ZyXEL Communications 2000W manual Example Two Subnets, Alternative Subnet Mask Notation

Page 111

Prestige 2000W_V2 User’s Guide

Since the mask is always a continuous number of ones beginning from the left, followed by a continuous number of zeros for the remainder of the 32 bit mask, you can simply specify the number of ones instead of writing the value of each octet. This is usually specified by writing a “/” followed by the number of bits in the mask after the address.

For example, 192.1.1.0 /25 is equivalent to saying 192.1.1.0 with mask 255.255.255.128.

The following table shows all possible subnet masks for a class “C” address using both notations.

Table 33 Alternative Subnet Mask Notation

SUBNET MASK IP ADDRESS

SUBNET MASK “1” BITS

LAST OCTET BIT VALUE

 

 

 

255.255.255.0

/24

0000 0000

 

 

 

255.255.255.128

/25

1000 0000

 

 

 

255.255.255.192

/26

1100 0000

 

 

 

255.255.255.224

/27

1110 0000

 

 

 

255.255.255.240

/28

1111 0000

 

 

 

255.255.255.248

/29

1111 1000

 

 

 

255.255.255.252

/30

1111 1100

 

 

 

The first mask shown is the class “C” natural mask. Normally if no mask is specified it is understood that the natural mask is being used.

Example: Two Subnets

As an example, you have a class “C” address 192.168.1.0 with subnet mask of 255.255.255.0.

Table 34 Two Subnets Example

 

NETWORK NUMBER

HOST ID

 

 

 

IP Address

192.168.1.

0

 

 

 

IP Address (Binary)

11000000.10101000.00000001.

00000000

 

 

 

Subnet Mask

255.255.255.

0

 

 

 

Subnet Mask (Binary)

11111111.11111111.11111111.

00000000

 

 

 

The first three octets of the address make up the network number (class “C”). You want to have two separate networks.

Divide the network 192.168.1.0 into two separate subnets by converting one of the host ID bits of the IP address to a network number bit. The “borrowed” host ID bit can be either “0” or “1” thus giving two subnets; 192.168.1.0 with mask 255.255.255.128 and 192.168.1.128 with mask 255.255.255.128.

