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Rev 3.0B Feb.08 70
7
7: IP Manager
• Understanding Domain
Names
• Using IP Manager with
your Raven
• Understanding DNS
IfyouhaveafleetofSierraWirelessAirLinkmodemsoreven
ifyouonlyhaveone,itcanbedifficulttokeeptrackofthe
currentIPaddresses,especiallyiftheaddressesaren’tstatic
butchangeeverytimethemodemsconnecttoProvider.Ifyou
needtoconnecttoa
modem,orthedevicebehindit,itisso
mucheasierwhenyouhaveadomainname
(car54.mydomain.com,whereareyou?).
Reasons to contact the modem and/or the connected
device:
• Requestingalocationupdatefromadeliverytruck.
• Contactingasurveillancecameratodownloadlogsor
surveyaspecificarea.
• Anoilderekthatneedstobetriggeredtobeginpumping.
• Sendingtexttobedisplayedbyaroadsign.
• Updatingthesongstobeplayedonajukebox.
• Updatingadvertisementstobedisplayedinacab.
• Remoteaccesstoacom puter,aPLC,anRTU,orother
system.
• Monitoringandtroubleshootingthestatusofthemodem
itselfwithoutneedingtobringitinorgoouttoit.
AdynamicIPaddressissuitablefor manyInternetactivities
suchaswebbrowsing,lookingupdataonanothercomputer
system,dataonlybeingsentout,ordataonlybeingreceived
afteraninitialrequest(alsocalledMobileOriginated).
However,ifyouneedtocontactRavendirectly,adevice
connectedto
themodem,orahostsystemusingyourRaven
(alsocalledMobileTerminated),adynamicIPwon’tgiveyoua
reliableaddresstocontact(sinceitmayhavechangedsincethe
lasttimeitwasassigned).
DomainnamesareoftenonlyconnectedtostaticIPaddresses
becauseofthewaymostdomainname(DNS)serversareset‐
up.DynamicDNSserversrequirenotificationofIPAddress
changessotheycanupdatetheirDNSrecordsandlinka
dynamicIPaddresstothecorrectname.