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Netopia R3100 manual Understanding Netopia NAT Behavior F-7

Models: R3100

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Understanding Netopia NAT Behavior F-7

IP Profile Parameters

Remote IP Address:	127.0.0.2
Remote IP Mask:	255.255.255.0
Address Translation Enabled:	Yes
Filter Set...
Remove Filter Set
Receive RIP:	No

Enter the remote IP network's IP address (form xxx.xxx.xxx.xxx decimal).

Configure IP requirements for a remote network connection here.

Toggling Address Translation Enabled to Yes enables the Netopia R3100 to send out an all-zeros IPCP address that requests an IP to be assigned to the Netopia R3100’s WAN interface. Note that the remote IP address is 127.0.0.2, which should also be the Default Gateway under IP Setup in System Conﬁguration. This is done for proﬁle matching purposes and because the IP address of the router the Netopia R3100 is dialing is not always known.

As mentioned earlier in this appendix, NAT works well for IP sessions originated on the Netopia R3100’s LAN interface destined for the Internet without any additional conﬁguration. For incoming IP connections from the Internet to a host on the Netopia R3100’s LAN interface, Exported Services need to be used.

Exported Services are conﬁgured under IP Setup in System Conﬁguration. This is where a particular type of TCP or UDP service originating from the Internet is redirected to a host on the Netopia R3100’s LAN interface. An example of this screen is as follows:

