are registered trademarks or trademarks of their respective holders.
Statement of Conditions
In the interest of improving internal design, operational function, and/or reliability, SynOptics
Communications, Inc. reserves the right to make changes to the products described in this document
without notice.
SynOptics Communications, Inc. does not assume any liability that may occur due to the use or
application of the product(s) or circuit layout(s) described herein.
Federal Communications Commission (FCC) Statement
Note: This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against
harmful interference when the equipment is operated in a commercial environment. This equipment
generates, uses, and can radiate radio frequency energy. If it is not installed and used in accordance with the
instruction manual, it may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference, in which case users will be required to
take whatever measures may be necessary to correct the interference at their own expense.
Electromagnetic Emissions
Meets requirements of
FCC Part 15, Subparts A and B, Class A
En 55 022 (CISPR 22:1985), Class A
General License VDE 0871, Class B (AmtsblVfg No. 243/1991 and Vfg 46/1992)
VCCI Class 1 ITE

893-763-A iii
Table of Contents
Preface
Conventions xvi
Ordering SynOptics Publications..............................................................................................xvii
SynOptics Customer Support..................................................................................................xvii
Chapter 1 - Introducing the Model 3395 Terminal Server
Obtaining Operating Software and Parameters.............................................................................1-2
Compatibility Issues..............................................................................................................1-2
Terminal Server Software Management Tools.............................................................................1-3
Software Management Tools .............................................................................................1-3
Standard DEC Software Installation and Management Tools ....................................................1-3
Chapter 2 - Setting Up the Terminal Server
Setting Up the Terminal Server................................................................................................2-1
Changing Operational Parameters.......................................................................................2-2
Assigning Basic Internet Characteristics.....................................................................................2-2
Assigning an Internet Address and Subnet Mask....................................................................2-2
Configuring Domain Name Server Support..........................................................................2-2
Related Commands and Server Characteristics.......................................................................2-3
Selecting Protocols and Features ..............................................................................................2-5
Chapter 3 - Setting Up Terminal Devices
Basic Procedures....................................................................................................................3-1
Preparing the Host for Local Access Connections........................................................................3-2
LAT Services .................................................................................................................3-2
TCP/IP Connections........................................................................................................3-2
Preparing Specific Types of Terminal and Ports ..........................................................................3-4
Setting Up Standard Terminals...........................................................................................3-4
Using Personal Computers as Terminals..............................................................................3-5
Setting Up Hard Copy (Printing) Terminals .........................................................................3-5
Setting Up Dedicated Services............................................................................................3-5
Setting Up Multisessions Terminals...................................................................................3-6
Using the Menu Feature ...................................................................................................3-6

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Chapter 4 - Setting Up Printers
How to Set Up Shared Printers ................................................................................................4-2
Setting Up a UNIX Shared Printer Service .................................................................................4-3
Installing the Shared Printer Output Filter............................................................................4-3
Defining a Printer to the UNIX Printer Subsystem ................................................................4-5
Operating the Shared Printer..............................................................................................4-6
Error Conditions .............................................................................................................4-6
Restrictions....................................................................................................................4-8
UNIX Shared Printer Protocol Description ...........................................................................4-8
Setting Up a UNIX PostScript Printer Service............................................................................4-10
Setting Up a VMS/Ultrix Printer Service...................................................................................4-12
VMS Hosts....................................................................................................................4-13
Ultrix Hosts...................................................................................................................4-14
Setting Up Services and Queues for Remote Access Connections ...................................................4-15
The Server Connection Queue............................................................................................4-16
Chapter 5 - Setting Up Modems
Setting Up Dial-In Modems ....................................................................................................5-1
Setting Up Dial-Back Modems.................................................................................................5-3
Using Dial-Back Scripts on the Terminal Server....................................................................5-3
Configuring PORT Characteristics .....................................................................................5-4
Setting Up a Dial-Back Script Server ..................................................................................5-5
Script File Structure and Guidelines....................................................................................5-7
Setting Up a Dial-Out Modem.................................................................................................5-9
Basic Procedure...............................................................................................................5-9
Configuring a LAT Application Port at a VMS Host.............................................................5-11
Modem Control Operation ......................................................................................................5-12
Device Types..................................................................................................................5-12
Supported Modem Control Signals.....................................................................................5-13
Information About Model 3395 Cabling Methods..................................................................5-13
Modem-Related PORT Characteristics.................................................................................5-14
Server Modem Disconnect Sequence....................................................................................5-16
Modem Control Signal Interaction......................................................................................5-17
Using Signal Check...............................................................................................................5-26
Flow Control .......................................................................................................................5-27
Software Flow Control.....................................................................................................5-27
Hardware Flow Control ....................................................................................................5-28
Chapter 6 - Setting Up TN3270 Terminals
Enabling the TN3720 Protocol ................................................................................................6-1
Enabling Extended Attributes.............................................................................................6-2
Defining TN3270 Devices.......................................................................................................6-2
Creating a New Device Type .............................................................................................6-3
Defining a TN3270 Terminal Type.....................................................................................6-3
Defining the TN3278 Type ...............................................................................................6-4
Modifying the Keymap.....................................................................................................6-4
Modifying the Screenmap .................................................................................................6-5
Assigning a TN3270 Device to a Port.................................................................................6-9
Other Commands That Affect TN3270 Devices.....................................................................6-11
Defining TN3270 Translation Tables ........................................................................................6-11
Creating a New Translation Table.......................................................................................6-12
Entering New Values Into the Table....................................................................................6-13
Assigning a Translation Table to a Port...............................................................................6-15
Other Commands that Affect Translation Tables....................................................................6-16

