Linksys BEFSX41 manual 133

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Instant Broadband® Series

e-mail address you're sending a note to. At the other end, the recipient can see the IP address of the Web page requestor or the e-mail sender and can respond by sending another message using the IP address it received.

IPSec (Internet Protocol Security) - A suite of protocols used to implement secure exchange of packets at the IP layer. IPSec supports two basic modes: Transport and Tunnel. Transport encrypts the payload of each packet, leaving the header untouched, while Tunnel mode encrypts both the header and the pay- load and is therefore more secure. IPSec must be supported on both transmit- ter and receiver and must share a public key. Tunnel mode is widely deployed in VPNs (Virtual Private Networks).

IPX (Internetwork Packet EXchange) - A NetWare communications protocol used to route messages from one node to another. IPX packets include network addresses and can be routed from one network to another.

ISP (Internet Service Provider) - A company that provides individuals and companies access to the Internet and other related services such as Web site building and virtual hosting.

LAN (Local Area Network) - A group of computers and associated devices that share a common communications line and typically share the resources of a single processor or server within a small geographic area (for example, within an office building).

MAC (Media Access Control) Address - A unique number assigned by the manufacturer to any Ethernet networking device, such as a network adapter, that allows the network to identify it at the hardware level.

Mbps (Megabits per second) - One million bits per second; unit of measure- ment for data transmission.

MD5 - A type of one-way authentication method that uses passwords. MD5 authentication is not as secure as the EAP-TLS or EAP/TTLS authentication methods.

MIB (Management Information Base) - A set of database objects. This set con- tains information about a specific device for utilizing SNMP.

mIRC - mIRC runs under Windows and provides a graphical interface for log- ging onto IRC servers and listing, joining and leaving channels.

EtherFast® Cable/DSL Firewall Router with 4-Port Switch/VPN Endpoint

Multicasting - Sending data to a group of nodes instead of a single destination.

NAT (Network Address Translation) - The translation of an Internet Protocol address (IP address) used within one network to a different IP address known within another network. One network is designated the inside network and the other is the outside.

NetBIOS - The native networking protocol in DOS and Windows networks. Although originally combined with its transport layer protocol (NetBEUI), NetBIOS today provides a programming interface for applications at the ses- sion layer (layer 5). NetBIOS can ride over NetBEUI, its native transport, which is not routable, or over TCP/IP and IPX/SPX, which are routable proto- cols.

NetBIOS computers are identified by a unique 15-character name, and Windows machines (NetBIOS machines) periodically broadcast their names over the network so that Network Neighborhood can catalog them. For TCP/IP networks, NetBIOS names are turned into IP addresses via manual configura- tion in an LMHOSTS file or a WINS server.

There are two NetBIOS modes. The Datagram mode is the fastest mode, but does not guarantee delivery. It uses a self-contained packet with send and receive name, usually limited to 512 bytes. If the recipient device is not listen- ing for messages, the datagram is lost. The Session mode establishes a connec- tion until broken. It guarantees delivery of messages up to 64KB long.

Network - A system that transmits any combination of voice, video and/or data between users.

Network Mask - Also known as the "Subnet Mask".

NNTP (Network News Transfer Protocol) - The protocol used to connect to Usenet groups on the Internet. Usenet newsreaders support the NNTP protocol.

Node - A network junction or connection point, typically a computer or work station.

Notebook (PC) - A notebook computer is a battery-powered personal comput- er generally smaller than a briefcase that can easily be transported and conve- niently used in temporary spaces such as on airplanes, in libraries, temporary offices, and at meetings. A notebook computer, sometimes called a laptop com- puter, typically weighs less than five pounds and is three inches or less in thick- ness.

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Contents User Guide Copyright & Trademarks Table of Contents Introduction FeaturesEnvironmental 139 An Introduction to LANs and WANs IP AddressesWhy Do I Need a VPN? Network Setup OverviewYour Virtual Private Network VPN What is a Virtual Private Network? Firewall Router to Firewall RouterModem connection will not work from any other port PowerRouter’s Back Panel PortsRouter’s Front Panel LEDs WAN and LAN LEDsProceed to Connect the Router Connect the Router Connecting Your Hardware Together and Booting UpRouter’s hardware installation is now complete OverviewConfigure the PCs Configuring Windows 95, 98, and Millennium PCsGo to Configure the Router Configuring Windows 2000 PCsConfiguring Windows XP PCs Configure the Router Advanced Proxies. Click Direct Connection to the Internet Obtain an IP Address AutomaticallyStatic IP Address Enter the Gateway AddressPPPoE RASQuick and Easy Router Administration Cable/DSL Firewall Router’s Web-based UtilitySetup User Name and Password Static IPWAN IP Firewall Multicast Pass Through Remote UpgradeBlock WAN Request IPSec Pass ThroughEstablishing a Tunnel VPNLocal Secure Group and Remote Secure Group Remote Security Gateway Encryption AuthenticationKey Management Instant Broadband Series Advanced Settings for Selected IPSec Tunnel PhaseOther Settings PasswordStatus Dhcp Log Help Advanced FiltersInstant Broadband Series Forwarding UPnP Forwarding Port Triggering Dynamic Routing Static RoutingDMZ Port DMZ HostDMZ Host Address Current DMZ Host MAC Address CloneDynDNS.org DdnsCommon Problems and Solutions Appendix a TroubleshootingTZO.com For Windows XP For Windows NTFor Windows 95, 98, and Me For Windows XP Am not able to access the Router’s web interface Setup Can’t get the Internet game, server, or application to work To start over, I need to set the Router to factory default Click the Advanced = Filter tab Need to use port triggeringFrequently Asked Questions TCP/IP is compatible with the Router Appendix B Maximizing VPN Security Windows 2000 or Windows XP IntroductionEnvironment Step One Create an IPSec PolicyStep Two Build Filter Lists Filter List 1 win-routerIP Address Filter List 2 router=win Figure C-6Step Three Configure Individual Tunnel Rules Tunnel 1 win-routerShared key, as shown Respond Using IPSec XYZ12345. ClickString to Protect Negotiate Security Key exchange pre AcceptTunnel 2 router-win Preshared key, Action Require Security This string to protectKey Exchange XYZ12345Figure C-24 Step Four Assign New IPSec PolicyStep Five Create a Tunnel Through the Web-based Utility Figure C-28Appendix E How to Ping Your ISP’s E-mail & Web Addresses Appendix D Snmp FunctionsFigure E-1 Appendix F Installing the TCP/IP Protocol TCP/IP installation is now completeFigure G-1 For Windows NT, 2000, and XPFigure G-5 Appendix H Glossary 129 131 133 135 137 Appendix I Specifications EnvironmentalSales Information Appendix J Warranty InformationAppendix K Contact Information Web FTP SiteCopyright 2003 Linksys, All Rights Reserved
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