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ZyXEL Communications 623ME-T 5.1NAT Overview, 5.2Single User Account Server (SUA Server), Network Address Translation (NAT), Figure 5-1Single User Account Topology

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Prestige 623ME-T User’s Guide

Chapter 5

Network Address Translation (NAT)

This chapter discusses how to configure NAT on the Prestige.

5.1NAT Overview

NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP address of a host in a packet, for example, the source address of an outgoing packet, used within one network to a different IP address known within another network.

5.2Single User Account Server (SUA Server)

Typically, if there are multiple users on the LAN wanting to concurrently access the Internet, you will have to lease a block of legal, or globally unique, IP addresses from the ISP.

The Single User Account (SUA) feature allows you to have the same benefits as having multiple legal addresses, but only pay for one IP address, thus saving significantly on the subscription fees. (Check with your ISP before you enable this feature).

Figure 5-1 Single User Account Topology

The Single User Account feature may also be used on connections to remote networks other than the ISP. For example, this feature can be used to simplify the allocation of IP addresses when connecting branch offices to the corporate network.

NAT

5-1

Contents

User's Guide Page Copyright Page Federal Communications Commission (FCC) Interference Statement Page ZyXEL Limited Warranty Page Customer Support Page Table of Contents Chapter 6 Dynamic DNS Setup Page Chapter 16 Bridging Setup Chapter 19 SNMP Configuration Chapter 22 System Maintenance Chapter 24 IP Policy Routing Chapter 25 Call Scheduling A-1 B-1 C-1 List of Figures Page Page Page List of Tables Page List of Charts Page Preface Control Panels Modem The following section offers some background information on DSL. Skip to Chapter 1 if you wish to begin working with your router right away User Guide Feedback Introduction to DSL Page Part I: Getting Started Page 1.1Introducing the Prestige 1.2Features of the Prestige Protocols Supported IP Policy Routing Call Scheduling Networking Compatibility Multiplexing 1.3Applications for the Prestige 1.3.1 Internet Access 1.3.2 LAN to LAN Application 2.1Web Configurator Overview 2.2Accessing the Prestige Web Configurator 2.3Navigating the Prestige Web Configurator 2.4Configuring Password 2.5Resetting the Prestige 2.5.1 Using The Reset Button 3.1Wizard Setup Introduction 3.2Encapsulation 3.2.1 PPPoE Encapsulation 3.2.2 RFC 3.3Multiplexing 3.3.1 VC-basedMultiplexing 3.3.2 LLC-basedMultiplexing 3.4VPI and VCI 3.5Wizard Setup Configuration: First Screen 3.6IP Address and Subnet Mask 3.7IP Address Assignment 3.7.1 IP Assignment with PPPoE Encapsulation 3.7.2 IP Assignment with RFC 1483 Encapsulation 3.7.3 Private IP Addresses 3.8NAT 3.9Wizard Setup Configuration: Second Screen 3.9.1 RFC 3.9.2 PPPoE 3.10 DHCP Setup 3.10.1 IP Pool Setup 3.11 Test Your Internet Connection Part II: LAN Page 4.1LAN Overview 4.1.1 LANs, WANs and the Prestige 4.2DNS Server Address 4.3DNS Server Address Assignment 4.4LAN TCP/IP 4.4.1 Factory LAN Defaults 4.4.2 IP Address and Subnet Mask 4.4.3 RIP Setup 4.4.4 Multicast 4.5Configuring LAN Page Page Part III: NAT and Dynamic DNS Page 5.1NAT Overview 5.2Single User Account Server (SUA Server) 5.2.1 Advantages of SUA 5.2.2 Configuring Inside Servers Figure 5-2Multiple Servers Behind NAT Example Table 5-1NAT Mode 5.3Selecting the NAT Mode 5.4Configuring SUA Server Figure 5-4Edit SUA/NAT Server Set Table 5-3Edit SUA/NAT Server Set 6.1Dynamic DNS 6.1.1 DYNDNS Wildcard 6.2Configuring Dynamic DNS Figure 6-1DDNS Table 6-1DDNS Part IV: Remote Management and UPnP Page 7.1Remote Management Overview 7.1.1 Remote Management Limitations 7.1.2 Remote Management and NAT 7.1.3System Timeout 7.2Telnet 7.3FTP 7.4Web 7.5Configuring Remote Management Page 8.1Universal Plug and Play Overview 8.1.1 How do I know if I'm using UPnP 8.1.2 NAT Traversal 8.1.3 Cautions with UPnP 8.2UPnP and ZyXEL 8.2.1 Configuring UPnP 8.3Installing UPnP in Windows Example 8.3.1 Installing UPnP in Windows Me 8.3.2 Installing UPnP in Windows XP 8.4Using UPnP in Windows XP