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Sierra Raven EDGE Network Card User Manual

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Data Communication and Host Modes

Rev 3.0B Feb.08 49

1. WhentheRavenregistersonthecellularnetwork,itis

assignedanIPaddressfromyourcellularprovider,let’s

sayA.B.C.D.

2. ActingasaDHCPserver,inPublicMode,whentheRaven

receivesaDHCPrequestfromanEthernetdevice,ithands

offtheassignedaddresstothedeviceandsetsupthe

defaultgatewayaddressasA.B.C.1.Ifthefourthoctetis

alreadya1,itassignsA.B.C.2asthe

routeraddress.

3. TheRavenalsosendsa/24netmask(255.255.255.0by

default)andsetsupastaticroutewhichmaps

192.168.13.31(ortheaddressconfiguredwith

*HOSTPEERIPifitischanged)toA.B.C.1(orA.B.C.2if

thatwaswhatthegatewayaddresswasgivenas).

Tip: When PPPoE is used with the Raven, DHCP is not needed. A

tunnel is set up connecting a device (such as your computer or a

router) with the modem. The device will then simply use the MAC

address of the Raven to send all outgoing packets.

Keepalive

Keepaliveisusedtotesttheconnectiontothecellularnetwork

bypinginganIPaddressafteraspecifiedperiodofinactivity.

Keepaliveisonlyrecommendedforuserswhohavearemote

terminatedmodemthatinfrequentlycommunicatestothe

networkorifyouhaveexperiencedissuesovertimewherethe

modem

cannolongerbereachedremotely.

WhenKeepalivepingstheIPaddress,anacknowledgement

indicatesthereisanactiveconnectiontothenetwork.Ifthe

RavendoesnotreceivearesponsefromtheIPaddress,itwill

makeadditionalattemptsaccordingtoabackoffalgorithm

beforedeterminingtheInternetconnectionisnotfunctioning

properly.Ifitdetermines

theconnectionisnotfunctioning,the

modemwillthenattempttoreconnecttoyourcellular

providertoreestablishIPconnectivity.

Configuring Keepalive

InAceManager,theKeepalivesettingsarepartoftheOther

group.

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