Default Route, IP Address Spoofing | USRobotics NETServer/8 instruction

Default Route

This command determines whether the NETServer will dynami- cally update IP default gateway information. The default is off. Use the following command:

set default <on broadcast listen off>

On	The NETServer will broadcast its default gateway
	information as part of normal RIP messaging and
	will also listen for default gateways broadcast by
	other routing devices.
Broadcast	The NETServer will broadcast its default gateway
	information as part of normal RIP messaging, but
	will not listen for default gateways.
Listen	The NETServer will listen for default gateway
	information coming from other routers. However,
	it will not broadcast such information.
Off	The NETServer neither sends default gateway
	information to other routers nor listens for default
	gateways.

Note: The NETServer will use a default route broadcast by another router only if Default Route is set to on or listen and the metric of the route received is lower than the metric of the IP Default Gateway. In such a case, the broadcast default route will override the Default Gateway setting.

IP Address Spoofing

This command configures the IP address that the NETServer reports to remote networks. This allows more than one NETServer to appear to have a single IP address. The default is 0.0.0.0 (no IP address spoofing).

set reported_ip <IP address>

10-6 Command Reference

Image 156

USRobotics NETServer/8, NETServer/16 manual Default Route, IP Address Spoofing

Contents

NETServer/8 NETServer/16 Page Table of Contents Network Dial-in Access Administrative Tools Reference Section Warranty and Service Limited Warranty Service and Support Technical SupportVii We welcome your suggestions for better documentation Viii Chapter Overview What’s New with Release 3.1?Additional Software Enhancements Overview Netmask Table IP Address SpoofingAccounting Servers Accounting Server Support Multiple Name Servers Randomized HostsRadius Accounting and ANI/DNIS Icmp Message Logging New Modem Port Features NETServer Overview IP Modem Sharing How do I get there from here? Administrative Utilities Security Chapter 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 networks Basic Installation IP Configuration You must also set the Broadcast Address. Type the following IPX Configuration Ethernet802.3 ethernet802.2 ethernet802.2II ethernetII Final Steps Recommended Global Configuration PasswordIP and IPX Default Gateways To set the IP gateway, type the following Name Service Save your work Basic Installation Chapter Configuration Overview How to Setup ApplicationsConfiguration Overview Where do I go from here? Application Section Command Line Commands are not case sensitiveYou can abbreviate commands Separate a parameter and its value by a space Reset any ports you have changed Reboot when necessaryHow to log out of the command line Save your changes Quick Command Overview Overview of configurable tables Global ConfigurationHosts Table Initialization Script Configuration Net0 LAN Port ConfigurationLocation Table Netmasks Table Packet Filter Table Port Configuration Port Type Snmp Configuration Routes Table User 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 Terminal Server Detailed Setup Configuring a PortSet the port type to User Login Set the port’s security Pass-Thru Login Create 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 Example NETServer 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 Prework Configuration 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 ports Create user table entries for the dial in users Create a user table entry for the dialback user Save 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 Routing LAN-to-LAN Routing Static vs. Dynamic Routes How RIP Dynamically Builds the Routing Table How Packets are Routed Establishing Connections to Remote Gateways Routing Procedure PAP/CHAP Authentication PAP Password Authentication Protocol Chap Setup for the NETServer Chap Challenge Example LAN-to-LAN Routing Detailed Setup Configuring the Port Creating 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 xyzabc Setting 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? Configure the port as a host device Chapter Talking to the ModemsTCP/IP Modem Sharing Assign the modem a TCP port number Save your work and reset the port Turn modem control carrier detect off Implementing Security with Host Device Dial Out Configuring modems as Unix pseudo TTYs Talking to the Modems Modem Initialization Scripts How ToAdd a New Initialization Script Assign Text to an Initialization Script Use an Existing Initialization Script Delete an Initialization ScriptDisplaying an Initialization Script Default initialization string Initialization Script Example Sending AT commands to the modems Talking to the Modems Chapter Packet Filters Packet FiltersPacket Filters Types of Filters Packet Filters and the NETServer Input filters vs. Output filters Information Sources Adding 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 UDP Filtering RIP messages FTP Packet Filtering Client opens a control channel FTP Example Filtering Icmp packets Type Description IPX packet filtering IPX Rules Dsthost SAP Rule Options Editing Packet Filters