Appendix B IP Subnetting

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Contents Prestige 2000WV2 Page Prestige 2000WV2 User’s Guide CopyrightDisclaimer TrademarksCertifications Federal Communications Commission FCC Interference StatementSafety 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 Syntax Conventions PrefaceAbout Your Prestige Related DocumentationGraphics Icons Key User Guide FeedbackGetting To Know Your Prestige FeaturesPlace a Call via SIP Proxy Server SIP Call Server ApplicationsDirect IP to IP Calling Ad-Hoc Wireless IntercomPrestige Hardware Descriptions Getting to Know the Prestige HardwarePrestige 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 Select Site Survey Wireless LAN Setup MenusWireless LAN Setup Menus Site SurveyArrow to highlight it and then press the Left key Network ModeSelect Wireless in the first menu screen use the up or down SsidChannel Select Network ModeWEP Encryption RateSelect Key Select Authentication TypeProfiles WEP for encryption, not for authenticationCreate Prestige 2000WV2 User’s Guide Wireless LAN Setup Menus Select IP Address Network SettingsNetwork Settings Fixed IPSelect Subnet Mask DhcpPPPoE Select PPPoE Pwd Select PPPoE NameSelect Registrar Select Registrar IP SIP SettingsSIP Settings Registrar ServerOutbound Proxy Server Select Expiry TimeSelect Outbound Proxy Select Proxy Server Proxy ServerSelect User Account Select Phone Number User AccountSelect User Pwd Prestige 2000WV2 User’s Guide SIP Settings Phonebook PhonebookCalling Methods Adding a Phonebook EntrySelect Add Entry Editing Phonebook EntriesErasing Phonebook Entries Select Speed Dial Speed Dial Phonebook EntriesCall History Missed CallsCall History Received Calls Erasing Calls Dialed CallsSelect Erase Calls Miscellaneous Settings Setting the Ring MelodyMiscellaneous Settings Setting the Vibration Mode Adjusting the Ring VolumeSelect Ringer Volume Select Edit Date Setting the TimeSetting the Date Select Edit TimePress the Left key to save your setting Setting the BannerSetting the Key Lock Select Settings in the first menu screenSelect Don’t Disturb Setting the Don’t DisturbPrestige 2000WV2 User’s Guide Miscellaneous Settings Information Menus Information MenusDisplaying Information Select MAC Address11Select Firmware Ver Dialing a Telephone Number Using the Phonebook to Dial a Telephone NumberUsing Speed Dial to Dial a Telephone Number Prestige UsageChanging the Volume Answering a CallRejecting a Call Using the Web Configurator Screens Using the Web Configurator ScreensIntroduction to the Web Configurator LoginLogin Screen Navigating the Prestige Web ConfiguratorPhone Book Web Configurator User Screens SummarySIP NAT TrvslWeb Configurator Administrator Screens Summary PhoneTOS/DS IP Address Assignment User Web Configurator ScreensUser Web Configurator Screens Device InformationMAC Address IP Address and Subnet MaskDNS Server Network Configuration StaticNetwork Configuration Dhcp CancelApply Dhcp PPPoE Network Configuration Network Configuration PPPoEPPPoE VoIP Introduction12.9.1 SIP SIP IdentitiesInvite SIP Call ProgressionSIP Client Server SIP Call ProgressionSIP Proxy Server 12.9.1.4 RTP SIP ConfigurationSIP Proxy 12.11 NATNAT Types NAT ExampleFull Cone Restricted Cone Port Restricted Symmetric Full Cone NATFull Cone NAT Example Restricted Cone NATSymmetric NAT Port Restricted Cone NATNAT and SIP SIP ALGFake WAN Address on SIP and RTP NAT Traversal Configuration StunOutbound Proxy ALG NAT Traversal ConfigurationStun Phone Book ConfigurationPhone Book Calling MethodsDelete PhonebookPrestige 2000WV2 User’s Guide Phonebook Wireless IntroductionWireless Settings WEP EncryptionWEP Ssid12.19 S/W Update SystemSubmit Zip files before you can upload them W UpdateAdministrator Web Configurator Screens Administrator Web Configurator ScreensType the SIP proxy server settings SIP Proxy ConfigurationSIP URI SIP ConfigurationPrestige 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 Administrator Web Configurator Screens 101 Quality of Service102 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 Troubleshooting 105 Error Message TroubleshootingRestoring the Factory Default Settings Error Message TroubleshootingPrestige 2000WV2 User’s Guide 106 Troubleshooting MIC Specification TablesHardware Specifications Appendix a Product Specifications 107Essid Prestige 2000WV2 User’s Guide Firmware Features108 Appendix a Product Specifications HTTP, TFTP, TCP, UDP, DNS, ARP, IcmpAppendix B IP Subnetting 109 IP AddressingIP Classes Classes of IP AddressesNatural Masks Subnet MasksSubnetting Allowed IP Address Range By ClassAppendix B IP Subnetting 111 Example Two SubnetsAlternative Subnet Mask Notation Two Subnets Example112 Appendix B IP Subnetting SubnetAppendix B IP Subnetting 113 Example Four Subnets114 Appendix B IP Subnetting Example Eight SubnetsEight Subnets Class C Subnet PlanningSubnetting 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 Appendix C PPPoE 117 PPPoE in ActionBenefits of PPPoE Traditional Dial-up ScenarioPrestige as a PPPoE Client How PPPoE WorksWireless LAN Topologies Ad-hoc Wireless LAN ConfigurationAppendix D Wireless LANs 119 120 Appendix D Wireless LANs Basic Service SetInfrastructure Wlan Appendix D Wireless LANs 121Prestige 2000WV2 User’s Guide 122 Appendix D Wireless LANs Dtmf IndexNumerics Index 123711 22, 98 729 22, 99 124 IndexIndex 125 SIP ALG 126 IndexWlan Index 127
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