Using Network Address Translation | Netopia R910 specs

IP Setup and Network Address Translation 9-53

Using Network Address Translation

The following procedure describes how to use Network Address Translation.

1.Pick a network number for your local network (referred to as the internal network). This can be any IP address range you want. The Netopia R910 Router has a default IP address of 192.168.1.1. You may choose to change this address to match a pre-existing addressing scheme. For this example, we will use 10.0.0.0.

Note: The outside world (the external network) will not see this network number.

2.Using the internal network number, assign addresses to the local nodes on your LAN. For example, you could assign

■10.0.0.1 to your Netopia R910

■10.0.0.2 to a node running as a World Wide Web server

■10.0.0.3 to an FTP server

■10.0.0.4 to a Windows NT PC

■10.0.0.5 to a Windows 95 PC

Note: See “Associating port numbers with nodes” on page 9-55.

3.By default, Network Address Translation is enabled in the Netopia R910. If you disabled it and now want to reenable it:

From the WAN Conﬁguration menu in the Main Menu screen, select WAN (Wide Area Network) Setup. The WAN Ethernet Conﬁguration screen appears.

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.

Toggle Address Translation Enabled to Yes or No (Yes to enable NAT) and press Return.

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Netopia R910 manual Using Network Address Translation

Contents

Netopia R910 Ethernet Router for DSL and Cable Modems Part Number Contents Iv User’s Reference Guide Contents Snmp Contents Index Overview Features and capabilitiesChapter Introduction How to use this guide Deciding on an ISP account Chapter Setting Up Internet ServicesDSL and cable modems Obtaining information from the ISP Without Network Address Translation Local LAN IP address information to obtainWith Network Address Translation Find a location Chapter Making the Physical Connections Line 1 port Identify the connectors and attach the cablesWhat you need Your router on Netopia R910 Ethernet Router back panel ports 10 12 13 14 15 16 Netopia R910 Ethernet Router status lights Before Chapter Connecting to Your Local Area NetworkNetwork Model After Readying computers on your local network Connecting to Your Local Area Network 10Base-T Connecting to an Ethernet networkPower port Console port 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 Accessing the Easy Setup console screens Chapter Easy SetupEasy Setup console screens Screen similar to the following Main Menu appears If your ISP doesn’t support Dhcp Quick Easy Setup connection pathIf your ISP supports 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 Deleting a static route Rules of static route installationModifying 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 About Pptp Tunnels Pptp configurationConfiguration Add Connection Profile Chap User’s Reference Guide MS-CHAP V2 and strong encryption Encryption SupportIP Proﬁle Parameters screen appears 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 QuickView Interoperation with other featuresVPN QuickView 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 98 VPN installation Installing the VPN ClientWindows 95 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 Network Interface Event historiesPhysical 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 Modifying IP trap receivers Setting the IP trap receiversViewing IP trap receivers Deleting IP trap receivers User’s Reference Guide User accounts Chapter SecuritySuggested security measures Protecting the conﬁguration screens Protecting the Security Options screen Telnet access How ﬁlter sets work About ﬁlters and ﬁlter setsWhat’s a ﬁlter and what’s a ﬁlter set? Filter priority ﬁltering rule How individual ﬁlters workﬁlter’s actions 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 Disadvantages of ﬁlters An approach to using ﬁltersWorking with IP ﬁlters and ﬁlter sets Adding a ﬁlter set Naming a new ﬁlter set Adding ﬁlters to a ﬁlter set Input and output ﬁlters-source and destinationNetopia R910 Router ADD this Filter NOW Cancel Viewing ﬁlters Viewing ﬁlter setsModifying ﬁlters Deleting ﬁlters Sample IP ﬁlter set Modifying ﬁlter setsDeleting a 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 Firewall Logic Firewall design rulesExample TCP/UDP Ports Implied rules Binary representationLogical and function Established connections Filter basicsExample IP ﬁlter set screen This is an example of the Netopia IP ﬁlter set screen Example Example ﬁltersExample network 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 Transferring conﬁguration and ﬁrmware ﬁles with Tftp Factory defaultsDisconnect Telnet console session 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 Online Technical Support Online product informationProduct information can be found in the following User’s Reference Guide About IP addressing What is IP?Appendix B Understanding IP Addressing Subnets and subnet masks Subnet masks Example Using subnets on a Class C IP internet ISP Network Network conﬁguration Background Example Working with a Class C subnetDistributing IP addresses 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 Background Appendix C Understanding Netopia NAT BehaviorNetwork conﬁguration 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 Battery Important safety instructionsTelecommunication installation cautions User’s Reference Guide Deﬁned B-180 Index Index-206 Index-207 SmartIP Index-208 Index-209