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USRobotics NETServer/8, NETServer/16 manual IP Terminal Server Case Studies, Example

Models: NETServer/16 NETServer/8

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IP Terminal Server Case Studies

The following examples set up users to log into the two hosts in the illustration below.

IP Terminal Server - Case Studies

Example 1

UserA, UserB, and UserC are all Login Users with entries in the user table. An application on VAX1 is connected to a dial-up information database that is open to the public (those not in the user table).

Before you begin

Make sure the NETServer is properly configured.

∙the NETServer must have an IP address assigned to it

∙the NETServer’s netmask must match the one being used on the local network.

See Minimum Configuration in Chapter 2 for instructions on how to set these parameters.

4-12 IP Terminal Server Setup

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USRobotics NETServer/8, NETServer/16 manual IP Terminal Server Case Studies, Example

Contents

NETServer/8 NETServer/16 Page Table of Contents Network Dial-in Access Administrative Tools Reference SectionWarranty and Service Limited WarrantyService and Support Technical SupportVii We welcome your suggestions for better documentation ViiiAdditional Software Enhancements Chapter OverviewWhat’s New with Release 3.1? OverviewAccounting Servers Netmask TableIP Address Spoofing Accounting Server SupportRadius Accounting and ANI/DNIS Multiple Name ServersRandomized Hosts Icmp Message LoggingNew Modem Port Features NETServer Overview IP Modem Sharing How do I get there from here? Administrative Utilities SecurityChapter Basic Installation System Administrator RequirementsBasic Installation TCP/IP Reference Material Accessing the Command Line Getting Started Getting the LAN port up and running First step for IPX or IP/IPX networksBasic Installation IP Configuration You must also set the Broadcast Address. Type the following IPX Configuration Ethernet802.3 ethernet802.2 ethernet802.2II ethernetIIFinal Steps Recommended Global Configuration PasswordIP and IPX Default Gateways To set the IP gateway, type the following Name Service Save your workBasic Installation Chapter Configuration Overview How to Setup ApplicationsConfiguration Overview Where do I go from here? Application SectionYou can abbreviate commands Command LineCommands are not case sensitive Separate a parameter and its value by a spaceHow to log out of the command line Reset any ports you have changedReboot when necessary Save your changesQuick Command Overview Overview of configurable tables Global ConfigurationHosts Table Location Table Initialization Script ConfigurationNet0 LAN Port Configuration Netmasks TablePacket Filter Table Port Configuration Port TypeSnmp Configuration Routes TableUser Table Configuration Overview Chapter IP Terminal Server Setup Terminal or Workstation SetupIP Terminal Server Setup NETServer Terminal Server Setup Overview Port Default Global DefaultUser Table Set the port type to User Login Terminal Server Detailed SetupConfiguring a Port Set the port’s security Pass-Thru LoginCreate default user settings for the port Port Default Login Service Optional Friendly Stuff Save sport # Configure the user Adding a Remote User to the User TableAdd the user to the User Table Login Service Configure for dialback use? IP Terminal Server Case Studies ExampleNETServer will use ports 6, 7, and 8 for this application Save your work and reset all the ports Example IP Terminal Server Setup Chapter Network Dial In Access Dial-in User SetupNetwork Dial In Access NETServer Setup for Network Dial-In Overview PreworkConfiguration NETServer Dial-In Detailed Setup Dialback Users on this Port? Save the changes to flash memory Create a new user Normal or dialback user?Add configuration information for the user This is the user’s IP subnet mask. Use the following command Option can be any one of the following IP Remote Access Case Study Configure the portsCreate user table entries for the dial in users Create a user table entry for the dialback userSave your work and reset the ports Connecting to the NETServer IPX Remote Access Create User Table entries for the dial in users