Image 273

Netopia R3100 manual Understanding Netopia NAT Behavior F-7

Contents

Netopia R3100 Isdn Routers Part Number Contents Ii User’s Reference Guide Part II Advanced Configuration Iv User’s Reference Guide Aurp Vi User’s Reference Guide Part III Appendixes Viii User’s Reference Guide Contents User’s Reference Guide Conﬁguration options for your Netopia R3100 Isdn Router Small Ofﬁce connection to the Internet Small Ofﬁce connection to the Internet Direct Connection to a Corporate Ofﬁce Telecommuter Conﬁgured to accept incoming dial-up connections Conﬁgured for Idsl Part I Getting Started User’s Reference Guide Chapter Introduction Features and capabilitiesOverview IntroductionHow to use this guide Find a location Chapter Making the Physical ConnectionsWhat you need Making the Physical ConnectionsIdentify the connectors and attach the cables Netopia R3100 Isdn Router Back Panel Ports Cable to your router on Services on Netopia R3100 LED front panel Netopia R3100 Isdn Router Status LightsSetting up your Router with the SmartStart Wizard Chapter Setting up your Router with the SmartStart WizardBefore running SmartStart SmartStart Wizard conﬁguration screens Setting up your Router with the SmartStart WizardEasy option Easy or Advanced setupSetting up your Router with the SmartStart Wizard User’s Reference Guide Setting up your Router with the SmartStart Wizard User’s Reference Guide Advanced option Connection Proﬁle screen on Conﬁguration tab Dynamic conﬁguration recommendedStatic conﬁguration optional Add. Repeat this process for the secondary DNS TCP/IP Conﬁguring TCP/IP on Macintosh computersTCP/IP or MacTCP Dynamic conﬁguration using MacIP optional Setting up your Router with the SmartStart Wizard User’s Reference Guide Connecting Your Local Area Network Chapter Connecting Your Local Area NetworkReadying computers on your local network 10Base-T Connecting to an Ethernet network10BASE-T Remote console Connecting to a LocalTalk network Wiring guidelines for PhoneNET cabling User’s Reference Guide Chapter SmartView SmartView overviewSmartView General Machine information Navigating SmartViewEvent history pages Connection ProﬁlesDevice Event History WAN Event History Standard Html web-based monitoring pages User’s Reference Guide Chapter Console-based Management About Console-based ManagementConsole-based Management Connecting through a Telnet session Conﬁguring Telnet software Connecting a local terminal console cable to your routerPC ANSI-BBS Navigating through the console screens User’s Reference Guide Easy Setup console screens Chapter Easy SetupHow to access the Easy Setup console screens Easy SetupSee Appendix A, Troubleshooting, for more suggestions Isdn Easy Setup Beginning Easy SetupPPP Cancel Idsl Easy Setup Previous Screen Easy Setup ProﬁleUser’s Reference Guide Previous Screen Next Screen IP Easy SetupEasy Setup Security Conﬁguring Frame Relay Isdn Easy Setup Frame Relay screensWAN Conﬁguration Frame Relay screens Setup Isdn Line ConfigurationFrame Relay conﬁguration Easy Setup Frame Relay Dlci conﬁguration Displaying a Frame Relay Dlci conﬁguration table Changing a Frame Relay Dlci conﬁguration Adding a Frame Relay Dlci conﬁguration ADD Dlci NOW CancelDeleting a Frame Relay Dlci conﬁguration Part II Advanced Configuration User’s Reference Guide Chapter WAN and System Configuration Creating a new Connection ProﬁleWAN and System Conﬁguration Add Connection Proﬁle screen appears IPX Profile Parameters Remote IPX Network BAP Telco Options Initiate Data Service 64 kb/sec Dial Default Proﬁle How the default proﬁle works Configuration Default Profile Customizing the Default ProﬁleIP parameters default proﬁle screen WAN and System Conﬁguration Auxiliary Port Conﬁguration IPX parameters default proﬁle screenSystem Conﬁguration screens System Conﬁguration features PAP Filter Sets Firewalls Network Protocols SetupIP Address Serving Date and TimeMM/DD/YY Console Conﬁguration Upgrade Feature SetSnmp Simple Network Management Protocol SecurityLogging Telephone setupNov Chapter Using SmartPhone for Telephone Services Using SmartPhone for Telephone ServicesSpecifying telephone connections Inbound Directory Number Using SmartPhone for Telephone Services Preview Ring Deﬁning priority ringingLine provisioning Advanced calling featuresConﬁguring supplementary services Chapter Call Accounting and Default Answer Profile Cost control feature -- call accountingCall Accounting and Default Answer Proﬁle Viewing call accounting statistics Call Accounting Statistics screen appears Scheduled connections Viewing scheduled connections Adding a scheduled