3Com 3CR856-95 IP Addressing, Internet Protocol Suite, IP Addresses and Subnet Masks, Type One

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IP ADDRESSING

The Internet Protocol Suite

The Internet protocol suite consists of a well-defined set of communications protocols and several standard application protocols. Transmission Control Protocol/Internet Protocol (TCP/IP) is probably the most widely known and is a combination of two of the protocols (IP and TCP) working together. TCP/IP is an internationally adopted and supported networking standard that provides connectivity between equipment from many vendors over a wide variety of networking technologies.

IP Addresses and Subnet Masks

Each device on your network must have a unique IP address to operate correctly. An IP address identifies the address of the device to which data is being sent and the address of the destination network. IP addresses have the format n.n.n.x where n is a decimal number between 0 and 255 and x is a number between 1 and 254 inclusive.

However, an IP Address alone is not enough to make your device operate. In addition to the IP address, you need to set a subnet mask. All networks are divided into smaller sub-networks and a subnet mask is a number that enables a device to identify the sub-network to which it is connected.

For your network to work correctly, all devices on the network must have:

■The same sub-network address.

■The same subnet mask.

The only value that will be different is the specific host device number. This value must always be unique.

An example IP address is ‘192.168.100.8’. However, the size of the network determines the structure of this IP Address. In using the Gateway, you will probably only encounter two types of IP Address and subnet mask structures.

Type One

In a small network, the IP address of ‘192.168.100.8’ is split into two parts:

■Part one (‘192.168.100’) identifies the network on which the device resides.

■Part two (‘.8’) identifies the device within the network.

This type of IP Address operates on a subnet mask of ‘255.255.255.0’.

See Table 3 for an example about how a network with three PCs and a Cable/DSL Secure Gateway might be configured.

Table 3 IP Addressing and Subnet Masking in a Small Network

Device

IP Address

Subnet Mask

 

 

 

PC 1

192.168.100.8

255.255.255.0

 

 

 

PC 2

192.168.100.33

255.255.255.0

 

 

 

PC 3

192.168.100.188

255.255.255.0

 

 

 

Cable/DSL

192.168.100.72

255.255.255.0

Secure Gateway

 

 

 

 

 

