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Chapter 3. Network Preferences for Mobile Computing

Chapter 3. Network Preferences for Mobile Computing

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YourNetworkSettings

YourMaclaptopcanconnecttotheInternetinseveraldifferent

ways.ItdependsonthetypeofInternetconnectionavailable

andwhetherornotyourlaptophasBluetoothorAirPort

installed.

ToopenyourNetworksettings,clicktheSystem

PreferencesiconintheDock(below-left).Thenclickthe

"Network"icon(below-right).



[Viewfullsizeimage]



TheNetworkStatusPane

Toseethecurrentconnectionpossibilities,fromthe

"Show"pop-upmenu,makesure"NetworkStatus"isselected

(itprobablyis).Thepossibleconnectionsyoumightseeinthe

NetworkStatuspanearelistedbelow.Ifyourlaptopdoesn't

haveBluetoothorAirPortinstalled,youwon'tseethoseoptions.



Built-inEthernet.YoucanuseanEthernetcableto

connectyourlaptoptoabroadbandconnection,suchasa

DSLorcablemodem.YoucanalsouseanEthernetcableto

connecttotheEthernetportofawirelessbasestation,such

asApple'sAirPortBaseStation.Seepage29.

AirPort.IfyourlaptophasanAirPortcardinstalled,you

canwirelesslyconnecttoanAppleAirPortBaseStation.You

canalsoconnecttoanywirelessaccesspointthattransmits

aWi-Fisignal(Wi-Fihotspotsareavailableatmany

locationsaroundtheworld).Seepages3031.

InternalModem.Theinternalmodemportusesan

ordinarytelephonecable(RJ-11)toconnecttoaphone

outlet.Internalmodemsarenotcapableoffastspeeds,but

they'realotfasterthannoconnectionatall.(Ifyouwantto

sendafax,youhavetousetheinternalmodemand

connectaphoneline,evenifyouhaveaccesstoa

broadbandconnection.)Seepages3235.

Bluetooth.Bluetoothisawirelesstechnologydesignedfor

shortdistances(upto33feet)andslowspeeds(1Mbps).If

youhaveBluetoothinstalledonyourlaptop,andifyour

mobilephoneisBluetooth-enabled,andifyourmobile

phoneserviceplanincludesInternetaccess,youcan

connecttotheInternetwithyourmobilephone;thephone

communicatesviaBluetoothwithyourlaptop.Thisisanifty

waytoconnecttotheInternetwhenyou'reonthego,but

stillwithinrangeofyourwirelesstelephonenetwork.See

pages31and4749fordetailsabouthowtogetconnected

toyourBluetoothphone.

NetworkPortConfigurations.Thisisthepanewhereyou

canturndifferentconnectionmethodsonoroff,plus

arrangetheorderinwhichyouwantyourMactotryto

connect.Seepage28.



Tip:

Nomatterhowyouconnect,makesureyouread

page28abouttheNetworkPortConfigurations.



IntheNetworkstatuspane,youseetotheleftofeach

connectionasmall,coloreddot.Thecolorofthedotindicates

theconnectionstatusviathatparticularmethod:

Greendot.Theconnectionisactive.

Reddot.Theconnectionisoff.

Yellowdot.Thedeviceison,butisnotconnectedtothe

Internet.

Clickthe"Show"pop-upmenu(showntotheright)to

chooseanycurrentconnectionoptionandshowthe

settingsforthatconnection,asshownonthefollowing

pages.OrclickoneoftheconnectionsintheNetwork

Statuspanetohighlightit,thenclickthe"Configure..."

buttonbelowtoseethesettingsforthatconnection.



[Viewfullsizeimage]



TheNetworkPortConfigurationspane

Thelastiteminthe"Show"pop-upmenuis"NetworkPort

Configurations,"butwe'retalkingaboutitfirstbecauseit's

quiteimporant.Inthispaneyoudeterminewhichnetworkand

InternetconnectionoptionsyouwanttheMactouseandin

whichorder.



Morethanoneconfigurationcanbeturnedonatthesametime.

Whywouldyouneedmorethanone?Well,youmightbe

connectedthroughanEthernetlocalareanetworktoother

computersinyourhomeandoffice,plusyoumighthavethe

onlyAirPortcardinyouroffice,andperhapsyouhaveaphone

withanoccasionalBluetoothconnection.



Whenyourcomputerattemptstoconnecttoanetworkorthe

Internet,itfirsttriesthetopiteminthelistofconfigurations

thatyouhavechecked,asshownbelow.Ifthatconnection

doesn'tsucceed,itgoestothenextiteminthelist.

Therearetwomainreasonstobeawareofthispane.

One,youneedtochecktheoptionsyouwanttouseorthey

won'tshowupintheStatuspane.Two,ifyou'rehavingtrouble

connecting,thefirsttroubleshootingtechniqueistomakesure

yourdesiredconnectionisatthetopofthelist.



[Viewfullsizeimage]



Tomakeaconfigurationactive,clickthecheckboxtoputa

checkinit.Thenclickthe"ApplyNow"button.