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Local Printer Support.............................................................................................................6-17
Chapter 7 - Using TCP/IP Features
Configuring Internet Routes....................................................................................................7-1
Dynamic Routing ...........................................................................................................7-1
Static Routing................................................................................................................7-2
Related Commands and Terminal Server Characteristics..........................................................7-2
Configuring Rotary Connections..............................................................................................7-3
Rotary Configuration Procedure .........................................................................................7-4
Domain Name Storage .....................................................................................................7-5
Associated Commands......................................................................................................7-5
Configuring RLOGIN Support ................................................................................................7-6
Associated Commands......................................................................................................7-7
Remote Network Management Support .....................................................................................7-7
Using SNMP .................................................................................................................7-7
Associated Commands......................................................................................................7-9
Using Telnet to Gain Access to Remote Console Ports ..........................................................7-10
Associated Commands......................................................................................................7-11
Loading With Internet Protocols...............................................................................................7-11
Loading Images and Parameter Files....................................................................................7-13
Configuring Protocols on Servers with NVR........................................................................7-13
Directed TFTP Request.....................................................................................................7-14
Merit Value of Responses.................................................................................................7-14
Filenames in NVR ..........................................................................................................7-14
Eliminating TFTP Broadcasts............................................................................................7-14
Saving Parameters in the Permanent Database.......................................................................7-15
Dump Transmission ........................................................................................................7-15
Associated Commands......................................................................................................7-16
Using the Terminal Server as a Domain Name Server...................................................................7-16
Associated Commands......................................................................................................7-17
Configuring the Terminal Server to Use SLIP ............................................................................7-18
Terminal Server and Port Configuration...............................................................................7-18
SLIP Sessions................................................................................................................7-20
Associated Commands......................................................................................................7-20
Using IP Reassembly.............................................................................................................7-21
Associated Commands......................................................................................................7-21
Using TCP Resequencing .......................................................................................................7-21
Associated Commands......................................................................................................7-23
Chapter 8 - Managing Terminal Server Resources
How the Terminal Server Allocates Memory ..............................................................................8-1
Strategies for Managing Memory .............................................................................................8-2
Select Only Features and Protocols Necessary at Your Site......................................................8-2
Alter Operating Parameters for the Enabled Features or Protocols .............................................8-5
Use a Terminal Server With More Memory..........................................................................8-5
Accept Less Than Optimal Performance or Less Functionality.................................................8-6
Parameters that Directly Affect Memory Allocation .....................................................................8-6
Identifying Memory Problems ...........................................................................................8-7
Adjusting Parameters .......................................................................................................8-8
Server Node Limit...........................................................................................................8-8
Server Queue Limit .........................................................................................................8-9
Server Session Limit .......................................................................................................8-9
Server Service Groups......................................................................................................8-9
Server Textpool Size........................................................................................................8-9
Server Packet Buffers .......................................................................................................8-10

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Parameter Server Limit.....................................................................................................8-10
Port Typeahead Size.........................................................................................................8-10
Port Internet TCP Window Size.........................................................................................8-11
Helpful Displays...................................................................................................................8-11
The SHOW|MONITOR SERVER COUNTERS Display........................................................8-11
The SHOW|MONITOR SERVER STATUS Display.............................................................8-11
The SHOW|MONITOR SERVER ALTERNATE STATUS Display.........................................8-13
Chapter 9 - Using Terminal Server Security Features
Controlling Access to the Terminal Server.................................................................................9-1
Terminal Server Passwords................................................................................................9-1
Privilege Levels..............................................................................................................9-3
The Kerberos Security System...........................................................................................9-4
Controlling Access to Resources on the Network ........................................................................9-8
The Port Access Characteristic...........................................................................................9-8
Limited View Protection for Network Resources ...................................................................9-8
Authorized LAT Service Groups.........................................................................................9-9
Password Protection for LAT Services.................................................................................9-9
Using the Internet Security Table .......................................................................................9-9
Default Values for the Internet Security Table.......................................................................9-11
Using Scripts to Enhance Network Security ...............................................................................9-16
Dedicated Services ...........................................................................................................9-16
Dial-back Modem Scripts..................................................................................................9-17

