Linksys AG041 (EU) manual What is a VPN?, Dynamic IP Addresses

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ADSL Gateway with 4-Port Switch

Since you use the Gateway to share your 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 Gateway. 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 computers and print servers. These IP addresses are called “dynamic” because they are only temporarily assigned to the computer or device. After a certain time period, they expire and may change. If a computer 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

Computers and other network devices using dynamic IP addressing are assigned a new IP address by a DHCP server. The computer 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 computer on the network or another network device, such as the Gateway. By default, the Gateway’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 Gateway, see the DHCP section in “Chapter 5: Configuring the Gateway.”

What is a VPN?

A VPN, or Virtual Private Network, is a connection between two endpoints - a VPN Gateway, for instance - in different networks that allows private data to be sent securely over a shared or public network, such as the Internet. This establishes a private network that can send data securely between these two locations or networks.

This is done by creating a "tunnel". A VPN tunnel connects the two computers or networks and allows data to be transmitted over the Internet as if it were still within those networks. Not a literal tunnel, it is a connection secured by encrypting the data sent between the two networks.

VPN was created as a cost-effective alternative to using a private, dedicated, leased line for a private network. Using industry standard encryption and authentication techniques - IPSec, short for IP Security - the VPN creates a secure connection that, in effect, operates as if you were directly connected to your local network. Virtual Private Networking can be used to create secure networks linking a central office with branch offices,

Chapter 2: Planning your Network

dsl: an always-on broadband connection over traditional phone lines

ip address: the address used to identify a computer or device on a network

dynamic ip address: a temporary IP address assigned by a DHCP server

DHCP: a networking protocol that allows administrators to assign temporary IP addresses to network computers by "leasing" an IP address to a user for a limited amount of time, instead of assigning permanent IP addresses

server: any computer whose function in a network is to provide user access to files, printing, communications, and other services

VPN: a security measure to protect data as it leaves one network and goes to another over the Internet

encryption: encoding data transmitted in a network

IPSec: a VPN protocol used to implement secure exchange of packets at the IP layer

5

What is a VPN?

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Contents Adsl Gateway How to Use this Guide Copyright and TrademarksWord definition Table of Contents Adsl Gateway with 4-Port Switch List of Figures A Network with the Gateway23 Applications & Gaming Port Triggering Figure B-23 New Preshared Key Introduction WelcomeWhat’s in this Guide? Adsl Gateway with 4-Port Switch Planning your Network Gateway’s FunctionsIP Addresses What’s an IP Address?What is a VPN? Dhcp Dynamic Host Configuration Protocol ServersDynamic IP Addresses Encryption encoding data transmitted in a networkWhy do I need a VPN? VPN Gateway to VPN GatewayVPN Gateway-to-VPN Gateway Getting to Know the Adsl Gateway Back PanelFront Panel DSLConnecting the Adsl Gateway Connecting to a ComputerISP a company that provides access to the Internet OverviewConnect power Configuring the Adsl Gateway SetupAccess Restrictions SecurityHow to Access the Web-based Utility AdministrationApplications & Gaming StatusSetup Tab Basic SetupInternet Setup RFC 1483 Bridged Dynamic IP Static IPRFC 1483 Routed RFC 2516 PPPoEBridged Mode Only RFC 2364 PPPoAOptional Settings Required by some ISPs Network SetupDdns DynDNS.orgAdvanced Routing Advanced RoutingStatic Routing 12 Routing Table Security Tab FirewallVPN Software instructions for the computer15 VPN with Manual Key Management Advanced VPN Tunnel Setup PhaseConfiguring the Adsl Gateway Security Tab Access Restrictions Tab Internet Access19 List of PCs Applications and Gaming Tab Single Port ForwardingPort Range Forwarding Port TriggeringDMZ Administration Tab Gateway AccessManagement UPnP Reporting LogEmail Alerts Smtp the standard e-mail protocol on the InternetDiagnostics Factory DefaultsPing Test Ping Test Parameters Firmware Upgrade 29 Administration tab Firmware UpgradeStatus Tab GatewayGateway Information Internet ConnectionsLocal Network DSL ConnectionAppendix a Troubleshooting Common Problems and SolutionsNeed to set a static IP address on a computer Want to test my Internet connection Open a command prompt. For Windows 98 and Me Adsl Gateway with 4-Port Switch TCP UDP VPN Ipsec Can’t get the Internet game, server, or application to workTo start over, I need to set the Gateway to factory default Need to upgrade the firmwareFirmware upgrade failed, and/or the Power LED is flashing My DSL service’s PPPoE is always disconnecting Frequently Asked Questions Power LED flashes continuouslyWhere is the Gateway installed on the network? Is IPSec Passthrough supported by the Gateway?What is Network Address Translation and what is it used for? Does the Gateway support ICQ send file?What is DMZ Hosting? What are the advanced features of the Gateway? What is a MAC Address?How do I reset the Gateway? Is the Gateway cross-platform compatible?Introduction EnvironmentHow to Establish a Secure IPSec Tunnel Create an IPSec PolicyBuild Filter Lists Filter List 1 win-RouterFilter List 2 Router -win Figure B-4 IP Filter LIstFigure B-7 IP Filter List Configure Individual Tunnel Rules Tunnel 1 win-RouterFigure B-13 Authentication Methods Figure B-16 Tunnel Setting Tab Tunnel 2 Router-winFigure B-19 IP Filter List Tab Figure B-22 Preshared Key Assign New IPSec Policy Figure B-25 Connection TypeCreate a Tunnel Through the Web-Based Utility Figure B-28 VPN TabFigure C-1 IP Configuration Screen Windows 98 or Me InstructionsWindows 2000 or XP Instructions Figure C-3 MAC Address/Physical AddressFigure D-1 Upgrade Firmware Appendix D Upgrading FirmwareAppendix E Windows Help Shared ResourcesNetwork Neighborhood/My Network Places Appendix F Glossary Adsl Gateway with 4-Port Switch Adsl Gateway with 4-Port Switch Adsl Gateway with 4-Port Switch Appendix G Specifications StandardsAppendix H Warranty Information Limited WarrantyAppendix I Regulatory Information FCC StatementAppendix J Contact Information Europe Mail AddressOutside of Europe Mail Address