connection Set Weekly Schedule Set Once-Only Schedule How the Default Answer Proﬁle works Default Answer ProﬁleModifying a scheduled connection Deleting a scheduled connectionCustomizing the default proﬁle Call Accounting and Default Answer Proﬁle Call acceptance scenarios Chapter IP Setup and Network Address Translation Network Address Translation featuresIP Setup and Network Address Translation HOW NAT Works Using Network Address Translation ISP Using multiple Connection Proﬁles Associating port numbers to nodesNetwork Address Translation guidelines IP setup IP Setup and Network Address Translation Select Add Export. The Add Exported Service screen appears IP Setup IP subnets IP Setup and Network Address Translation Static routes Viewing static routes Adding a static route Rules of static route installation Modifying a static routeDeleting a static route Main System IP Address Menu Configuration Serving 163.176.56.90 Dhcp NetBIOS Options MacIP Kip Forwarding Options You have ﬁnished your IP Setup IPX Features Chapter IPX SetupIPX Setup IPX DeﬁnitionsIPX address Service Advertising Protocol SAPSocket Routing Information Protocol RIPNetBIOS IPX setupIPX Spooﬁng Default Gateway Address IPX routing tables User’s Reference Guide Chapter AppleTalk Setup Installing AppleTalkAppleTalk Setup AppleTalk protocol AppleTalk networksAppleTalk Setup Aurp MacIPRouters and seeding Conﬁguring AppleTalk EtherTalk Setup LocalTalk Setup Aurp setup Viewing Aurp partnersAurp Free Trade Zone Modifying an Aurp partner Adding an Aurp partnerDeleting an Aurp partner Receiving Aurp connectionsConﬁguring Aurp Options User’s Reference Guide Chapter Monitoring Tools Quick View status overviewMonitoring Tools General status Status lights Current statusGeneral Statistics Statistics & LogsEvent histories Physical InterfaceNetwork Interface Request from our DN WAN Event HistoryDevice Event History Routing tablesIP routing table IPX routing table IPX Sap Bindery tableAppleTalk routing table Served IP Addresses IP Address Lease Management screen appears Snmp System InformationCommunity strings Snmp Setup screenSnmp traps Viewing IP trap receivers Setting the IP trap receiversModifying IP trap receivers Deleting IP trap receiversUser’s Reference Guide Chapter Security Suggested security measuresSecurity User accounts Protecting the Security Options screenProtecting the conﬁguration screens Dial-in Console Access Telnet access Enable SmartStart/SmartView/Web ServerAbout ﬁlters and ﬁlter sets What’s a ﬁlter and what’s a ﬁlter set?Filter priority How ﬁlter sets workPacket First filter Match? Yes ﬁlter’s actions How individual ﬁlters workﬁltering rule Parts of a ﬁlterPort number comparisons Port numbersPutting the parts together Other ﬁlter attributesFiltering example #1 UDPFiltering example #2 Design guidelinesAn approach to using ﬁlters Working with IP ﬁlters and ﬁlter setsDisadvantages of ﬁlters Adding a ﬁlter set Input and output ﬁlters-source and destination Naming a new ﬁlter setAdding ﬁlters to a ﬁlter set Netopia R-series RouterADD this Filter NOW Cancel Viewing ﬁlters Viewing ﬁlter setsModifying ﬁlters Deleting ﬁltersModifying ﬁlter sets Deleting a ﬁlter setSample IP ﬁlter set TCP Icmp UDP Possible modiﬁcations Security IPX ﬁlters IPX packet ﬁlters Viewing and modifying packet ﬁltersAdding a packet ﬁlter Deleting a packet ﬁlter IPX packet ﬁlter setsViewing and modifying packet ﬁlter sets Adding a packet ﬁlter setADD Filter SET NOW Cancel IPX SAP ﬁlters Deleting a packet ﬁlter setViewing and modifying SAP ﬁlters Adding a SAP ﬁlter Deleting a SAP ﬁlter IPX SAP ﬁlter setsViewing and modifying SAP ﬁlter sets Adding a SAP ﬁlter setDeleting a SAP ﬁlter set Firewall tutorial General Firewall Terms Basic IP Packet ComponentsBasic Protocol Types Firewall design rules Example TCP/UDP PortsFirewall Logic Binary Representation Logical ANDingImplied Rules Filter Basics Established ConnectionsExample IP Filter Set Screen Example Filters Example NetworkExample Example Example Using the SecurID token card Token Security AuthenticationKey Security Authentication Features of the Netopia R3100 Securing network environmentsConﬁguring for security authentication Security authentication componentsEstablishing a dial-on-demand DOD connection call Connecting using security authenticationCurrent Connection Status Establishing a manual connection call User’s Reference Guide Utilities and Diagnostics Chapter Utilities and DiagnosticsStart Ping PingUtilities and Diagnostics Stop Ping Telnet clientTelnet client screen appears Trace RouteSecure Authentication Monitor Factory defaults Disconnect