Understanding Netopia NAT Behavior C-193 | Netopia R910 specs

Understanding Netopia NAT Behavior C-193

Conﬁguration

You can toggle Address Translation Enabled to No or Yes in the WAN Ethernet Conﬁguration screen in WAN Conﬁguration under the Main Menu. An example of enabling NAT is as follows:

WAN Ethernet Configuration

Address Translation Enabled:	Yes
Local WAN IP Address:	0.0.0.0
Filter Set...
Remove Filter Set
Receive RIP:	Both

Set up the basic IP attributes of your Ethernet Module in this screen.

Toggling Address Translation Enabled to Yes enables the Netopia R910 to send out an all-zeros IPCP address that requests an IP to be assigned to the Netopia R910’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 R910 is dialing is not always known.

As mentioned earlier in this appendix, NAT works well for IP sessions originated on the Netopia R910’s LAN interface destined for the Internet without any additional conﬁguration. For incoming IP connections from the Internet to a host on the Netopia R910’s LAN interface, exported services need to be used.

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Netopia R910 manual Understanding Netopia NAT Behavior C-193

Contents

Netopia R910 Ethernet Router for DSL and Cable Modems Part Number Contents Iv User’s Reference Guide Contents Snmp Contents Index Chapter Introduction Features and capabilitiesOverview How to use this guide Deciding on an ISP account Chapter Setting Up Internet ServicesDSL and cable modems Obtaining information from the ISP With Network Address Translation Local LAN IP address information to obtainWithout Network Address Translation Find a location Chapter Making the Physical Connections What you need Identify the connectors and attach the cablesLine 1 port Your router on Netopia R910 Ethernet Router back panel ports 10 12 13 14 15 16 Netopia R910 Ethernet Router status lights Network Model Chapter Connecting to Your Local Area NetworkBefore After Readying computers on your local network Connecting to Your Local Area Network Power port Console port Connecting to an Ethernet network10Base-T Netopia R910 in a 10Base-T network User’s Reference Guide Hardware and operating system requirements Chapter Configuring TCP/IP Dynamic conﬁguration recommended Conﬁguring TCP/IP on Windows 95 or Static conﬁguration optional Conﬁguring TCP/IP on a Macintosh Computer Static conﬁguration optional Dynamic conﬁguration using MacIP optional Conﬁguring TCP/IP User’s Reference Guide Chapter Console-Based Management Snmp Simple Network Management Protocol. See Snmp on Connecting through a Telnet session Conﬁguring Telnet software Connecting a console cable to your router Mac ANSI, VT-100, or VT-200 Navigating through the console screens Easy Setup console screens Chapter Easy SetupAccessing the Easy Setup console screens Screen similar to the following Main Menu appears If your ISP supports Dhcp Quick Easy Setup connection pathIf your ISP doesn’t support Dhcp Main Menu appears WAN Ethernet Conﬁguration More Easy Setup options Previous Screen Next Screen IP Easy Setup Easy Setup Security Conﬁguration User’s Reference Guide WAN conﬁguration Chapter WAN and System Configuration System conﬁguration screens Navigating through the system conﬁguration screens System conﬁguration features Filter sets ﬁrewalls IP setupIP address serving Date and time Console conﬁguration Upgrade feature setSnmp Simple Network Management Protocol Security Logging Installing the Syslog client Network Address Translation features Chapter IP Setup and Network Address Translation HOW NAT Works Using Network Address Translation To Main Menu Network Address Translation guideline Associating port numbers with nodes IP Setup Ethernet IP Address IP Setup and Network Address Translation Exports, Add Export, and Delete Export Select Add Export. The Add Exported Service screen appears Select Service. a pop-up menu of services and ports appears IP subnets IP Setup and Network Address Translation Static routes Viewing static routes Static Routes screen will appear Adding a static route Modifying a static route Rules of static route installationDeleting a static route Main Menu System Configuration IP Address Serving Dhcp NetBios Options Serve Bootp Clients IP Address Pools IP Setup and Network Address Translation Dhcp NetBIOS Options NetBios Type User’s Reference Guide Chapter Virtual Private Networks VPN Transi t In t ern etwor k Summary Configuration Add Connection Profile Pptp configurationAbout Pptp Tunnels Chap User’s Reference Guide IP Proﬁle Parameters screen appears Encryption SupportMS-CHAP V2 and strong encryption About IPsec Tunnels Configuration Add Connection Proﬁle screen appears IPsec Encryption & Authentication Options IP Profile Parameters Following section Advanced IP Profile Options VPN Default Answer Profile VPN QuickView Interoperation with other featuresQuickView Virtual Private Networks VPN Dial-Up Networking for VPN Installing