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Chapter 10 - Using the Accounting Feature
Enabling the Accounting Feature on the Terminal Server..............................................................10-1
Enabling the syslogd Daemon..................................................................................................10-2
About Information in the Account Log......................................................................................10-2
Enabling the Verbose Account Log —The Default Account Log ..............................................10-4
Specifying a Verbose Priority Number and Log File Location..................................................10-4
Clearing the Account Log.................................................................................................10-5
Commands Associated With the Accounting Feature....................................................................10-6
Chapter 11 - Using Scripts
How the Script Feature Works.................................................................................................11-1
Setting Up the Script Servers ..................................................................................................11-2
Developing a Script File...................................................................................................11-4
Directory Requirements ....................................................................................................11-5
Setting Up the Terminal Server to Use Scripts............................................................................11-6
Associated Commands......................................................................................................11-7
Script File Execution and Processing ..................................................................................11-7
Examples of Scripts...............................................................................................................11-9
Chapter 12 - Model 3395 Support for the Xremote Protocol
Terminal Server Support for Xremote Features............................................................................12-1
Starting Up the XDM Host.....................................................................................................12-3
Configuring the Terminal Server for Xremote Support.................................................................12-5
Enabling the Xremote Protocol on the Terminal Server ..........................................................12-5
Defining Remote Font Servers...........................................................................................12-5
TFTP Security on Font Servers .........................................................................................12-7
Defining Xremote Characteristics at Terminal Server Ports......................................................12-8
Establishing an Xremote Session .......................................................................................12-9
Using a Script to Configure the Terminal Server for Xremote Support......................................12-12
Enhancing Security for Xremote Users ................................................................................12-14
Notes on Memory Requirements for Xremote .............................................................................12-15
How Xremote Can Affect Terminal Server Performance..........................................................12-15
Memory Requirements for Sessions and Windows .................................................................12-15
Notes and Restrictions......................................................................................................12-16
Chapter 13 - Model 3395 Support for the Point-to-Point Protocol
About the Point-to-Point Protocol............................................................................................13-1
Enabling PPP on the Terminal Server.......................................................................................13-3
Setting Up Terminal Server Ports to Support PPP ......................................................................13-4
Specifying Optional PPP Port Characteristics.......................................................................13-5
Configuring a PPP Port for Modem Support........................................................................13-6
Assigning Local and Remote PPP Addresses to PPP Ports......................................................13-6

viii 893-763-A
Examples of Single-Node Configurations...................................................................................13-7
A PC With an Internet Address Within the LAN Subnet.........................................................13-8
A PC With an Internet Address Outside of the LAN Subnet.....................................................13-9
A PC With No Configured Internet Address..........................................................................13-11
Example of a Two-Node Configuration......................................................................................13-13
Chapter 14 - Configuring Print Services for Novell Users
Using Model 3395 Commands to Configure Novell Printing.........................................................14-2
Configuring a Port to Support Novell Printing.....................................................................14-2
Viewing Available Novell Printer Servers............................................................................14-3
Viewing Status of Xprinter Ports .......................................................................................14-3
Terminating Xprinter Operations........................................................................................14-3
Viewing IPX Protocol Packet Type Setting..........................................................................14-4
Novell Server Configuration....................................................................................................14-5
Adding a New NetWare Print Server....................................................................................14-7
Changing an Existing NetWare Print Server.........................................................................14-15
Chapter 15 - Managing Initialization Records
Viewing Initialization Parameters.............................................................................................15-1
Enabling and Disabling Protocols.............................................................................................15-2
Model 3395 Terminal Servers............................................................................................15-2
Changing Protocols from the Command Interface..................................................................15-2
Using the CARD, NVS, LattisNet, and MOP Protocols.........................................................15-3
Using the BOOTP and RARP Protocols..............................................................................15-4
Using the DTFTP Protocol...............................................................................................15-4
Resetting Initialization Parameters to Default Values ...................................................................15-5
Chapter 16 - Setting Up Server Daemons
Enabling Daemons at the Server...............................................................................................16-2
Using the Finger Daemon (fingerd)...........................................................................................16-2
Using the Route Daemon (routd)..............................................................................................16-6
Using the Rwho Daemon (rwhod).............................................................................................16-7
Chapter 17 - Setting Printers Using the lpd Daemon
Setting Up lpd Shared Printers.................................................................................................17-1
Enable the lpd Daemon at the Terminal Server......................................................................17-1
Set Port Characteristics to Support Shared Printer Connections................................................17-2
Setting up queues for lpd
Setting up Berkeley (BSD) UNIX lpd printers
Configuring the lpd Printer at the UNIX Host.......................................................................17-3
Setting up AT&T System V UNIX lpd printers ....................................................................17-6
Setting up AIX lpd printer ................................................................................................17-7
Operating and Managing the lpd Printer and Print Queue...............................................................17-9