Milan Technology MIL-W0311 manual About Wireless LANs, Modes, Ad-hoc Mode, Infrastructure Mode

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Appendix B	B
About Wireless LANs

This Appendix provides some background information about using Wireless LANs (WLANs).

Modes

Wireless LANs can work in either of two (2) modes:

•Ad-hoc

•Infrastructure

Ad-hoc Mode

Ad-hoc mode does not require an Access Point or a wired (Ethernet) LAN. Wireless Sta- tions (e.g. notebook PCs with wireless cards) communicate directly with each other.

Infrastructure Mode

In Infrastructure Mode, one or more Access Points are used to connect Wireless Stations (e.g. Notebook PCs with wireless cards) to a wired (Ethernet) LAN. The Wireless Stations can then access all LAN resources.

Access Points can only function in "Infrastructure" mode, and can communicate only with Wireless Stations which are set to "Infrastructure" mode.

BSS/ESS

BSS

A group of Wireless Stations and a single Access Point, all using the same ID (SSID), form a Basic Service Set (BSS).

Using the same SSID is essential. Devices with different SSIDs are unable to communicate with each other.

ESS

A group of Wireless Stations, and multiple Access Points, all using the same ID (ESSID), form an Extended Service Set (ESS).

Different Access Points within an ESS can use different Channels. In fact, to reduce interfer- ence, it is recommended that adjacent Access Points SHOULD use different channels.

As Wireless Stations are physically moved through the area covered by an ESS, they will automatically change to the Access Point which has the least interference or best performance. This capability is called Roaming. (Access Points do not have or require Roaming capabili- ties.)

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Contents ShAir Office Table of Contents URL Filter Virtual Servers Access Control Wireless LAN ConfigurationAT Commands Standard AT Commands Wireless Gateway Pcmcia Wireless Card MIL-W1311 onlyLAN Features Wireless Gateway FeaturesIntroduction Wireless Features Internet Access FeaturesNetwork Printer Advanced Internet Functions RAS Remote Access ServicesConfiguration & Management Security FeaturesPhysical Details Package ContentsRear Panel Rear PanelPcmcia slot Reset ButtonTo Clear All Data and restore the factory default values Power portRestore Default IP Address and Clear Password DIP SwitchesDIP Switch Setting Description Requirements InstallationProcedure Choose an Installation SiteConnect WAN Cable Insert Wireless Pcmcia cardPower Up Connect LAN CableOverview ConfigurationTo Do this Refer to If you cant connect Configuration ProgramConnecting to the Wireless Gateway PreparationNavigation & Data Input PasswordQuick Setup Overview Quick Setup ScreenRouter Configuration Data Quick Setup ScreenWireless Save CancelWEP Status ButtonsData Wireless Screen Wireless ScreenConfiguration WEP Data Privacy Wireless Station AccessNew station Access For Wireless Stations listed above PermissionFor Other Wireless Stations Existing StationsPhysical Address Status ScreenData Status Screen Device NameWAN Links SystemInternet Access Log Access Control LogData WAN Status Direct ConnectionWAN Status Status Data WAN Status PPPoEConnection Log Clear Log Connection Log MessagesConnect DisconnectWindows Clients PC ConfigurationTCP/IP Settings To check your PCs TCP/IP SettingsUsing Specify an IP Address Using DhcpGateway Tab Win 95/98 Accessing AOL Internet AccessPrint Port Driver Setup Printing SetupPort Options ManagementRetry Windows NT 4.0 Server ConfigurationLPD/LPR Printing BannerAdding the Printer Windows 2000 Server ConfigurationWindows 2000 Select Port Client PC Setup for LPD/LPR PrintingCreating a Dial-in Connection in Windows Dial-in ConfigurationDial-up Networking Properties Using the Dial-in ConnectionMacintosh Clients Installing the PrinterPrinting To act as a Dhcp Client recommended Internet Access on LinuxLinux Clients LPD Printing on LinuxLPD Printing Wireless Station ConfigurationFor Internet Access via the Wireless Gateway Other Unix SystemsUsing another Dhcp Server Using the Wireless Gateways Dhcp ServerWhat Dhcp Does To Configure your PCs to use Dhcp Serial Port Screen Serial PortData Serial Port Screen Internet AccessModem Links Dial-InOther Properties Modem Properties ScreenData Modem Properties Screen Initial StringOther Save asDial -in Users Controlling Dial-in AccessOverview Other Users Dial-in Users ScreenData Dial-in Users Screen Existing UsersData User Details Screen User Details ScreenUser ID Call back Enable dial-in accessEnforce connection Time limitStatus Serial Port StatusOverview Data Serial Port Status ScreenLog Connection LogSerial Port When prompted for the password, leave the User Name blank PasswordOptions To connect from a remote PC via the Internet DNS Domain Name ServerNAT Network Address Translation Remote ManagementAppleTalk Routing TablePrinter Port Data Printer Port ScreenPrinter Status Logical PrintersStatic Routing Table Using this ScreenRouting Routing ScreenStatic Routing Table Data Routing ScreenOther Routers on the Local LAN Router ConfigurationUpdate Local RouterStatic Routing Example For the Wireless Gateways Routing TableFor Router As Default Route For Router Bs Default RouteAdvanced Internet Screen Advanced InternetAt any time, only one 1 PC can use each Special Application Using a Special ApplicationSpecial Internet Applications Special Applications ScreenDetails Data Special Applications ScreenManaging Special Application Entries Select EntryIncoming Operation URL FilterTips Data URL Filter Screen URL Filter ScreenSite List IP Address seen by Internet Users Virtual ServersTypes of Virtual Servers Virtual Servers Virtual Server ScreenData Virtual Server Screen WAN IP AddressLAN IP Address User Defined Virtual ServersData- User Defined Virtual Servers Screen Managing User Defined Virtual ServersSelect Server Number Connecting to the Virtual ServersInternal Port Number External PortLAN IP Address EnableDMZ Screen Data DMZ ScreenWAN IP Address Access Control Log Access ControlTo use this feature Operations Security Groups ScreenData Security Groups Screen Access Rights Internet Access for this GroupPacket Filter Table Data PCs Screen PCs ScreenSelect PC Security Group Network AdapterReserve entry ReservedPort No Filters ScreenData Filters Screen TCP FiltersGeneral Problems TroubleshootingInternet Access Problem 1 My PC cant locate the Wireless Access Point Wireless AccessProblem 2 Wireless connection speed is very slow Printing To remove an existing printer port installationWireless Gateway User Guide Appendix a Troubleshooting Check the Modem Dial-in AccessCheck the Remote PC Appendix a Troubleshooting Modes About Wireless LANsAd-hoc Mode Infrastructure ModeChannels WEP AuthenticationWireless LAN Configuration Access ControlSetting AT Command AT CommandsAT Commands Required SettingsConnection Properties W95/98 Command Description Standard AT CommandsATO Extended AT& Commands Wireless Gateway SpecificationsPcmcia Wireless Card MIL-W1311 only