Example 8.4.1 Auto-discoverYour UPnP-enabledNetwork Device Step 3. In the Internet Connection Properties Settings Add When the UPnP-enableddevice is disconnected from your computer, all port mappings will be deleted automatically 8.4.2 Web Configurator Easy Access Local Network Invoke Part V: Maintenance Page 9.1Maintenance Overview 9.2System Status Screen Figure 9-1System Status Table 9-1System Status Page 9.2.1 System Statistics Page 9.3DHCP Table Screen 9.4Diagnostic Screens 9.4.1 Diagnostic General Screen Figure 9-5Diagnostic General Table 9-4Diagnostic General 9.4.2 Diagnostic DSL Line Screen 9.5Firmware Screen Do not turn off the Prestige while firmware upload is in progress Firmware Upload in Process Figure 9-8Network Temporarily Disconnected Back Figure 9-9Error Message Part VI: SMT General Configuration Page 10.1 SMT Introduction 10.1.1 Procedure for SMT Configuration via Telnet 10.1.2 Prestige SMT Menu Overview Figure 10-2Prestige 623ME-TSMT Menu Overview 10.2 Navigating the SMT Interface 10.2.1 System Management Terminal Interface Summary 10.3 Changing the System Password Page 11.1 General Setup 11.2 Configuring Menu Figure 11-1Menu 1 General Setup Table 11-1Menu 1 General Setup 11.2.1 Configuring Dynamic DNS Page 12.1 LAN Setup 12.1.1 LAN Port Filter Setup 12.2 Protocol Dependent Ethernet Setup 12.3 TCP/IP Ethernet Setup and DHCP Table 12-1DHCP Ethernet Setup Menu Fields Table 12-2TCP/IP Ethernet Setup Menu Fields Page 13.1 Internet Access Overview 13.2 IP Policies 13.3 Route IP Setup 13.4 Internet Access Configuration Page Page 14.1 Remote Node Setup Overview 14.2 Remote Node Setup 14.2.1 Remote Node Profile 14.2.2 Encapsulation and Multiplexing Scenarios Figure 14-2Menu 11.1 Remote Node Profile Menu 11.1 – Remote Node Profile Table 14-1Menu 11.1 Remote Node Profile Page 14.2.3 Outgoing Authentication Protocol 14.3 Metric 14.4 Remote Node Network Layer Options Table 14-2Menu 11.3 Remote Node Network Layer Options Refers to local Prestige address, not the remote router address 14.4.1 My WAN Addr Sample IP Addresses 14.5 Remote Node Filter 14.5.1 Web Configurator Internet Security Filter Rules 14.5.2 Web Configurator Filter Sets Figure 14-8Menu 21- Filer Set Configuration Figure 14-9Menu 21.11- WebSet Figure 14-10Menu 21.12- WebSet 14.6 Editing ATM Layer Options 14.6.1 VC-basedMultiplexing (non-PPPEncapsulation) 14.6.2 LLC-basedMultiplexing or PPP Encapsulation Figure 14-12Menu 11.6 for LLC-basedMultiplexing or PPP Encapsulation Page 15.1 IP Static Route Overview 15.2 Configuring an IP static route Figure 15-4Menu12.1.1 Edit IP Static Route Menu 12.1.1 – Edit IP Static Route Setup Table 15-1Menu12.1.1 Edit IP Static Route Page 16.1 Bridging Overview 16.2 Bridge Ethernet Setup 16.2.1 Remote Node Bridging Setup Figure 16-1Menu 11.1 Remote Node Profile and press [ENTER] to edit Menu 11.3 – Remote Node Network Layer Options Figure 16-2Menu 11.3 Remote Node Network Layer Options 16.2.2 Bridge Static Route Setup Page 17.1 NAT Overview 17.2 Applying NAT Figure 17-2Menu 11.3 Applying NAT to the Remote Node Select None to disable NAT or SUA Only to enable the Address Mapping Set of menu 17.3 NAT Server Setup 17.4 General NAT Examples 17.4.1 Example 1: Internet Access 17.4.2 How to configure NAT 17.4.3 Example 2: Configuring an Inside Server 17.4.4 How to configure an Inside Server Page Part VII: SMT Advanced Management Page 18.1 About Filtering Figure 18-1Outgoing Packet Filtering Process Execute Filter Rule 18.2 Configuring a Filter Set Figure 18-4NetBIOS_WAN Filter Rules Summary Figure 18-5NetBIOS_LAN Filter Rules Summary Figure 18-6PPPoE Filter Rules Summary 18.2.1 Filter Rules Summary Menus 18.3 Configuring a Filter Rule 18.3.1 TCP/IP Filter Rule Figure 18-7Menu 21.x.1 TCP/IP Filter Rule Table 18-3Menu 21.x.1 TCP/IP Filter Rule Page Page Figure 18-8Executing an IP Filter 18.3.2 Generic Filter Rule Page 18.4 Filter Types and NAT 18.5 Example Filter Figure 18-11Sample Telnet Filter Filter Set Configuration Filter Rules Summary Figure 18-12Menu 21.3.1 Sample Filter 18.6 Applying Filters and Factory Defaults 18.6.1 Ethernet Traffic 18.6.2 Remote Node Filters Figure 18-15Filtering Remote Node Traffic Page 19.1 SNMP Overview 19.2 Supported MIBs 19.3 SNMP Configuration Figure 19-2Menu 22 