Torearrangethepriorityofconfigurations,dragtheitems

inthelistintotheorderyouwantyourMactotrytoconnect

(justpressonthenameanddragitupordown;you'llseea

blacklinethatindicateswhereitwillbeplacedwhenyoulet

go).Forinstance,athomeyoumightconnectyourlaptop

throughanEthernetbroadbandconnection,butatthecoffee

shopyouconnecttothewirelessservice.Atdifferenttimes,you

mightwantyourMactofirsttrytoconnectthroughoneorthe



other.



Note

The"Built-inFireWire"optionenablesyouto

networktoanothercomputerviaaFireWirecable.



AlternateOptionsforNewConfigurations

Thereareextraoptionshiddeninthe"New..."pop-upmenu

(shownbelow).Youprobablywon'teverneedtousethese,but

ifyou'reonacorporatenetwork,yoursystemadministrator

mightadviseyoutousethem.

6to4.The"6to4"optionenablesconnectionsbetween

computersusingIPV4(whichcurrentlyincludesmost

everyone)andcomputersusingIPV6(uncommonnow,but

comingsoon).IPV6isanewversionofInternetProtocol

thatprovidesmoreIPaddressesforInternetusersthan

IPV4,thecurrentstandard.AlthoughIPV6isnotavailable

tomostofusyet,lookforitinthenearfutureasIPV4runs

outofavailableIPnumbersfornewInternetaddresses.

LinkAggregate.ThisoptionletsyoumergetwoEthernet

portsintoonevirtualport,providingincreasedbandwidth.



FYI

IPv4cansupportabout4billionInternetaddresses.

IPv6(alsoknownasIPngInternetProtocolnext

generation)cansupportabout3.4duodecillion



Internetaddresses.

3.4duodecillion=

34trilliontrilliontrillion.



[Viewfullsizeimage]



NetworkConfigurationforBuilt-inEthernet

Connections

ToadjustthesettingsforaBuilt-inEthernetconfiguration,

makesureitischeckedonintheNetworkPortConfigurations,

asexplainedonpage28.Theneitherchoose"Built-InEthernet"

fromtheShowmenu(shownbelow),orifyouseeitinthe

Statuspane,selectitandclickthe"Configure..."button(as

shownonpage27).

TCP/IP.TheexamplebelowshowstheTCP/IPpane.In

mostsituations,youwanttochoose"UsingDHCP"from

the"ConfigureIPV4"pop-upmenu.DHCPautomatically



allocatesanIPaddresstoyourcomputer.Mostuserscan

ignoretherestofthispage.



TCP/IP

TransmissionControlProtocol/InternetProtocol:

Asetofprotocols(procedures)thatenable

computerstocommunicatewitheachother,

evenifthey'renotonthesamenetwork.



DHCP

DynamicHostConfigurationProtocol:Aprotocol

thatdynamically(onthefly)allocatesIP

(InternetProtocol)addressestocomputersona

network.



PPPoE.Thisoption(Point-to-PointProtocoloverEthernet)

combinesdialupconnections(ppp)withEthernettosupport

multipleusersinalocalareanetwork.Youmightfindthis

typeofconnectioninalargeofficebuildingorapartment

complexwheremanyusersshareabroadbandconnection

andarebilledseparately.Toconnecttoanetworkthatuses

PPPOE,clickthetabandenteryouraccountinformation.

AppleTalk.ToprinttoaPostScriptprinter,youneedto

checktheboxto"MakeAppleTalkActive"intheAppleTalk

pane.



Proxies.The"Proxies"buttonletsyouconfigureProxy

Serversifyou'reonalargenetwork.Checkwithyour

networkadministratorforsettingswhenafirewallorother

securitymeasurehasbeensetup.



[Viewfullsizeimage]



NetworkConfigurationforBluetooth

Connections

Bluetoothisashort-range(usuallyabout33feetmaximum)

wirelessnetworktechnology.IfyourlaptopisBluetoothenabled,youcanuseconnectittoanotherBluetoothdevice,

suchasaphone,printer,keyboard,mouse,headset,or

handheldPDA.IfBluetoothisn'tbuiltintoyourcomputer,you

canbuyanadapter(showntotheright)andplugitintoaUSB

port.



FYI

BluetoothtechnologyisnamedinhonorofKing

HaraldBlåtand(Bluetooth)(940986A.D.),aViking

creditedwithunitingDenmarkandNorwayand

beingapositiveinfluenceonScandinavia.Ericsson,



aScandinaviancompanyresponsiblefordeveloping

thisshort-range,low-power,wirelesstechnology,

payshomagetoHaraldwiththenameBluetooth.

Withstandardization,Ericssonaimstounitethefield

ofwirelesstechnologymuchasHaraldBluetooth

unitedScandinavia.

KingHaralddidn'thaveabluetooth.Thename

originatedfromanoldVikingwordthatmeant"dark

complexion"(Haraldhadverydarkhair,unusualfor

aViking),andtheoriginalnamehasbeen

pronounced"Bluetooth"forhundredsofyears.

TheBluetoothcompanylogo(andtheiconinyour

menubar)isderivedfromancientrunesforHarald's

initials.



SetUpaBluetoothMobilePhone



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