deXlan 050862 Appendix B IP Address, Subnet and Gateway, Communities, Gateways, IP Addresses

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Appendix C: IP Address, Subnet and Gateway

Appendix B: IP Address, Subnet and Gateway

This section discusses Communities, Gateways, IP Addresses and Subnet masking

Communities

A community is a string of printable ASCII characters that identifies a user group with the same access privileges. For example, a common community name is “public.” For security purposes, the SNMP agent validates requests before responding. The agent can be configured so that only trap managers that are members of a community can send requests and receive responses from a particular community. This prevents unauthorized managers from viewing or changing the configuration of a device.

Gateways

Gateway, also referred to as a router, is any computer with two or more network adapters connecting to different physical networks. Gateways allow for transmission of IP packets among networks on an Internet.

IP Addresses

Every device on an Internet must be assigned a unique IP (Internet Protocol) address. An IP address is a 32-bit value comprised of a network ID and a host ID. The network ID identifies the logical network to which a particular device belongs. The host ID identifies the particular device within the logical network. IP addresses distinguish devices on an Internet from one another so that IP packets are properly transmitted.

IP addresses appear in dotted decimal (rather than in binary) notation. Dotted decimal notation divides the 32-bit value into four 8-bit groups, or octets, and separates each octet with a period. For example, 199.217.132.1 is an IP address in dotted decimal notation.

To accommodate networks of different sizes, the IP address has three divisions – Classes A for large, B for medium and C for small. The difference among the network classes is the number of octets reserved for the network ID and the number of octets reserved for the host ID.

Class	Value of First Octet	Network ID	Host ID	Number of Hosts
A	1-126	First octet	Last three octets	16,387,064
B	128-191	First two octets	Last two octets	64,516
C	192-223	First tree octets	Last octet	254

Any value between 0 and 255 is valid as a host ID octet except for those values the InterNIC reserves for other purposes

Value	Purpose
0, 255	Subnet masking

127Loopback testing and interprocess communication on local devices 224-254 IGMP multicast and other special protocols.

iCAMView user manual

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Contents IP Camera Contents Device View System User Help Drag-and-Drop Feature Features IntroductionPackage Contents IP Camera Back View Installation Procedure IP Camera installation flowchartInstallation Procedure IP Camera, USB Camera and the NetworkICAMView, USB Camera and the Network Using Utility to Setup IP & Update Firmware Installing UtilityUsing Utility Setup Wizard Using Utility to Setup IP & Update Firmware Using Utility to Setup IP & Update Firmware Using Utility to Setup IP & Update Firmware Using Utility to Setup IP & Update Firmware Launch IP Camera IP Configuration IPAddress AdvancedDevice Password IP Configuration IP Camera Advanced settingsIi. Management Protocol For exampleAbout RefreshIP Camera Web Manager IntroductionIP Camera Web Manager Interface Web-Camera Selection System Status InformationSystem Information Current Connections Ii. System InformationBasic Settings Event LogCamera Settings Network Account Settings Camera SettingsSetting up Camera a Similar with Camera B IP Address NetworkIi. DNS Server IP Iv. Ethernet Iii. Port NumberDynamic DNS Vi. PPPoE Account SettingsUser Account User Name An Administrator has full access including write Advanced Settings Event NotificationEvent Notification Send Email IP Camera Event NotificationIP Camera Event Selection List Samples Camera a or Camera B Enable Motion DetectionIP Camera Motion Detection IP Camera Motion Detect Email Notification Image Recording Camera a or Camera B Begin End hhmmMail / FTP IP Camera Email of Image RecordedFTP Settings FTP Server Ii. Email Settings E-mail ServerIii. Sending Test Mail IP Camera test mail functionSystem Settings Iv. Email Address BookIv. Snmp Settings Iii. LED SettingsIi. System Restart Image Server Language Ii. Save / Restore Settings Save current Configuration Interface LanguageIi. Email Preference AboutViewing images using PDA / Web enabled mobile phone IP Camera AboutAccessing IP Camera via PDA Installing MultiMonitor MultiMonitorMultiMonitor MultiMonitor Device MultiMonitor Display the current Camera settings Display the Motion Detection Settings REDImage Recording Configure Settings for Email Notification Avifilethree digit numerical sequenceSnmp Settings Server Require AuthenticationNotified Email Address Using Snmp to update network ports MultiMonitor MultiMonitor View SystemUser Help Drag-and-Drop Feature StepDouble click on the icon on the desktop, to view the images Appendix a Router Configuration Port Forwarding for IP CameraSMC SMC2404WBR Appendix a Router Configuration TCP UDP TCP Appendix a Router Configuration Appendix a Router Configuration Appendix a Router Configuration Appendix a Router Configuration Appendix a Router Configuration Action Allow always Appendix a Router Configuration TCP TCP Appendix a Router Configuration TCP Appendix a Router Configuration Appendix B IP Address, Subnet and Gateway CommunitiesGateways IP AddressesSubnetting and Subnet Masks Subnet Mask Routing and FilteringAppendix C Glossary Term Definition