SNMP Configuration Table 19-1Menu 22 SNMP Configuration 19.4 SNMP Traps 20.1 System Maintenance Overview 20.2 System Status Figure 20-2Menu 24.1 System Maintenance : Status Table 20-1Menu 24.1 System Maintenance : Status 20.3 System Information 20.3.1 System Information Figure 20-4Menu 24.2.1 System Maintenance : Information Table 20-2Menu 24.2.1 System Maintenance : Information 20.3.2 Console Port Speed 20.4 Log and Trace 20.4.1 Viewing Error Log 20.4.2 Syslog and Accounting CDR Message Format Packet triggered Message Format 20.5 Diagnostic Menu 24 – System Maintenance Figure 20-9Menu 24.4 System Maintenance : Diagnostic Table 20-4Menu 24.4 System Maintenance Menu : Diagnostic Page 21.1 Filename Conventions 21.2 Backup Configuration 21.2.1 Backup Configuration 21.2.2 Using the FTP Command from the Command Line 21.2.3 Example of FTP Commands from the Command Line 21.2.4 GUI-basedFTP Clients 21.2.5 TFTP and FTP over WAN Will Not Work When 21.2.6 Backup Configuration Using TFTP 21.2.7 TFTP Command Example 21.2.8 GUI-basedTFTP Clients 21.3 Restore Configuration 21.3.1 Restore Using FTP 21.3.2 Restore Using FTP Session Example 21.4 Uploading Firmware and Configuration Files 21.4.1 Firmware File Upload 21.4.2 Configuration File Upload 21.4.3 FTP File Upload Command from the DOS Prompt Example 21.4.4 FTP Session Example of Firmware File Upload 21.4.5 TFTP File Upload 21.4.6 TFTP Upload Command Example Page 22.1 Command Interpreter Mode Overview 22.2 Call Control Support 22.2.1 Budget Management 22.3 Time and Date Setting Figure 22-5Menu 24 System Maintenance Figure 22-6Menu 24.10 System Maintenance: Time and Date Setting 22.3.1 Resetting the Time Page 23.1 Remote Management Overview 23.2 Configuring Remote Management 23.2.1 Remote Management Setup 23.2.2 Remote Management Limitations 23.3 Remote Management and NAT 23.4 System Timeout Page 24.1 IP Policy Routing Overview 24.2 Benefits of IP Policy Routing 24.3 Routing Policy 24.4 IP Routing Policy Setup Figure 24-2Menu 25.1 IP Routing Policy Setup Table 24-1Menu 25.1 IP Routing Policy Setup Menu 25.1.1 – IP Routing Policy Figure 24-3Menu 25.1.1 IP Routing Policy Table 24-2Menu 25.1.1 IP Routing Policy 24.5 Applying an IP Policy 24.5.1 Ethernet IP Policies Figure 24-4Menu 3.2 TCP/IP and DHCP Ethernet Setup Figure 24-5Menu 11.3 Remote Node Network Layer Options 24.6 IP Policy Routing Example Figure 24-7IP Routing Policy Example Menu 25.1 — IP Routing Policy Setup Figure 24-8IP Routing Policy Example Figure 24-9Applying IP Policies Example Page 25.1 Call Scheduling Overview To delete a schedule set, enter the set number and press [SPACE BAR] and then [ENTER] (or delete) in the Edit Name field Menu 26.1 — Schedule Set Setup Figure 25-2Menu 26.1 Schedule Set Setup Duration Main Menu PPPoA Figure 25-3Applying Schedule Set(s) to a Remote Node (PPPoE) Part VIII: Appendices and Index Page A.1 Using LEDs to Diagnose Problems A.1.1 Power LED A.1.2 LAN LED A.1.3 DSL LED A.2 Telnet A.3 Web Configurator A.4 Login Username and Password A.5 LAN Interface A.6 WAN Interface A.7 Internet Access A.8 Remote Node Connection Appendix B IP Subnetting IP Addressing IP Classes Chart B-1Classes of IP Addresses Chart B-2Allowed IP Address Range By Class Subnet Masks Chart B-3“Natural” Masks Subnetting Chart B-4Alternative Subnet Mask Notation Example: Two Subnets Chart B-5Subnet Chart B-6Subnet Example: Four Subnets Chart B-7Subnet Chart B-8Subnet Chart B-9Subnet Chart B-10Subnet Example Eight Subnets Chart B-11Eight Subnets Chart B-12Class C Subnet Planning Subnetting With Class A and Class B Networks Chart B-13Class B Subnet Planning Page Appendix C PPPoE PPPoE in Action Benefits of PPPoE Traditional Dial-upScenario How PPPoE Works Prestige as a PPPoE Client Diagram C-2Prestige as a PPPoE Client Appendix D Setting up Your Computer’s IP Address Windows 95/98/Me Configuration Page Page Windows 2000/NT/XP Page Page Page Macintosh OS 8/9 TCP/IP Control Panel Macintosh OS Page Page Appendix E Virtual Circuit Topology Diagram E-1Virtual Circuit Topology Page Appendix F Splitters and Microfilters Connecting a POTS Splitter Diagram F-1Connecting a POTS Splitter Telephone Microfilters Diagram F-2Connecting a Microfilter Appendix G Power Adaptor Specifications Page Appendix H Index