Edit a Packet FilterDelete a Packet Filter Rule Delete a Packet Filter View a Packet Filter View the Packet Filter Table Chapter Administrative Tools Configuring the !root accountChanging the command prompt Root Access Telnet Access Port Manually Connecting to a Remote Site Dial CommandNslogin, Rlogin and Telnet Commands Troubleshooting Commands Viewing Debug messages Turn off the output console by typing the following Ifconfig MTU Ping Ptrace Traceroute Version Show command Show Show arp Show flash Show memory Show netconns Show netstat Show sap Show sessions Administrative Tools Chapter Command Reference Global ConfigurationCommand Reference View the Global Configuration Table Get helpSave Changes Default Host Global user parametersAssigned Address Connect Message Randomize Hosts Default Gateways Global routing parameters Default Route IP Address Spoofing NetBIOS Packet Propagation PAP AuthenticationProxy ARP System Name Name Service ServiceServer name DNS Cache Reset Time-out Domain name Radius security Primary Radius ServerAlternate Radius Server Radius Secret Radius Accounting Syslog Accounting Icmp Logging Hosts Table Add a HostDelete a Host View the Hosts Table Bring Up the List of Commands Location TableAdd a Location to the Location Table Change a Location’s Parameters Save Location Table Changes View the Location TableView a Particular Location Location Table Parameters Connection Type IP Address NetmaskIPX Network Protocol RoutingCompression Dial Group Maximum Ports Idle Time-out High Water Mark MTU PPP Async Map Output Filter Input FilterDial Script Send Reply LAN Port Net0 Configuration Reset the Network Interface Card View LAN Port Configuration LAN Port ParametersEthernet Status Configured Ethernet Media Interface Address Broadcast Address IPX Frame Type Set net0 ifilter filter name Netmask Table Add a netmaskDelete a netmask View the netmask table Save Port Configuration Change a Port’s Parameters To view all of the S-ports, use the following command View the Ports Table Idle 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 Login User Login Port Parameters Dialback DelayAutolog Name Host Login Service Terminal Type Hardwired Port Parameters IPX Network Number Set s0 netmask netmask NETServer sends RIP information across Serial Communications Parameters Port SpeedDatabits Stopbits Parity Flow ControlHost Override Modem Control Routes 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 Parameter IP Parameters IPX Parameters Snmp Table Delete Snmp HostsSave the Snmp Table Changes Enabling/Disabling Snmp Snmp Table Parameters View Snmp TableRead Community Name Write Community Name Read Hosts Write Hosts User Table Add a User to the User Table Change a User’s Parameters Delete a UserSave User Table Changes View the User Table Login User Parameters Access FilterDialback Number Set user name service rlogin telnet netdata portmux Command Reference Network User Parameters Dialback IPX 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 Hardware Power Requirements Maximum Output PowerMaximum Input Power Typical Input Power Technical Specifications A-3 External Serial Port Console Ethernet Network Interface Card 10Base-T Signal Technical Specifications A-510Base-2 BNC Isolated GND Technical Specifications Token Ring⎯STP Connector Technical Specifications A-7Token Ring Network Interface Card Token Ring⎯UTP Connector NETServer Firmware Specifications AdministrationTechnical Specifications A-9 Routing Support PPP Specific Features Industry Standards SupportClient Dial-up Support Technical Specifications A-11 Slip and PPP Client Software Support Technical Specifications Appendix B Addressing Schemes IPX Addressing BasicsIP Addressing Basics Addressing Schemes B-1 Address Classes SubnettingAddressing Schemes Mask Binary Subnets Hosts Addressing Schemes B-3 Reserved Addresses Supernetting Advanced TCP/IP Addressing Schemes B-5 Cidr 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 SDL Using a Direct Connection to a PC Why Perform an SDL Software Download?Appendix C Software Download Software Download C-1 Make Backup Copies of the NETServer Firmware Software InstallationLoading the Software Download SDL Program Starting SDL SDL Command Syntax Software Download C-3 Optional -d Parameter Filename Prefixes Entering SDL Mode Software Download C-5 From the Windows Management Software Upgrading NETServer Firmware Upgrading the Modem Firmware Software Download C-7 For the Isdn NETServer, the file names are Error Messages Software Download C-9 PC 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-1 Boot Process Using Syslog Appendix E Syslog AccountingSyslog Accounting E-1 Syslog System Messages Spotting Unused PortsSyslog System Message Format Syslog Accounting Syslog System Message Examples Syslog Accounting E-3 Someone has logged in as !root on port S16 Syslog Accounting E-5 Syslog Accounting Appendix F Obtaining Radius Security a Centrally Managed User Table Setting Up Radius User Table Entries Authentication Items Response 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 Acct-Delay-Time Radius AccountingRadius accounting fields Acct-Status-Type Accounting Examples Acct-AuthenticAcct-Session-Time Radius Alphabetical Index Index Index Icmp MTU NIC PPP SAP Slip Index Index