Cisco Systems WRV54G manual Why do I need a VPN?, Dynamic IP Addresses

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Wireless-G VPN Broadband Router

If you use the Router to share your cable or DSL Internet connection, contact your ISP to find out if they have assigned a static IP address to your account. If so, you will need that static IP address when configuring the Router. You can get that information from your ISP.

Dynamic IP Addresses

A dynamic IP address is automatically assigned to a device on the network, such as PCs and print servers. These IP addresses are called “dynamic” because they are only temporarily assigned to the PC or device. After a certain time period, they expire and may change. If a PC logs onto the network (or the Internet) and its dynamic IP address has expired, the DHCP server will automatically assign it a new dynamic IP address.

DHCP (Dynamic Host Configuration Protocol) Servers

PCs and other network devices using dynamic IP addressing are assigned a new IP address by a DHCP server.

The PC or network device obtaining an IP address is called the DHCP client. DHCP frees you from having to assign

IP addresses manually every time a new user is added to your network.

A DHCP server can either be a designated PC on the network or another network device, such as the Router. By default, the Router’s DHCP Server function is enabled.

If you already have a DHCP server running on your network, you must disable one of the two DHCP servers. If you run more than one DHCP server on your network, you will experience network errors, such as conflicting IP addresses. To disable DHCP on the Router, see the DHCP section in “Chapter 6: The Router’s Web-based Utility.”

Why do I need a VPN?

Computer networking provides a flexibility not available when using an archaic, paper-based system. With this flexibility, however, comes an increased risk in security. This is why firewalls were first introduced. Firewalls help to protect data inside of a local network. But what do you do once information is sent outside of your local network, when emails are sent to their destination, or when you have to connect to your company's network when you are out on the road? How is your data protected?

That is when a VPN can help. VPNs are called Virtual Private Networks because they secure data moving outside of your network as if it were still within that network.

When data is sent out across the Internet from your computer, it is always open to attacks. You may already have a firewall, which will help protect data moving around or held within your network from being corrupted or intercepted by entities outside of your network, but once data moves outside of your network - when you send data to someone via email or communicate with an individual over the Internet - the firewall will no longer protect that data.

Chapter 2: Planning your Wireless Network

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Why do I need a VPN?

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Contents 802 GHz .11g Wireless- G How to Use this Guide Copyright and TrademarksWord definition Table of Contents Frequently Asked Questions Wireless SecurityWelcome Introduction What’s in this Guide? Wireless-G Broadband VPN Router Router’s Functions Planning your Wireless NetworkIP Addresses What’s an IP Address?Why do I need a VPN? Dhcp Dynamic Host Configuration Protocol ServersDynamic IP Addresses What is a VPN? VPN Router to VPN Router Wireless-G VPN Broadband Router Back Panel Getting to Know the Wireless-G VPN Broadband RouterDMZ Front PanelOverview Connecting the Wireless-G Broadband RouterWireless Connection to a PC Wired Connection to a PCWireless-G VPN Broadband Router Configuring Windows 98 and Millennium PCs Configuring the PCsProperties Configuring Windows 2000 PCsConfiguring Windows XP PCs Configuring the Router SetupWireless Administration Access RestrictionsSecurity Applications & GamingSetup Tab How to Access the Web-based UtilityBasic Setup Tab Internet SetupStatic Internet Connection Type Pptp Internet Connection Type Optional Settings Required by some ISPsNetwork Setup DynDNS.org Ddns TabAdvanced Routing Tab MAC Address Clone Tab See FigureMAC Clone Advanced Routing10 Routing Table Static RoutingWireless Tab Basic Wireless Settings See FigureWireless Network WEP See Figure Wireless Security13 Wireless Network Access Wireless Network Access See Figure15 Advanced Wireless Settings Advanced Wireless Settings See FigureFirewall Security TabVPN 18 Manual Key Management 19 Advanced VPN Tunnel Setup WEP Access Restriction Access Restrictions Tab23 Internet Filter Summary Port Range Forwarding Applications and Gaming Tab27 Port Triggering Port Triggering28 UPnP Forwarding UPnP ForwardingDMZ Administration Tab Router PasswordManagement UPnP LogEmail Alert Syslog NotificationNotification Queue Length DiagnosticsAlert Log General Log33 Factory Default Router StatusInformation WAN Connections36 Local Network Local NetworkSystem Performance 38 WirelessAppendix a Troubleshooting Common Problems and SolutionsNeed to set a static IP address on a PC Wireless-G VPN Broadband Router Wireless-G VPN Broadband Router Wireless-G VPN Broadband Router TCP UDP Can’t get the Internet game, server, or application to work To start over, I need to set the Router to factory default Need to upgrade the firmwareFirmware upgrade failed, and/or the Power LED is flashing Power LED flashes continuously My DSL service’s PPPoE is always disconnectingWhere is the Router installed on the network? Frequently Asked QuestionsIs IPSec Pass-Through supported by the Router? Does the Router support IPX or AppleTalk?Does the Router support ICQ send file? What is Network Address Translation and what is it used for?How can I block corrupted FTP downloads? What are the advanced features of the Router? What is DMZ Hosting?Is the Router cross-platform compatible? How many ports can be simultaneously forwarded?What Ieee 802.11b features are supported? What is the Ieee 802.11g standard?What is ad-hoc mode? What is infrastructure mode?What is Spread Spectrum? What is ISM band?What is DSSS? What is FHSS? And what are their differences? What is WEP?How do I reset the Router? How do I resolve issues with signal loss?Have excellent signal strength, but I cannot see my network Appendix B Wireless Security Brief OverviewWhat Are The Risks? Jamming Attacks Passive AttacksActive Attacks Maximizing Wireless SecurityDictionary-Building or Table Attacks Man-in-the-Middle Attacks5SSID 8WEP Wireless-G VPN Broadband Router Figure B-2 WEP 4GHz/802.11b and 802.11g WEP EncryptionWRV54G EnvironmentCreate an IPSec Policy How to Establish a Secure IPSec TunnelBuild Filter Lists Filter List 1 win-routerFigure C-4 IP Filter List Filter List 2 router-winFigure C-7 IP Filter List Tunnel 1 win-router Configure Individual Tunnel RulesFigure C-13 Authentication Methods Tunnel 2 router-win Figure C-16 Tunnel Setting TabFigure C-19 IP Filter List Tab Figure C-22 Preshared Key Figure C-25 Connection Type Assign New IPSec PolicyFigure C-28 VPN Tab Create a Tunnel Through the Web-Based UtilityWindows 98 or Me Instructions Figure D-1 IP Configuration ScreenFigure D-3 MAC Address/Physical Address Windows 2000 or XP InstructionsAppendix E Snmp Functions Appendix F Upgrading Firmware Figure F-1 Upgrade FirmwareAppendix G Windows Help Shared ResourcesNetwork Neighborhood/My Network Places Appendix H Glossary Wireless-G VPN Broadband Router Wireless-G VPN Broadband Router Wireless-G VPN Broadband Router Wireless-G VPN Broadband Router Wireless-G VPN Broadband Router Appendix I Specifications Transmit Power 19dBm LEDsUp to 54Mbps wireless, up to 100 Mbps LAN FCC Statement Appendix J Regulatory InformationFCC Part 68 Statement Safety Notices Limited Warranty Appendix K Warranty InformationAppendix L Contact Information
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