Linksys WRT51AB manual 113

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Instant Wireless® Series

DMZ - (DeMilitarized Zone) allows one IP address (or computer) to be exposed to the Internet. Some applications require multiple TCP/IP ports to be open. It is recommended that you set your computer with a static IP address if you want to use DMZ Hosting.

DNS - The Domain Name System (DNS) is the way that Internet domain names are located and translated into Internet Protocol (IP) addresses. A domain name is a meaningful and easy-to-remember “handle” for an Internet address.

Domain - A subnetwork comprised of a group of clients and servers under the control of one security database. Dividing LANs into domains improves per- formance and security.

Download - To receive a file transmitted over a network. In a communications session, download means receive, and upload means transmit.

Driver - A workstation or server software module that provides an interface between a network interface card and the upper-layer protocol software running in the computer; it is designed for a specific NIC, and is installed during the initial installation of a network-compatible client or server operating system.

DSSS (Direct-Sequence Spread Spectrum) - DSSS generates a redundant bit pattern for all transmitted data. This bit pattern is called a chip (or chipping code). Even if one or more bits in the chip are damaged during transmission, statistical techniques embedded in the receiver can recover the original data without the need for retransmission. To an unintended receiver, DSSS appears as low power wideband noise and is rejected (ignored) by most narrowband receivers. However, to an intended receiver (i.e. another wireless LAN end- point), the DSSS signal is recognized as the only valid signal, and interference is inherently rejected (ignored).

DTIM (Delivery Traffic Indication Message) - A DTIM field is a countdown field informing clients of the next window for listening to broadcast and mul- ticast messages. When the AP has buffered broadcast or multicast messages for associated clients, it sends the next DTIM with a DTIM Interval value. AP Clients hear the beacons and awaken to receive the broadcast and multicast messages.

Dynamic IP Address - An IP address that is automatically assigned to a client station in a TCP/IP network, typically by a DHCP server. Network devices that serve multiple users, such as servers and printers, are usually assigned static IP addresses.

Dual-Band Wireless A+B Broadband Router

Dynamic Routing - The ability for a router to forward data via a different route based on the current conditions of the communications circuits. For example, it can adjust for overloaded traffic or failing lines and is much more flexible than static routing, which uses a fixed forwarding path.

EAP (Extensible Authentication Protocol) - An IETF standard that establishes an authentication protocol for network access. Many authentication methods, including passwords, certificates, and smart cards, work within this framework.

EAP-TLS- One type of mutual authentication method using the Extensible Authentication Protocol (EAP) and a security protocol called the Transport Layer Security (TLS). EAP-TLS uses digital certificates and is more secure than MD5 authentication, which uses passwords. EAP-TLS authentication sup- ports dynamic WEP key management.

EAP-TTLS- One type of mutual authentication method using the Extensible Authentication Protocol (EAP) and Tunneled Transport Layer Security (TTLS). EAP-TTLS uses a combination of certificates and another method, such as passwords. It is more secure than MD5 authentication, which uses passwords, and less secure than EAP-TLS authentication, which exclusively uses certifi- cates. EAP-TTLS authentication supports dynamic WEP key management.

Encryption - A security method that applies a specific algorithm to data in order to alter the data’s appearance and prevent other devices from reading the information.

Ethernet - IEEE standard network protocol that specifies how data is placed on and retrieved from a common transmission medium. Has a transfer rate of 10 Mbps. Forms the underlying transport vehicle used by several upper-level protocols, including TCP/IP and XNS.

Fast Ethernet - A 100 Mbps technology based on the 10Base-T Ethernet CSMA/CD network access method.

FHSS (Frequency Hopping Spread Spectrum) - FHSS continuously changes (hops) the carrier frequency of a conventional carrier several times per second according to a pseudo-random set of channels. Because a fixed frequency is not used, and only the transmitter and receiver know the hop patterns, interception of FHSS is extremely difficult.

Firewall - A firewall is a set of related programs, located at a network gateway server, that protects the resources of a network from users from other networks.

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Contents Dual-Band Wireless A+B Broadband Router Copyright & Trademarks Table of Contents Common Problems and Solutions Frequently Asked Questions IntroductionEnvironmental 127 Features Router’s FunctionsIP Addresses What’s an IP Address?Dhcp Dynamic Host Configuration Protocol Servers Router Setup OverviewDynamic IP Addresses Getting to Know the Dual-Band Wireless A+B Broadband Router Router’s Back PanelRouter’s Front Panel LEDs LAN Indicators Internet IndicatorsProceed to Connect the Router Wired Connection to a PC Connect the RouterOverview Configure the PCs Wireless Connection to a PCConfiguring Windows 98 and Millennium PCs Go to Configure the Router’s Basic SettingsConfiguring Windows 2000 PCs Configuring Windows XP PCs Configure the Router’s Basic Settings Automatic Configuration Dhcp Enter the Default GatewayStatic or Fixed IP Address Enter the Internet IP AddressHow to Access the Web-based Utility Router’s Web-based UtilityAutomatic Configuration Dhcp SetupStatic IP Pptp 5GHz, 802.11a 5GHz, 802.11a WEP 4GHz, 802.11b WEP Password StatusLAN Dhcp Log HelpAdvanced Tabs Advanced Wireless 5GHz, 802.11a802.1x Configuration Radius Server Filters Private MAC Filter To set up a filter Private IP Filter11-20 , 21-30 , 31-40 , or 41-50 from Applications External Port TCP Protocol UDP Protocol Port ForwardingRouting Click the Delete This Entry buttonDMZ Host MAC Address Clone Appendix a Troubleshooting Common Problems and SolutionsNeed to set a static IP address on a PC For Windows NTFor Windows XP Want to test my Internet connectionFor Windows 98, Me, 2000, and XP Need to set up a server behind my Router TCP UDPCan’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 Diag LED is flashing My DSL service’s PPPoE is always disconnectingFrequently Asked Questions Click the Advanced = Filters tabDoes the Router support ICQ send file? How can I block corrupted FTP downloads?What is DMZ Hosting? What are the advanced features of the Router?What is the Ieee 802.11a standard? What is the Ieee 802.11b standard?What Ieee 802.11b features are supported? What is ad-hoc mode?What is infrastructure mode? What is roaming?What is WEP? What is a MAC Address?How do I reset the Router? How do I resolve issues with signal loss?Appendix B How to Ping Your ISP’s E-mail & Web Addresses Step One Pinging an IP AddressAppendix C Configuring Wireless Security Step Two Pinging for a Web AddressBackground 802.1x Authentication WEP EncryptionMD5 Authentication for Windows XP Figure C-2Figure C-5 Digital Certificate Installation Figure C-9Click Install this certificate Figure C-13TLS Authentication for Windows XP Figure C-18Figure C-21 Figure C-25 For Windows 95, 98, and MeFigure D-3 For Windows NT, 2000, and XPAppendix E Glossary 111 113 115 117 119 121 123 125 Appendix F Specifications One 10/100 RJ-45 Port for Cable/DSL ModemCategory 5 Ethernet Network Cable or better EnvironmentalAppendix G Warranty Information Sales Information Technical Support RMA Issues FaxAppendix H Contact Information Web site FTP siteCopyright 2002 Linksys, All Rights Reserved
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