Paradyne 6381-A3 manual What is a Router?

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A. Terminology

Your machine isn't really directly connected to the Internet, and it really has an internal local network address. When you provide the server's network address to others, you actually provide the address of the router. The router fakes the connection to your machine.

You should use the DMZ when you want to run a server that others will access from the Internet. Internal programs and servers (like print servers) should not be connected to the DMZ.

What is a Router?

The Internet is so large that a single network cannot handle all of the traffic and still deliver a reasonable level of service. To overcome this limitation, the network is broken down into smaller segments or subnets that can deliver good performance for the stations attached to that segment. This segmentation solves the problem of supporting a large number of stations, but introduces the problem of getting traffic from one subnet to another.

To accomplish this, devices called routers are placed between segments. If a machine wishes to contact another device on the same segment, it transmits to that station directly using a simple discovery technique. If the target station does not exist on the same segment as the source station, then the source actually has no idea how to get to the target.

One of the configuration parameters transmitted to each network device is its default gateway. This address is configured by the network administrators and it informs each personal computer or other network device where to send data if the target station does not reside on the same subnet as the source. If your machine can reach all stations on the same subnet (usually a building or a sector within a building), but cannot communicate outside of this area, it is usually because of an incorrectly configured default gateway.

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January 2005

6381-A2-GB23-10

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Contents 6381-A3 Router Copyright 2005 Paradyne Corporation All rights reserved Important Safety Instructions 6381-A2-GB23-10 Canada EMI Notice Japan Notices Contents Contents Index TroubleshootingTerminology Contents January Document Summary About This GuideDocument Purpose and Intended Audience Product-Related Documents Definitions Features of the 6381 RouterIntroduction System Requirements Ports and Buttons Back PanelLED Description Front Panel Packing List Overview Hardware Installation PC SetupConnecting the Hardware Hardware Installation Configuring Your PC Windows USB Driver InstallationNew Hardware Installation Options Completing the Found New Hardware Wizard Windows XP Configuring Your PC’s IP AddressAssigning an IP Address to your PC Automatically by Dhcp Network Connections in Windows XP Windows TCP/IP Properties in Windows XPWindows ME Windows 95 Windows NT Hardware Installation and PC Setup January Using the Web Interface Logging Into Your RouterHome Quick StartQuick Start Dhcp Quick Start Static Local Area Network Connection SetupWide Area Network Connection Saving ChangesConfiguring the WAN PPPoE Connection Setup New ConnectionPPPoE Connection Setup PPPoA Connection Setup PPPoA Connection Setup Static Connection Setup Dhcp Connection Setup Static IP Connection Setup10. Dhcp Connection Setup Bridged Connection11. Bridged Connection Setup Clip Connection 12. Clip Connection Setup Modify an Existing ConnectionModem Setup TsmlConfiguring the LAN 14. Tsml ConnectionEnable/Disable Dhcp 16. LAN Group 1 ConfigurationChanging the Routers IP address Firewall/NAT Services 17. Firewall/NAT Services ScreenAdvanced UPnPSntp Snmp IP QoS Port Forwarding22. Port Forwarding Netmeeting IP Filters 23. IP FiltersLAN Clients LAN IsolationBridge Filters 25. LAN Isolation26. Bridge Filters Multicast 27. MulticastIgmp Snooping Static RoutingDynamic Routing 29. Static Routing30. Dynamic Routing Access Control Log OutRemote Log System CommandsTools User Management Severity Levels 2 DescriptionUpdate Gateway 33. Update GatewayAnalyzer Ping TestModem Test 35. Ping TestStatus 37. Product InformationUsing the Web Interface January You Cannot Connect to the Router TroubleshootingRouter Is Not Functional Status LED is Always Off LEDs Blink in a Sequential PatternStatus LED Continues to Blink What is a DMZ? What is a Firewall?What is NAT? TerminologyWhat is a Router? Index DhcpIN-2 IN-3 IN-4