ZyXEL Communications 2000W manual Restricted Cone NAT, Full Cone NAT Example

Page 84

Prestige 2000W_V2 User’s Guide

Figure 22 Full Cone NAT Example

12.11.2.2 Restricted Cone NAT

As in full cone NAT, a restricted cone NAT router maps all outgoing packets from an internal IP address and port to a single IP address and port on the external network. In the following example, the NAT router maps the source address of all packets sent from internal IP address 1 and port A to IP address 2 and port B on the external network.

The difference from full cone NAT is in how the restricted cone NAT router handles packets coming in from the external network. A host on the external network (IP address 3 or IP address 4 for example) can only send packets to the internal host if the internal host has already sent a packet to the external host’s IP address.

A Prestige with IP address 1 and port A sends packets to IP address 3 and IP address 4. The NAT router changes the Prestige’s IP address to 2 and port to B.

Both 4, D and 4, E can send packets to 2, B since 1, A has already sent packets to 4. The NAT router will perform NAT on the packets from 4, D and 4, E and send them to the Prestige at IP address 1, port A. Packets have not been sent from 1, A to 3 or 5, so 3 and 5 cannot send packets to 1, A.

Figure 23 Restricted Cone NAT Example

84	Chapter 12 User Web Configurator Screens

Image 84

Contents Prestige 2000WV2 Page Copyright DisclaimerTrademarks Prestige 2000WV2 User’s GuideFederal Communications Commission FCC Interference Statement CertificationsSafety Warnings Safety WarningsZyXEL Limited Warranty ZyXEL Limited WarrantyCustomer Support Customer SupportUnited Kingdom Table of Contents Chapter Network Settings Chapter Information Menus Appendix a Product Specifications 107 Appendix B Appendix C Prestige 2000WV2 User’s Guide Table of Contents List of Figures List of FiguresPeer-to-Peer Communication in an Ad-hoc Network 119 List of Tables List of TablesEight Subnets Preface About Your PrestigeRelated Documentation Syntax ConventionsUser Guide Feedback Graphics Icons KeyFeatures Getting To Know Your PrestigeApplications Place a Call via SIP Proxy Server SIP Call ServerAd-Hoc Wireless Intercom Direct IP to IP CallingGetting to Know the Prestige Hardware Prestige Hardware DescriptionsPrestige 2000WV2 User’s Guide Prestige 2000WV2 User’s Guide Getting To Know Your Prestige Using the LCD Screen Menus Using the LCD Screen MenusLCD Main Screen Navigating the LCD Screen Menus Text InputPrestige 2000WV2 User’s Guide LCD Main Screen Press the OK key when you are done Prestige 2000WV2 User’s Guide Using the LCD Screen Menus Wireless LAN Setup Menus Wireless LAN Setup MenusSite Survey Select Site SurveyNetwork Mode Select Wireless in the first menu screen use the up or downSsid Arrow to highlight it and then press the Left keySelect Network Mode ChannelRate WEP EncryptionAuthentication Type Select Key SelectWEP for encryption, not for authentication ProfilesCreate Prestige 2000WV2 User’s Guide Wireless LAN Setup Menus Network Settings Network SettingsFixed IP Select IP AddressDhcp Select Subnet MaskPPPoE Select PPPoE Name Select PPPoE PwdSIP Settings SIP SettingsRegistrar Server Select Registrar Select Registrar IPOutbound Proxy Server Select Expiry TimeSelect Outbound Proxy Proxy Server Select Proxy ServerUser Account Select User Account Select Phone NumberSelect User Pwd Prestige 2000WV2 User’s Guide SIP Settings Phonebook Calling MethodsAdding a Phonebook Entry PhonebookEditing Phonebook Entries Select Add EntryErasing Phonebook Entries Speed Dial Phonebook Entries Select Speed DialCall History Missed CallsCall History Received Calls Dialed Calls Erasing CallsSelect Erase Calls Miscellaneous Settings Setting the Ring MelodyMiscellaneous Settings Setting the Vibration Mode Adjusting the Ring VolumeSelect Ringer Volume Setting the Time Setting the