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Contents Page United States Government Legend 3Com Corporation Bayfront Plaza Santa Clara, CaliforniaContents Using Discovery TroubleshootingIP Addressing End User Software Licence Agreement Safety InformationISP Information Index Regulatory NoticesPage Naming Convention About this GuideConventions Icon DescriptionFeedback about this User Guide Related DocumentationProduct Registration OfficeConnect Cable/DSL Secure Gateway Introducing the Officeconnect CABLE/DSL Secure GatewayCable/DSL Secure Gateway Advantages Example Network Using a Cable/DSL Secure GatewayMinimum System and Component Requirements Package ContentsFront Panel Power LED GreenAlert LED Orange Flashing slowly Two seconds on, two seconds offRear Panel Power Adapter socketCable/DSL Status LED Ethernet Cable/DSL portPage Before you Install your Gateway Installing the GatewayIntroduction Positioning the GatewayStatic PPPoEConnecting the Cable/DSL Secure Gateway Powering Up the GatewayPage Obtaining an IP Address Automatically Setting UP Your ComputersWindows 2000, XP Windows 95, 98, ME Disabling PPPoE and Pptp Client SoftwareMacintosh OS 8.5 Internet Properties Disabling Web ProxyPage Accessing the Wizard Running the Setup WizardWelcome Screen Setting the PasswordTo set the Gateway to World Time UTC Setting the Time ZoneInternet Settings Auto-Configuration SettingsDynamic IP Address Mode Static IP ModeConnection, use the following procedure PPPoE ModePptp Screen Pptp ModeActivating Dhcp Choosing your LAN SettingsViewing the Summary Dhcp Server Setup ScreenPage Navigating Through the Gateway Configuration Pages Gateway ConfigurationMain Menu Option TabsWelcome Screen Password ScreenSetup Wizard LAN SettingsLAN IP Settings Changing the LAN SettingsChanging the Dhcp Server Settings Dhcp Clients Screen Dhcp Clients ListStatic IP Address DSL or Cable Internet SettingsConnection to ISP Screen Connection to ISPStatic Address Setup Screen Configuring a Static IP AddressDynamic Address Setup Screen Configuring a Dynamic IP AddressPPPoE Setup Screen Configuring a PPPoE connectionConfiguring a Pptp connection Setting up NATOne-to-Many and One-to-One NAT Setting up One-to-Many NATSetting up One-to-One NAT Configuring the FirewallVirtual Servers Menu Creating a Virtual DMZ Creating a Virtual ServerPC Privileges Virtual Servers Settings ScreenTo assign different access rights for different computers To use access control for all computersSpecial Applications Screen Special ApplicationsCreating Custom Special Applications Adding and Editing Special ApplicationsCustom Special Applications Setup Screen Advanced Advanced Settings ScreenSetting the VPN Mode Configuring VPNsIPSec Configuration Address Pool for Pptp and L2TP clients field enter L2TP ConfigurationViewing VPN Connections Pptp ConfigurationAdding and Editing VPN Connections IPSec Connections using Gateway to Gateway IPSec Connections using Remote User AccessIPSec Connection Gateway to Gateway Connection Name field enter headsales L2TP over IPSec ConnectionsPptp Connections Editing IPSec RoutesRestart Accessing the System ToolsTime Zone Loading and Saving the Gateway ConfigurationUpgrading the Firmware of your Gateway Upgrade ScreenStatus Screen Viewing Status and LogsObtaining Support and Feedback for your Gateway Log Settings ScreenFeedback Screen Browsing to the Gateway Configuration Screens TroubleshootingBasic Connection Checks Forgotten Password Connecting to the InternetHttp//192.168.1.1 Alert LEDDoes the Gateway support virtual private networks VPNs? Frequently Asked QuestionsWindows Installation 95/98/2000/Me/NT Using DiscoveryRunning the Discovery Application Discovery Finish Screen Internet Protocol Suite IP AddressingIP Addresses and Subnet Masks Type OneDhcp Addressing How does a Device Obtain an IP Address and Subnet Mask?Static Addressing Type TwoAuto-IP Addressing Private IP AddressesPage Standards Technical SpecificationsSystem Requirements Cable SpecificationsEthernet Performance Operating SystemsImportant Safety Information Safety InformationWichtige Sicherheitshinweise Consignes importantes de sécurité Page Page 3Com Corporation END User Software Licence AgreementPage ISP Information Internet Characteristics Popular ISPs Connection TypesInformation Regarding Popular ISPs Page Glossary Ethernet DSL modemEthernet Address Fast EthernetIPSec IP AddressL2TP over IPSec MAC AddressNetwork SwitchNetwork Interface Card NIC ProtocolWizard TrafficPage Numbers IndexIeee Ietf NAT Ping VPN Page FCC Statement Regulatory Notices100 Page DUA08569-5AAA02 Published November
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3CR856-95 specifications

The 3Com 3CR856-95 is a versatile networking device designed to meet the demands of small to medium-sized businesses. As a part of the 3Com OfficeConnect series, the 3CR856-95 combines switching, routing, and security features into a compact, integrated solution that enhances network performance and reliability.

One of the main features of the 3CR856-95 is its ability to support multiple network configurations. It operates as a router and switch simultaneously, offering six Ethernet ports for wired connections, while also integrating wireless capabilities. This allows businesses to connect various devices seamlessly, including computers, printers, and smartphones, providing flexibility and convenience in a modern office environment.

The device incorporates advanced technologies such as Quality of Service (QoS) which prioritizes network traffic to ensure that bandwidth-intensive applications like video conferencing and VoIP run smoothly. This feature is essential for maintaining productivity and communication efficiency in busy office settings. Additionally, the 3CR856-95 supports both IPv4 and IPv6 protocols, making it a future-proof solution as businesses transition to the newer Internet Protocol standard.

Security is a critical consideration for any networking equipment, and the 3CR856-95 addresses this with robust measures. It includes a built-in firewall that protects the network from external threats, along with support for Virtual Private Networks (VPN), allowing secure remote access for employees working from off-site locations. Furthermore, the device supports WPA2 encryption for wireless connections, safeguarding sensitive data transmitted over the network.

Another important characteristic of the 3CR856-95 is its user-friendly interface, which simplifies the setup and management of the network. The device features a web-based management console that allows network administrators to easily configure settings, monitor traffic, and troubleshoot issues from any internet-connected device. This accessibility saves time and reduces the complexity often associated with network management.

In summary, the 3Com 3CR856-95 is a robust and feature-rich networking solution tailored for small to medium-sized businesses. With its combination of switching, routing, and security features, it provides a reliable platform for facilitating seamless communication and connectivity. Its support for advanced technologies and user-friendly management interface makes it a smart choice for organizations looking to enhance their network infrastructure.
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