Setup for NETServer Routing Overview Chapter LAN-to-LAN RoutingLAN-to-LAN Routing IPX routing LAN-to-LAN Routing An Introduction to NETServer Routing NETServer RoutingLAN-to-LAN Routing Static vs. Dynamic Routes How RIP Dynamically Builds the Routing TableHow Packets are Routed Establishing Connections to Remote GatewaysRouting Procedure PAP/CHAP Authentication PAP Password Authentication ProtocolChap Setup for the NETServer Chap Challenge Example LAN-to-LAN Routing Detailed Setup Configuring the PortCreating a Dial-Out Group Adding a Remote Device to the Location Table Create a new location table entrySet Required Location Parameters This is the remote device’s IP address Set location location name netmask netmask Dial Group Number Multiple lines for a single connection Maximum Ports Create a Dial Script Set location Chicago script 1 atds slot#\r Connect Adding the Remote Device to the User Table Create a User Table EntryTell the NETServer about the Remote Device Set user user name protocol ppp slip Set netuser user name compression on off LAN-to-LAN Routing Case Study Setting Up NETServer a Add netuser nsb password xyzabcSetting Up NETServer B Now, save your work and reset the ports Testing the Connection Connecting to NETServer a from NETServer B What If I Don’t Want to Use Chap Authentication?TCP/IP Modem Sharing Configure the port as a host deviceChapter Talking to the Modems Assign the modem a TCP port numberSave your work and reset the port Turn modem control carrier detect offImplementing Security with Host Device Dial Out Configuring modems as Unix pseudo TTYs Talking to the Modems Add a New Initialization Script Modem Initialization ScriptsHow To Assign Text to an Initialization ScriptUse an Existing Initialization Script Delete an Initialization ScriptDisplaying an Initialization Script Default initialization string Initialization Script ExampleSending AT commands to the modems Talking to the Modems Chapter Packet Filters Packet FiltersPacket Filters Types of Filters Packet Filters and the NETServerInput filters vs. Output filters Information SourcesAdding Packet Filters Input filters vs. Output filters Filter Rule Format Rule TypeName Rule Number Permit or DenyOptions TCP/IP packet filtering Destination Address TCP and UDP parameters Standard Port Numbers TCP UDPFiltering RIP messages FTP Packet FilteringClient opens a control channel FTP Example Filtering Icmp packets Type DescriptionIPX packet filtering IPX RulesDsthost SAP Rule Options Delete a Packet Filter Rule Editing Packet FiltersEdit a Packet Filter Delete a Packet FilterView a Packet Filter View the Packet Filter TableChanging the command prompt Chapter Administrative ToolsConfiguring the !root account Root AccessTelnet Access Port Manually Connecting to a Remote Site Dial CommandNslogin, Rlogin and Telnet Commands Troubleshooting Commands Viewing Debug messagesTurn off the output console by typing the following Ifconfig MTU Ping Ptrace Traceroute VersionShow command ShowShow arp Show flashShow memory Show netconnsShow netstat Show sap Show sessionsAdministrative Tools Chapter Command Reference Global ConfigurationCommand Reference View the Global Configuration Table Get helpSave Changes Assigned Address Default HostGlobal user parameters Connect MessageRandomize Hosts Default Gateways Global routing parametersDefault Route IP Address SpoofingProxy ARP NetBIOS Packet PropagationPAP Authentication System NameName Service ServiceServer name DNS Cache Reset Time-out Domain nameAlternate Radius Server Radius securityPrimary Radius Server Radius SecretRadius Accounting Syslog AccountingIcmp Logging Delete a Host Hosts TableAdd a Host View the Hosts TableAdd a Location to the Location Table Bring Up the List of CommandsLocation Table Change a Location’s ParametersSave Location Table Changes View the Location TableView a Particular Location Location Table Parameters Connection TypeIP Address NetmaskIPX Network Protocol RoutingCompression Dial Group Maximum PortsIdle Time-out High Water MarkMTU PPP Async MapOutput Filter Input FilterDial Script Send Reply LAN Port Net0 Configuration Reset the Network Interface CardView LAN Port Configuration LAN Port ParametersEthernet Status Configured Ethernet Media Interface AddressBroadcast