
Data Communication and Host Modes
Rev 2.0 Jul.09 61
Note: Regardless if the Raven XE is configured for Public Mode or
Private Mode, the same IP address will be given to all devices
connected to any of the ports. While you can connect with each to the
cellular network and the Internet, you cannot use the Raven XE as a
hub or router to communicate between them.
Internal DHCP Server
DHCP(DynamicHostConfigurationProtocol)hasbecomea
primarycomponentoftoday’snetworkenvironments.DHCP
allowsoneservertoautomaticallyanddynamicallyallocate
networkIPaddressesandothernetworkrelatedsettings(such
assubnetmasks,routers,etc.)toeachcomputerordevice
withouttheneedtosetupeachspecificallyor
keeptrackof
whataddresseshavealreadybeenused.
Inadefaultconfiguration,theRavenXEactsasaDHCPhost
toanydeviceconnectedtoitsports,providingthatdevicewith
anIPaddresswhichcanbeusedtocommunicateonthe
Internet.InPublicMode,thatwillbetheIPaddressassigned
bythecellularnetwork.InPrivate
Mode,thatwillbetheIP
addressdefinedin*HOSTPRIVIP.
1. WhentheRavenXEregistersonthecellularnetwork,itis
assignedanIPaddressfromyourcellularprovided,let’s
say10.1.2.0.
2. ActingasaDHCPserver,inPublicMode,whentheRaven
XEreceivesaDHCPrequestfromanEthernetdevice
connectedviaUSB,ithandsofftheassignedaddresstothe
deviceandsetsupthedefaultgatewayaddressas10.1.2.1.
Ifthefourthoctetisalreadya1,it
assigns10.1.2.2asthe
routeraddress.
3. TheRavenXEalsosendsa/24netmask(255.255.255.0by
default)andsetsupastaticroutewhichmaps
192.168.13.31(ortheaddressconfiguredwith
*HOSTPEERIPifitischanged)to10.1.2.1(or10.1.2.2ifthat
waswhatthegatewayaddresswasgivenas).
Tip: When PPPoE is used with the Raven XE, 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 XE to send all outgoing packets.
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