Linksys BEFW11S4 manual 102

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Instant Wireless® Series

Router - Protocol-dependent device that connects subnetworks together. Routers are useful in breaking down a very large network into smaller subnet- works; they introduce longer delays and typically have much lower throughput rates than bridges.

RTS (Request To Send) - An RS-232 signal sent from the transmitting station to the receiving station requesting permission to transmit.

Server - Any computer whose function in a network is to provide user access to files, printing, communications, and other services.

SMTP (Simple Mail Transfer Protocol) - The standard e-mail protocol on the Internet. It is a TCP/IP protocol that defines the message format and the mes- sage transfer agent (MTA), which stores and forwards the mail.

SNMP (Simple Network Management Protocol) - A widely used network monitoring and control protocol. Data is passed from SNMP agents, which are hardware and/or software processes reporting activity in each network device (hub, router, bridge, etc.) to the workstation console used to oversee the net- work. The agents return information contained in a MIB (Management Information Base), which is a data structure that defines what is obtainable from the device and what can be controlled (turned off, on, etc.).

Software - Instructions for the computer. A series of instructions that performs a particular task is called a "program." The two major categories of software are "system software" and "application software." System software is made up of control programs such as the operating system and database management sys- tem (DBMS). Application software is any program that processes data for the user.

A common misconception is that software is data. It is not. Software tells the hardware how to process the data.

Spread Spectrum - Spread Spectrum technology is a wideband radio frequen- cy technique developed by the military for use in reliable, secure, mission-crit- ical communications systems. It is designed to trade off bandwidth efficiency for reliability, integrity, and security. In other words, more bandwidth is con- sumed than in the case of narrowband transmission, but the trade off produces a signal that is, in effect, louder and thus easier to detect, provided that the receiver knows the parameters of the spread-spectrum signal being broadcast.

Wireless Access Point Router with 4-Port Switch

If a receiver is not tuned to the right frequency, a spread-spectrum signal looks like background noise. There are two main alternatives, Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS).

SPI (Stateful Packet Inspection) - A firewall technology that monitors the state of the transaction so that it can verify that the destination of an inbound pack- et matches the source of a previous outbound request. It examines not just the headers of the packet, but also the contents, to determine more about the pack- et than just its source and destination information. It is called "stateful" because verifies that the stated destination computer has previously requested the cur- rent communication. In this way, it verifies that all communications are initiat- ed by the recipient computer and are taking place only with sources that are known and trusted from previous interactions. In addition to being a more rig- orous inspection, stateful packet inspection closes off ports until connection to the specific port is requested. This allows an added layer of protection from the threat of port scanning.

SSID (Service Set IDentifier) - A unique name shared among all points in a wireless network. The SSID must be identical for each point in the wireless net- work and is case-sensitive.

Static IP Address - A permanent IP address that is assigned to a node in an IP or a TCP/IP network.

Static Routing - Forwarding data in a network via a fixed path. Static routing cannot adjust to changing line conditions as can dynamic routing.

Subnet Mask - The method used for splitting IP networks into a series of sub- groups, or subnets. The mask is a binary pattern that is matched up with the IP address to turn part of the host ID address field into a field for subnets.

Switch - 1. A data switch connects computing devices to host computers, allowing a large number of devices to share a limited number of ports. 2. A device for making, breaking, or changing the connections in an electrical cir- cuit.

TCP (Transmission Control Protocol) - A method (protocol) used along with the IP (Internet Protocol) to send data in the form of message units (datagram) between network devices over a LAN or WAN. While IP takes care of handling the actual delivery of the data (routing), TCP takes care of keeping track of the individual units of data (called packets) that a message is divided into for effi-

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Contents Wireless Access Point Router With 4-Port Switch Copyright & Trademarks Industry Canada Canada Table of Contents Minimum Requirements Linksys Wireless Access Point Router with 4-Port SwitchFeatures IntroductionStatic IP Addresses Dhcp Dynamic Host Configuration Protocol ServersIP Addresses What’s an IP Address?Ports Wireless Access Point Router’s PortsPower Wireless Access Point Router’s LEDsBefore You Start Connecting the RouterWAN Indicators Connecting Your Hardware Together and Booting UpInstant Wireless Series Configuring Windows 95, 98, and Millennium PCs Configuring the PCsOverview Configuring Windows 2000 PCs Configuring Windows XP PCs A b l e / D i s a b l e Configuring the RouterPPPoE Obtain an IP AutomaticallyStatic IP AddressPptp Using the Router’s Web- Based UtilitySetup Static IP Status PasswordDhcp Log AOL Parental Controls SecurityFilters HelpAdvanced Tab Filters Setting Up FiltersEditing MAC Filter Setting Using Multicast Pass ThroughUsing Remote Upgrade Using IPSec Pass ThroughUsing Pptp Pass Through Using Remote ManagementAdvanced Tab Port Range Forwarding UPnP ForwardingInstant Wireless Series Advanced Tab Dynamic Routing Port TriggeringAdvanced Tab Static Routing Advanced Tab MAC Address Cloning Advanced Tab DMZ HostAdvanced Tab Wireless Common Problems and Solutions Appendix a TroubleshootingNeed to set a static IP address on a PC For Windows 95, 98, and Me For Windows NTFor Windows XP Want to test my Internet connectionFor Windows XP Need to set up a server behind my Router Am not able to access the Router’s web interface SetupCan’t get the Internet game, server, or application to work My DSL service’s PPPoE is always disconnecting To start over, I need to set the Router to factory defaultNeed to upgrade the firmware Firmware upgrade failed, and/or the Diag LED is flashingFull/Col LED keeps flickering continuously Click the Advanced = Filter tabNeed to use port triggering Diag LED stays lit continuouslyFrequently Asked Questions Allows Pptp packets to pass through Instant Wireless Series Step One Pinging an IP Address Appendix B How to Ping Your ISP’s E-mail and Web AddressesStep Two Pinging for a Web Address Appendix C Configuring Wireless Security Figure C-2 Figure C-3 Configuring Wireless Security in Windows XPFigure C-6 Figure C-10 For Windows NT, 2000, and XP Figure D-3Http//192.168.1.1 in the web Figure D-6AOL Broadband via DSL Figure E-3Appendix F Glossary Instant Wireless Series Instant Wireless Series Instant Wireless Series 100 102 104 Environmental Appendix G SpecificationsAppendix I Contact Information Appendix H Warranty InformationWeb site FTP site Copyright 2003 Linksys, All Rights Reserved
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