DateSelect Edit Time Select Edit DateSetting the Banner Setting the Key LockSelect Settings in the first menu screen Press the Left key to save your settingSetting the Don’t Disturb Select Don’t DisturbPrestige 2000WV2 User’s Guide Miscellaneous Settings Information Menus Displaying InformationSelect MAC Address Information Menus11Select Firmware Ver Using the Phonebook to Dial a Telephone Number Using Speed Dial to Dial a Telephone NumberPrestige Usage Dialing a Telephone NumberChanging the Volume Answering a CallRejecting a Call Using the Web Configurator Screens Introduction to the Web ConfiguratorLogin Using the Web Configurator ScreensNavigating the Prestige Web Configurator Login ScreenWeb Configurator User Screens Summary SIPNAT Trvsl Phone BookWeb Configurator Administrator Screens Summary PhoneTOS/DS User Web Configurator Screens User Web Configurator ScreensDevice Information IP Address AssignmentIP Address and Subnet Mask MAC AddressNetwork Configuration Static DNS ServerNetwork Configuration Dhcp CancelApply Dhcp Network Configuration PPPoE PPPoE Network ConfigurationVoIP Introduction 12.9.1 SIPSIP Identities PPPoESIP Call Progression SIP Client ServerSIP Call Progression InviteSIP Proxy Server SIP Configuration 12.9.1.4 RTP12.11 NAT SIP ProxyNAT Example NAT TypesFull Cone NAT Full Cone Restricted Cone Port Restricted SymmetricRestricted Cone NAT Full Cone NAT ExamplePort Restricted Cone NAT Symmetric NATNAT and SIP SIP ALGFake WAN Address on SIP and RTP NAT Traversal Configuration StunOutbound Proxy NAT Traversal Configuration ALGPhone Book Configuration Phone BookCalling Methods StunPhonebook DeleteWireless Introduction Wireless SettingsWEP Encryption Prestige 2000WV2 User’s Guide PhonebookSsid WEP12.19 S/W Update SystemSubmit W Update Zip files before you can upload themAdministrator Web Configurator Screens Administrator Web Configurator ScreensSIP Proxy Configuration Type the SIP proxy server settingsSIP Configuration SIP URIPrestige 2000WV2 User’s Guide IP Configuration Voice Coding13.3.1 G.711 Pstn Call Setup Signaling Phone Setting13.3.2 G.729 100 Administrator Web Configurator Screens Quality of Service Administrator Web Configurator Screens 101102 Administrator Web Configurator Screens 13.8 ToSIntroduction to DiffServ Troubleshooting Problems Starting Up the PrestigeProblems Using the Keypad Problems Accessing the Prestige Troubleshooting Accessing the Prestige104 Troubleshooting Error Message Troubleshooting Restoring the Factory Default SettingsError Message Troubleshooting Troubleshooting 105Prestige 2000WV2 User’s Guide 106 Troubleshooting Specification Tables Hardware SpecificationsAppendix a Product Specifications 107 MICPrestige 2000WV2 User’s Guide Firmware Features 108 Appendix a Product SpecificationsHTTP, TFTP, TCP, UDP, DNS, ARP, Icmp EssidIP Addressing IP ClassesClasses of IP Addresses Appendix B IP Subnetting 109Subnet Masks SubnettingAllowed IP Address Range By Class Natural MasksExample Two Subnets Alternative Subnet Mask NotationTwo Subnets Example Appendix B IP Subnetting 111Subnet 112 Appendix B IP SubnettingExample Four Subnets Appendix B IP Subnetting 113Example Eight Subnets Eight SubnetsClass C Subnet Planning 114 Appendix B IP SubnettingSubnetting With Class a and Class B Networks Class B Subnet PlanningAppendix B IP Subnetting 115 Prestige 2000WV2 User’s Guide 116 Appendix B IP Subnetting PPPoE in Action Benefits of PPPoETraditional Dial-up Scenario Appendix C PPPoE 117How PPPoE Works Prestige as a PPPoE ClientWireless LAN Topologies Ad-hoc Wireless LAN ConfigurationAppendix D Wireless LANs 119 Basic Service Set 120 Appendix D Wireless LANsAppendix D Wireless LANs 121 Infrastructure WlanPrestige 2000WV2 User’s Guide 122 Appendix D Wireless LANs Index NumericsIndex 123 Dtmf124 Index 711 22, 98 729 22, 99Index 125 126 Index SIP ALGIndex 127 Wlan

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