Linksys HG200 Planning Your Network, Gateway’s Functions, IP Addresses, What’s an IP Address?

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Home Wireless-G Gateway

Chapter 2: Planning Your Network

The Gateway’s Functions

A Gateway is a network device that connects two networks together.

In this instance, the Gateway connects your Local Area Network (LAN), or the group of computers in your home or office, to the Internet. The Gateway processes and regulates the data that travels between these two networks.

The Gateway’s NAT feature protects your network of computers so users on the public, Internet side cannot “see” your computers. This is how your network remains private. The Gateway protects your network by inspecting every packet coming in through the Internet port before delivery to the appropriate computer on your network. The Gateway inspects Internet port services like the web server, ftp server, or other Internet applications, and, if allowed, it will forward the packet to the appropriate computer on the LAN side.

Remember that the Gateway’s ports connect to two sides. The Ethernet port connects to the LAN, and the ADSL port connects to the Internet. The Ethernet port transmits data at 10/100Mbps.

IP Addresses

What’s an IP Address?

IP stands for Internet Protocol. Every device on an IP-based network, including computers, print servers, and Gateways, requires an IP address to identify its “location,” or address, on the network. This applies to both the Internet and LAN connections. There are two ways of assigning an IP address to your network devices. You can assign static IP addresses or use the Gateway to assign IP addresses dynamically.

Static IP Addresses

A static IP address is a fixed IP address that you assign manually to a computer or other device on the network. Since a static IP address remains valid until you disable it, static IP addressing ensures that the device assigned it will always have that same IP address until you change it. Static IP addresses must be unique and are commonly used with network devices such as server computers or print servers.

Chapter 2: Planning Your Network

Figure 2-1: Network

ip (internet protocol): a protocol used to send data over a network

NOTE: Since the Gateway is a device that connects two networks, it needs two IP addresses—one for the LAN, and one for the Internet. In this User Guide, you’ll see references to the “Internet IP address” and the “LAN IP address.”

Since the Gateway uses NAT technology, the only IP address that can be seen from the Internet for your network is the Gateway’s Internet IP address.

However, even this Internet IP address can be blocked, so that the Gateway and network seem invisible to the Internet—see the Block WAN Requests description under Security in “Chapter 5: Configuring the Home Wireless-G Gateway.”

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The Gateway’s Functions

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Contents 4802GHz.11g Home Wireless-G Copyright and Trademarks How to Use this GuideWord definition Table of Contents Ethernet Adapter Ports and Reset Button on Side Panel Network23 Internet Access Introduction WelcomeWhat’s in this User Guide? Home Wireless-G Gateway IP Addresses Planning Your NetworkGateway’s Functions What’s an IP Address?Dhcp Dynamic Host Configuration Protocol Servers Dynamic IP AddressesGetting to Know the Home Wireless-G Gateway Ports and Reset Button on Side PanelWireless LEDs on Side PanelBottom Panel Bottom Panel with Stand in Closed PositionConnecting the Home Wireless-G Gateway OverviewWired Connection to a Computer Connect the Adsl LineWireless Connection to a Computer Setup Configuring the Home Wireless-G GatewayWireless Security Access RestrictionsAdministration Applications & GamingBasic Setup Tab How to Access the Web-based UtilitySetup Tab Internet SetupRFC 1483 Bridged Dynamic IP Static IPRFC 1483 Routed RFC 1483 RoutedRFC 2516 PPPoE RFC 2364 PPPoAOptional Settings required by some ISPs Bridged Mode OnlyNetwork Setup Configuring the Home Wireless-G Gateway Setup Tab DynDNS.org Ddns TabTZO.com Advanced Routing Tab Advanced Routing13 Routing Table Basic Wireless Settings Tab Wireless TabWireless Network Wireless Security Tab 15 Pre-Shared Key16 WEP Wireless Access Tab Wireless Network AccessAdvanced Wireless Settings Tab Advanced WirelessFirewall Security TabVPN Passthrough Additional FiltersBlock WAN Requests 22 Firewall LogAccess Restrictions Tab Internet Access Tab25 List of PCs Single Port Forwarding Tab Applications and Gaming TabSingle Port Forwarding Port Range Forwarding Tab 28 Port Range ForwardingPort Triggering Tab 29 Port TriggeringDMZ Tab 30 DMZQoS QoS TabApplication-based QoS Gateway Access Administration TabManagement Tab UPnP IGMP-ProxyReporting Reporting TabEmail Alerts Backup Configuration Diagnostics TabBackup&Restore Tab Restore ConfigurationFirmware Upgrade Tab Factory Defaults TabUpgrade from LAN Reboot Tab RebootGateway Information Status TabGateway Tab Internet ConnectionLocal Network Tab 42 Local Network45 Wireless DSL Status DSL Connection TabPVC Connection Common Problems and Solutions Appendix a TroubleshootingNeed to set a static IP address on a computer Want to test my Internet connection Home Wireless-G Gateway Home Wireless-G Gateway TCP UDP Can’t get the Internet game, server, or application to work Firmware upgrade failed, and/or the Power LED is flashing To start over, I need to set the Gateway to factory defaultNeed to upgrade the firmware My DSL service’s PPPoE is always disconnectingPower LED flashes continuously Is IPSec Passthrough supported by the Gateway? Frequently Asked QuestionsWhere is the Gateway installed on the network? Does the Gateway support IPX or AppleTalk?What is Network Address Translation and what is it used for? Does the Gateway support ICQ send file?What is DMZ Hosting? Is the Gateway cross-platform compatible? What are the advanced features of the Gateway?What is the Ieee 802.11g standard? How many ports can be simultaneously forwarded?What is infrastructure mode? What Ieee 802.11b and 802.11g features are supported?What is ad-hoc mode? What is roaming?What is DSSS? What is FHSS? And what are their differences? What is the ISM band?What is Spread Spectrum? What is WEP?How do I resolve issues with signal loss? How do I reset the Gateway?Have excellent signal strength, but I cannot see my network Security Precautions Appendix B Wireless SecuritySecurity Threats Facing Wireless Networks Appendix B Wireless Security Home Wireless-G Gateway Figure C-1 IP Configuration Screen Windows 98 or Me InstructionsWindows 2000 or XP Instructions Figure C-3 MAC Address/Physical AddressFigure D-1 Firmware Upgrade Appendix D Upgrading FirmwareAppendix E Glossary Home Wireless-G Gateway Home Wireless-G Gateway Home Wireless-G Gateway Home Wireless-G Gateway Home Wireless-G Gateway Home Wireless-G Gateway Appendix F Regulatory Information Radio EN 300 EMC EN 301 489-1, EN 301 Safety EN Belgium Applicable Power Levels in France Location Frequency Range MHz Power EirpWireless Adapters Open the Wireless Network Connection windowHome Wireless-G Gateway Appendix G Warranty Information Model Number HG200 Standards Appendix H SpecificationsLite, G.922.3, G.992.5, T1.413i2 Operating Humidity Europe Mail Address Appendix I Contact InformationOutside of Europe Mail Address