Linksys AG241 manual VPN Gateway-to-VPN Gateway

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ADSL2 Gateway with 4-Port Switch

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 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.

At this point, your data becomes open to hackers using a variety of methods to steal not only the data you are transmitting but also your network login and security data. Some of the most common methods are as follows:

1) MAC Address Spoofing

Packets transmitted over a network, either your local network or the Internet, are preceded by a packet header. These packet headers contain both the source and destination information for that packet to transmit efficiently. A hacker can use this information to spoof (or fake) a MAC address allowed on the network. With this spoofed MAC address, the hacker can also intercept information meant for another user.

2) Data Sniffing

Data “sniffing” is a method used by hackers to obtain network data as it travels through unsecured networks, such as the Internet. Tools for just this kind of activity, such as protocol analyzers and network diagnostic tools, are often built into operating systems and allow the data to be viewed in clear text.

3) Man in the Middle Attacks

Once the hacker has either sniffed or spoofed enough information, he can now perform a “man in the middle” attack. This attack is performed, when data is being transmitted from one network to another, by rerouting the data to a new destination. Even though the data is not received by its intended recipient, it appears that way to the person sending the data.

These are only a few of the methods hackers use and they are always developing more. Without the security of your VPN, your data is constantly open to such attacks as it travels over the Internet. Data travelling over the Internet will often pass through many different servers around the world before reaching its final destination. That's a long way to go for unsecured data and this is when a VPN serves its purpose.

Chapter 2: Planning Your Network

Figure 2-3: VPN Gateway-to-VPN Gateway

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Why do I need a VPN?

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Contents ADSL2 Gateway Copyright and Trademarks How to Use this GuideWord definition Table of Contents 2Computer-to-VPN Gateway Network21 Internet Policy Summary Figure B-11 Filter Acton Tab Welcome IntroductionWhat’s in this Guide? ADSL2 Gateway with 4-Port Switch Gateway’s Functions Planning Your NetworkIP Addresses What’s an IP Address?Dhcp Dynamic Host Configuration Protocol Servers What is a VPN?Dynamic IP Addresses VPN Gateway to VPN Gateway Why do I need a VPN?VPN Gateway-to-VPN Gateway Line Getting to Know the ADSL2 Gateway with 4- Port SwitchDSL Overview Connecting the ADSL2 Gateway with 4-Port SwitchConnection to a Computer Adsl Connection Setup Configuring the GatewayAccess Restrictions SecurityApplications & Gaming AdministrationStatus Setup Tab How to Access the Web-based UtilityBasic Setup Tab Internet SetupStatic IP RFC 1483 Bridged Dynamic IPRFC 2516 PPPoE IPoARFC 2364 PPPoA Bridged Mode OnlyNetwork Setup Optional Settings Required by some ISPsDynDNS.org Ddns TabTZO.com Advanced Routing Advanced Routing TabFirewall Security TabVPN 15 VPN Manual Advanced VPN Tunnel Setup19 Advanced VPN Tunnel Setup Internet Access Access Restrictions Tab22 List of PCs Single Port Forwarding Applications and Gaming TabPort Range Forwarding DMZ Port TriggeringApplication-based QoS Advanced QoSGateway Access Administration TabManagement UPnP ReportingEmail Alerts Backup&Restore DiagnosticsPing Test Firmware Upgrade Factory DefaultsUpgrade from LAN 36 Reboot RebootGateway Status TabGateway Information Internet Connections40 DSL Connection DSL ConnectionCommon Problems and Solutions Appendix a TroubleshootingNeed to set a static IP address on a computer Want to test my Internet connection ADSL2 Gateway with 4-Port Switch ADSL2 Gateway with 4-Port Switch TCP UDP Can’t get the Internet game, server, or application to work Need to upgrade the firmware To start over, I need to set the Gateway to factory defaultFirmware upgrade failed, and/or the Power LED is flashing My DSL service’s PPPoE is always disconnectingPower LED flashes continuously Where is the Gateway installed on the network? Frequently Asked QuestionsIs IPSec Passthrough supported by the Gateway? Does the Gateway support IPX or AppleTalk?Does the Gateway support ICQ send file? What are the advanced features of the Gateway? What is DMZ Hosting?Will the Gateway function in a Macintosh environment? Is the Gateway cross-platform compatible?How do I reset the Gateway? What is a MAC Address?How do I get mIRC to work with the Gateway? Can the Gateway act as my Dhcp server?WAG54G EnvironmentCreate an IPSec Policy How to Establish a Secure IPSec TunnelBuild Filter Lists Filter List 1 win-RouterFigure B-4 IP Filter LIst Filter List 2 Router -winFigure B-7 IP Filter List Tunnel 1 win-Router Configure Individual Tunnel RulesFigure B-13 Authentication Methods Tunnel 2 Router-win Figure B-16 Tunnel Setting TabFigure B-19 IP Filter List Tab Figure B-22 Preshared Key Figure B-25 Connection Type Assign New IPSec PolicyFigure B-28 VPN Tab Create a Tunnel Through the Web-Based UtilityWindows 98 or Me Instructions Figure C-1 IP Configuration ScreenFigure C-3 MAC Address/Physical Address Windows 2000 or XP InstructionsAppendix D Upgrading Firmware Figure D-1 Upgrade FirmwareAppendix E Glossary ADSL2 Gateway with 4-Port Switch ADSL2 Gateway with 4-Port Switch ADSL2 Gateway with 4-Port Switch ADSL2 Gateway with 4-Port Switch ADSL2 Gateway with 4-Port Switch Appendix F Specifications ADSL2 Gateway with 4-Port Switch FCC Statement Appendix G Regulatory InformationAppendix H Warranty Information Europe Mail Address Appendix I Contact InformationOutside of Europe Mail Address
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