Dial-Up Networking Creating a new Dial-Up Networking profile Configuring a Dial-Up Networking profile Virtual Private Networks VPN Windows 95 VPN installation Installing the VPN ClientWindows 98 VPN installation Connecting using Dial-Up Networking About Atmp Tunnels Atmp configuration Pptp Commitcancel User’s Reference Guide Local WAN IP Address 0.0 Remote IP Address Pptp example on Atmp example on Allowing VPNs through a Firewall Pptp example Change Input Filter EnabledYes ForwardYes Source IP Address Change Output Filter EnabledYes ForwardYes Source IP Address Atmp example Source Port ID Dest. Port Compare Change Output Filter EnabledYes ForwardYes Source IP Address Chapter PPP over Ethernet Setup EN WAN Module Add Connection PPP Ethernet LAN Reconfiguration Quick View Quick View status overview Chapter Monitoring Tools Status lights General status General Statistics Statistics & Logs Physical Interface Event historiesNetwork Interface Device Event History WAN Event History Routing tables Scroll Down IP routing table Served IP Addresses System Information Snmp Snmp Setup screen Community strings Snmp traps Viewing IP trap receivers Setting the IP trap receiversModifying IP trap receivers Deleting IP trap receivers User’s Reference Guide Suggested security measures Chapter SecurityUser accounts Protecting the conﬁguration screens Protecting the Security Options screen Telnet access What’s a ﬁlter and what’s a ﬁlter set? About ﬁlters and ﬁlter setsHow ﬁlter sets work Filter priority ﬁlter’s actions How individual ﬁlters workﬁltering rule Port numbers Parts of a ﬁlter161 Aurp AppleTalk 387 Who 513 Putting the parts together Other ﬁlter attributes Transmission Control Protocol Internet Control Message ProtocolUser Datagram Protocol Filtering example #1 Filtering example #2 Design guidelines Working with IP ﬁlters and ﬁlter sets An approach to using ﬁltersDisadvantages of ﬁlters Adding a ﬁlter set Naming a new ﬁlter set Netopia R910 Router Input and output ﬁlters-source and destinationAdding ﬁlters to a ﬁlter set ADD this Filter NOW Cancel Viewing ﬁlters Viewing ﬁlter setsModifying ﬁlters Deleting ﬁlters Deleting a ﬁlter set Modifying ﬁlter setsSample IP ﬁlter set TCP Icmp UDP Possible modiﬁcations User’s Reference Guide Basic IP packet components Firewall tutorial General ﬁrewall termsBasic protocol types ACK Bit Yes Example TCP/UDP Ports Firewall design rulesFirewall Logic Logical and function Binary representationImplied rules Established connections Filter basicsExample IP ﬁlter set screen This is an example of the Netopia IP ﬁlter set screen Example network Example ﬁltersExample Example Example User’s Reference Guide Radius Client Support Radius client configuration Radius Server Secret Continue Cancel Continue Chapter Utilities and Diagnostics Start Ping Ping Receive return Ping packet Stop Ping Trace Route Telnet client Disconnect Telnet console session Factory defaultsTransferring conﬁguration and ﬁrmware ﬁles with Tftp Updating ﬁrmware Press Return. You will see the following dialog box Downloading conﬁguration ﬁles Transferring conﬁguration and ﬁrmware ﬁles with Xmodem Uploading conﬁguration ﬁles Idle Do you want to send a saved configuration to your Netopia? Restarting the system Conﬁguration problems Appendix a Troubleshooting Network problems Console connection problems Power outages How to reset the router to factory defaults Technical support How to reach usBefore contacting Netopia Environment proﬁle Product information can be found in the following Online product informationOnline Technical Support User’s Reference Guide Appendix B Understanding IP Addressing What is IP?About IP addressing Subnets and subnet masks Subnet masks Example Using subnets on a Class C IP internet ISP Network Network conﬁguration Distributing IP addresses Example Working with a Class C subnetBackground 255.255.255.224 Technical note on subnet masking Conﬁguration Netopia R910 Dhcp server characteristics255.255.255.0 Dhcp address serving Manually distributing IP addresses Using address servingTips and rules for distributing IP addresses MacIP serving Understanding IP Addressing B-181 Dhcp example Nested IP subnets Internet 0.0 C.1 WAN 3719 Packet header types Broadcasts User’s Reference Guide Network conﬁguration Appendix C Understanding Netopia NAT BehaviorBackground User’s Reference Guide Understanding Netopia NAT Behavior C-189 Router Netopia Understanding Netopia NAT Behavior C-191 Exported services Important notes Understanding Netopia NAT Behavior C-193 Summary Appendix D Binary Conversion Table Decimal Binary Appendix E Further Reading User’s Reference Guide Further Reading E-199 User’s Reference Guide Appendix F Technical Specifications and Safety Information Declaration for Canadian users Regulatory notices Telecommunication installation cautions Important safety instructionsBattery User’s Reference Guide Deﬁned B-180 Index Index-206 Index-207 SmartIP Index-208 Index-209