AirLink Communications Raven X HSDPA Betriebsanweisung Seite 77

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Seitenansicht 76
Rev 2.0 Jul.09 70
9
9: IP Manager
Understanding Domain
Names
Using IP Manager with
your Raven XE
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.
Updatingadve rtisementstobedisplayedinacab.
Remoteaccesstoacom puter,aPLC,anRTU,orother
system.
Monitoringandtroubleshootingthestatusofthemodem
itselfwithoutneedingtobringitinorgoouttoit.
AdynamicIPaddressissuitablefor manyInternetactivities
suchaswebbrowsing,lookingupdataonanothercomputer
system,dataonlybeingsentout,ordataonlybeingreceived
afteraninitialrequest(alsocalledMobileOriginated).
However,ifyouneedtocontactRavenXEdirectly,ade vice
connected
tothemodem,orahostsystemusingyourRaven
XE(alsocalledMobileTerminated),adynamicIPwon’tgive
youareliableaddresstocontact(sinceitmayhavechanged
sincethelasttimeitwasassigned).
DomainnamesareoftenonlyconnectedtostaticIPaddresses
becauseofthewaymostdomainname(DNS)serversareset
up.DynamicDNSservers requirenotificationofIPAddress
changessotheycanupdatetheirDNSrecordsandlinka
dynamicIPaddresstothecorrectname.
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