Telnet Console SessionTransferring conﬁguration and ﬁrmware ﬁles with Tftp Updating ﬁrmware Uploading conﬁguration ﬁles Downloading conﬁguration ﬁlesTransferring conﬁguration and ﬁrmware ﬁles with Xmodem Do you want to send a saved configuration to your Netopia? Restarting the system Isdn Switch Loopback Test User’s Reference Guide If the loopback test fails Part III Appendixes User’s Reference Guide Appendix a Troubleshooting Conﬁguration problemsTroubleshooting A-1 SmartStart Troubleshooting Console connection problemsNetwork problems How to get support Power outagesTechnical support Before contacting NetopiaFAX-Back Online product informationFinding an Isdn service provider Appendix B Setting Up Telco ServicesObtaining an Isdn line Choosing an Isdn lineSetup tips Physical Isdn lineIsdn Ordering Codes Outside North America only Switch protocol typeDirectory and Spid numbers U models only Circuit ID number U models onlyLong-distance Isdn calls North American models only Testing the Isdn lineCompleting the Isdn worksheet Isdn Telco Worksheet for North America Isdn Telco Worksheet for Outside North America User’s Reference Guide North American Telco Provisioning for Isdn Appendix C North American Telco Provisioning for IsdnUser’s Reference Guide Finding an Internet service provider Appendix D Setting Up Internet ServicesSetting Up Internet Services D-1 Unique requirementsPricing and support Setting up a Netopia R3100 accountISP’s Point of presence Endorsements Deciding on an ISP accountLocal LAN IP address information to obtain Obtaining information from the ISPWith Network Address Translation Remote WAN IP address information to obtainRemote WAN IP address information to obtain Appendix E Understanding IP Addressing What is IP?About IP addressing Understanding IP Addressing E-1Subnets and subnet masks Example Using subnets on a Class C IP internet Understanding IP Addressing E-3Subnet masks ISP Network Network conﬁgurationDistributing IP addresses Example Working with a Class C subnetUnderstanding IP Addressing E-5 BackgroundTechnical note on subnet masking Conﬁguration Netopia R3100 Dhcp Server CharacteristicsUnderstanding IP Addressing E-7 Dhcp Address ServingManually distributing IP addresses Using address servingTips and rules for distributing IP addresses MacIP ServingDhcp example Understanding IP Addressing E-9Internet Nested IP subnetsUnderstanding IP Addressing E-11 Packet header types BroadcastsNetwork Conﬁguration Appendix F Understanding Netopia NAT BehaviorBackground Understanding Netopia NAT Behavior F-1User’s Reference Guide Understanding Netopia NAT Behavior F-3 Router NetopiaRouter Netopia Understanding Netopia NAT Behavior F-5 Exported servicesImportant notes Understanding Netopia NAT Behavior F-7 Summary Appendix G Understanding Frame Relay Virtual CircuitsUnderstanding Frame Relay G-1 Committed Information Rate CIR Committed Burst Size BcExcess Burst Size Be Local and Global DLCIs AddressingLocal Management Interface LMI Understanding Frame Relay G-3Encapsulation and Fragmentation Network Protocol Addressing and Virtual InterfacesFrame Relay partial mesh support Understanding Frame Relay G-5 User’s Reference Guide Leased line events Appendix H Event HistoriesIsdn events Event HistoriesIsdn event cause codes Event Histories User’s Reference Guide Event Histories User’s Reference Guide Deﬁnitions Appendix Isdn Conﬁguration GuideAbout SPIDs Isdn Conﬁguration GuideDynamic B-channel usage Example SPIDsOther incoming call restrictions User’s Reference Guide Binary Conversion Table J-1 Appendix J Binary Conversion TableDecimal Binary Further Reading K-1 Appendix K Further ReadingUser’s Reference Guide Further Reading K-3 User’s Reference Guide Appendix L Technical Specifications and Safety Information Technical Speciﬁcations and Safety Information L-1Pinouts for Auxiliary Port Modem Cable DSR Technical Speciﬁcations and Safety Information L-3 Power requirementsDescription EnvironmentRegulatory notices Agency approvalsNorth America InternationalTechnical Speciﬁcations and Safety Information L-5 Important safety instructions Australian Safety InformationDeclaration for Canadian users Technical Speciﬁcations and Safety Information L-7 Telecommunication installation cautionsBattery User’s Reference Guide Glossary GlossaryUser’s Reference Guide Glossary User’s Reference Guide Glossary Remapping See network number remapping Glossary User’s Reference Guide Index-1 IndexIndex-2 ISP Index-3NAT Index-4Spid Index-5Index-6 Limited Warranty and Limitation of Remedies Limited Warranty and Limitation of RemediesUser’s Reference Guide