Sierra Wireless RAVEN 20070914 User Manual Page 70

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Rev 3.0B Feb.08 65
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.
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