3Com iCV-01a, iCV-08, iCV-03a Subnetting and Subnet Masks, Subnet Mask Routing and Filtering

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Appendix C: IP Address, Subnet and Gateway

Subnetting and Subnet Masks

Subnetting divides a network address into sub-network addresses to accommodate more than one physical network on a logical network.

For example:

A Class B company has 100 LANs (Local Area Networks) with 100 to 200 nodes on each LAN. To classify the nodes by its LANs on one main network, this company segments the network address into 100 sub-network addresses. If the Class B network address is 150.1.x.x, the address can be segmented further from 150.1.1.x through 150.1.100.x

A subnet mask is a 32-bit value that distinguishes the network ID from the host ID for different sub-networks on the same logical network. Like IP addresses, subnet masks consist of four octets in dotted decimal notation. You can use subnet masks to route and filter the transmission of IP packets among your sub-networks. The value “255” is assigned to octets that belong to the network ID, and the value “0” is assigned to octets that belong to the host ID.

For the example above, if you want all the devices on the sub-networks to receive each other’s IP packets, set the subnet mask to 255.255.0.0. If you want the devices on a single sub-network only to receive IP packets from other devices on its own sub-network, set the subnet mask to 255.255.255.0 for the devices on the sub-network.

Subnet Mask Routing and Filtering

0.0.0.0IP packets are transmitted to all devices.

255.0.0.0IP packets are only transmitted to devices that are IP that’s first octet matches the sender’s IP address’s first octet.

255.255.0.0	IP packets are only transmitted to devices that are IP that’s first two
	octets match the sender’s IP address’s first two octets.
255.255.255.0	IP packets are only transmitted to devices that are IP that’s first three
	octets match the sender’s IP address’s first three octets.

WebCAM - user manual

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Contents WebCAM ICV-01a / iCV-03a / iCV-08Contents Page Features IntroductionPackage Contents WebCAM Front and Back view Hardware Installation StepWeb Interface IntroductionUsing the Web Interface View Video Information Basic Settings Advanced SettingsUsing ActiveX Controls To View VideoWeb Interface Web Interface Using Sun Java Controls Web Interface System Information InformationSystem Status Ii. Network StatusCurrent Connections Event LogWebCAM Event Log Operator privilege Basic Settings Camera SettingsPatrol Settings Auto Patrolling HotSpot SettingsBoundary FormatNetwork Iv. Port Number Primary DNS Server IPSecondary DNS Server IP Http Port NumberUse Default Domain Name WebCAM Default Dynamic DNSRegistration complete. Account details shown as follows Login Password Service ProviderLogin Name Ii. Other Dynamic DNSUse Public IP to register Account SettingsWhen Connection should be made Iii. PPPoEPermission PasswordUser Name IP FilterIi. Block IP address Blocked IP ListAdvanced Settings Event NotificationRecipients EventsWeb Interface Event Notification Camera a Motion Detected Camera a or Camera B EnableMotion Detection Always On orStop sending after … emails or image idle for … seconds Detection SensitivitySend image every … seconds ScheduleEmail Server … Loop from … to …Digits … RecipientSend image every … minutes Image RecordingBegin End hhmm Send to FTP Server & Send EmailMail / FTP Email of Image RecordedEmail Server Requires Authentication FTP SettingsIi. Email Settings FTP ServerIii. Sending Test Mail Sending a test mailSystem Settings Iv. Email Address BookSystem Time Updates System TimeTime Server Time Zone Relative to GMT Iii. LED SettingsIv. Snmp Settings System Time yyyy/mm/dd hhmmssImage Server Choose Yes to enable this feature or No to disable Community. Click Add to add WebCAM to My List Unit added to My List Language Interface LanguageIi. Email Preference Restore Previous Configuration Ii. Save / Restore SettingsSave Current Configuration Reset to factory defaultView Images Using PDA / PPC / mobile View Images Using PDA / PPC / mobile Using the Utility InstallationSetup Wizard Click on Setup WizardBasic Settings Account Settings Obtain an IP address by Dhcp Use the following IP AddressObtain an IP address by Bootp Select Enable PPPoE connectionUsing the Utility Program Launch WebCAM Using the Utility Program IP Configuration IP AddressAdvanced for password and Http configuration Device Password when accessing from UtilityClick IP Configuration Ii. Management ProtocolUpgrade Firmware RefreshUser can do a manual search by clicking the Refresh Installing MultiMonitor MultiMonitorMultiMonitor MultiMonitor Device User Password Access by WebCAM Address Host Address Remote PortAccess by Image Server Image Server Address Image Server PortMultiMonitor Image Zoom Display the current Camera settings Camera SelectAccount Camera RotationDetect Display the Motion Detection Settings Enable MotionWhen Motion SensitivityCompression PathConfigure Settings for Email Notification Snmp Settings Using Snmp to update network portsProtocol MultiMonitor MultiMonitor MultiMonitor View SystemChange Password … UserAccount Management… Help Add User…Permission Choose Manager or User Drag-and-Drop Feature Double click on the icon on the desktop, to view the images Appendix a Router Configuration Port Forwarding for WebCAMSMC 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 Methods to Update WebCAM Firmware Method 2 Using the Utility softwareMethod 1 Through WebCAM Web Appendix C IP Address, Subnet and Gateway Subnetting and Subnet Masks Subnet Mask Routing and FilteringAppendix D Glossary Term Definition