Address IPX Frame Type Set net0 ifilter filter name Delete a netmask Netmask TableAdd a netmask View the netmask tableSave Port Configuration Change a Port’s ParametersTo view all of the S-ports, use the following command View the Ports TableIdle Port is idle View an Individual Port User Login Determining a Port’s TypeHost Device Device Service Network Login Message Dial In Port ParametersLine Hangup Login Prompt Security Pass-Thru LoginUser Login Port Parameters Dialback DelayAutolog Name Host Login Service Terminal Type Hardwired Port Parameters IPX Network NumberSet s0 netmask netmask NETServer sends RIP information across Databits Serial Communications ParametersPort Speed StopbitsHost Override ParityFlow Control Modem ControlRoutes Table Configuration Add a Route to the Routes TableChange a Route’s Information Delete a Routes Table Entry Save Routes Table ChangesView the IP Routes Table Viewing the IPX Routes Table Flag ParameterIP Parameters IPX Parameters Save the Snmp Table Changes Snmp TableDelete Snmp Hosts Enabling/Disabling SnmpRead Community Name Snmp Table ParametersView Snmp Table Write Community NameRead Hosts Write HostsUser Table Add a User to the User TableSave User Table Changes Change a User’s ParametersDelete a User View the User TableLogin User Parameters Access FilterDialback Number Set user name service rlogin telnet netdata portmux Command Reference Network User Parameters DialbackIPX connections require the PPP protocol NETServer sends RIP information to the dial Set user filter name ofilter filter name Command Reference Appendix a Technical Specifications 16 port NETServer HardwareMaximum Input Power Power RequirementsMaximum Output Power Typical Input PowerTechnical Specifications A-3 External Serial Port ConsoleEthernet Network Interface Card 10Base-T10Base-2 BNC SignalTechnical Specifications A-5 Isolated GNDTechnical Specifications Token Ring⎯STP Connector Technical Specifications A-7Token Ring Network Interface Card Token Ring⎯UTP Connector Technical Specifications A-9 NETServer Firmware SpecificationsAdministration Routing SupportPPP Specific Features Industry Standards SupportClient Dial-up Support Technical Specifications A-11 Slip and PPP Client Software SupportTechnical Specifications IP Addressing Basics Appendix B Addressing SchemesIPX Addressing Basics Addressing Schemes B-1Address Classes SubnettingAddressing Schemes Mask Binary Subnets Hosts Addressing Schemes B-3Reserved Addresses Supernetting Advanced TCP/IP Addressing Schemes B-5Cidr Each Supernet is treated as a single entity Addressing Schemes B-7 Step two Select a range of addresses for each supernet Addressing Schemes B-9 Supernetting and the NETServer Appendix C Software Download SDL Using a Direct Connection to a PCWhy Perform an SDL Software Download? Software Download C-1Loading the Software Download SDL Program Make Backup Copies of the NETServer FirmwareSoftware Installation Starting SDLSDL Command Syntax Software Download C-3Optional -d Parameter Filename PrefixesEntering SDL Mode Software Download C-5From the Windows Management Software Upgrading NETServer FirmwareUpgrading the Modem Firmware Software Download C-7For the Isdn NETServer, the file names are Error Messages Software Download C-9PC SDL program detected unknown command line argu- ments Software Download C-11 Invalid Control Word Software Download C-13 File you are trying to download is not a NETServer file Appendix D Boot Process Boot Process D-1Boot Process Using Syslog Appendix E Syslog AccountingSyslog Accounting E-1 Syslog System Message Format Syslog System MessagesSpotting Unused Ports Syslog AccountingSyslog System Message Examples Syslog Accounting E-3Someone has logged in as !root on port S16 Syslog Accounting E-5 Syslog Accounting Appendix F Obtaining RadiusSecurity a Centrally Managed User Table Setting Up Radius User Table Entries Authentication ItemsResponse Items Radius F-5 Framed-Netmask Radius F-7 User Types Radius F-9 Making NETServer talk to a Radius security server Chap authentication using Radius Radius accounting fields Acct-Delay-TimeRadius Accounting Acct-Status-TypeAccounting Examples Acct-AuthenticAcct-Session-Time Radius Alphabetical Index IndexIndex Icmp MTU NIC PPP SAP Slip Index Index