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Sierra Wireless 2170042 Modem User Manual

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Rev A Dec.08 2

Configuring your Sierra Wireless

AirLink modem for IP Manager

and DNS

IfyouhaveafleetofSierraWirelessAirLinkmodemsoreven

ifyouonlyhaveone,itcanbedifficulttokeeptrackofthe

currentIPaddresses,especiallyiftheaddressesaren’tstatic

butchangeeverytimethemodemsconnecttoyourcellular

provider.Ifyouneedtoconnect

toamodem,orthedevice

behindit,itissomucheasierwhenyouhaveadomainname

(car54.mydomain.com,whereareyou?).

Reasons to contact the modem and/or the connected

device:

• Requestingalocationupdatefromadeliverytruck.

• Contactingasurveillancecameratodownloadlogsor

surveyaspecificarea.

• Anoilderekthatneedstobetriggeredtobeginpumping.

• Sendingtexttobedisplayedbyaroadsign.

• Updatingthesongstobeplayedonajukebox.

• Updatingadve rtisementstobedisplayedinacab.

• Remoteaccesstoacom puter,aPLC,anRTU,orother

system.

• Monitoringandtroubleshootingthestatusofthemodem

itselfwithoutneedingtobringitinorgoouttoit.

AdynamicIPaddressissuitablefor manyInternetactivities

suchaswebbrowsing,lookingupdataonanothercomputer

system,dataonlybeingsentout,ordataonlybeingreceived

afteraninitialrequest(alsocalledMobileOriginated).

However,ifyouneedtocontactyourmodemdirectly,adevice

connected

tothemodem,orahostsystemusingyourmodem

(alsocalledMobileTerminated),adynamicIPwon’t giveyoua

reliableaddresstocontact(sinceitmayhavechangedsincethe

lasttimeitwasassigned).

DomainnamesareoftenonlyconnectedtostaticIPaddresses

becauseofthewaymostdomainname(DNS)serversareset‐

up.DynamicDNSserversrequirenotificationofIPAddress

changessotheycanupdatetheirDNSrecordsandlinka

dynamicIPaddresstothecorrectname.

• DynamicIPaddressesaregrantedonlywhenyourmodem

isconnectedandcanchangeeachtimethemodemrecon

‐

nectstothenetwork.

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