User guide

Introduction to the Raven XE
Rev 2.0 Oct.09 5
WiththeRavenXEinEthernetPublicmode,onlyonedevice
connectedtotheEthernetportwillreceivethepublicIP
addresswhichistheoneprovidedbythecellularnetwork.In
EthernetPrivatemode,withahuborswitch connectedtothe
Ethernetport,theRavenXEwillprovideNAT
forarangeof
computersorotherdevicesconnectedtotheswitchorhuband
Internetaccesstoallofthem.
Dynamic vs. Static IP Addresses
Therearetwotypesofaddressesonnetworks:dynamicand
static.
• Dynamicaddressesareassignedona“needtohave”basis.
YourRavenXEmightnotalwaysreceivethesameaddress
eachtimeitconnectswithAT&T.
• Staticaddressesarepermanentlyassignedtoaparticular
accountandwillalwaysbeusedwheneveryourRavenXE
connectstotheInternet.TheIPaddresswillnotbegiven
toanyoneelse.
MostISPs(cellularincluded)usedynamicIPaddressesrather
thanstaticIPaddressessinceitallowsthemtoreuseasmaller
numberofIPaddressesforalargenumberofcustomers.A
dynamicIPaddressissuitableformanycommonInternet
uses,suchaswebbrowsing,lookingupdataonanother

computersystem,orotherclientfunctions(suchasdataonly
beingsentoutoronlybeingreceivedafteraninitialrequest).
Tip: If your account with AT&T includes a dynamic IP address and
you need a static IP, please consult your AT&T Representative for
more information about changing your account for static IP support.
IfyouneedtocontactyourRavenXE,adeviceconnectedto
theRavenXE,orahostsystemusingtheRavenXEfromthe
Internet,youneedtohaveaknownIP(suchasonewhichis
static)ordomainname(anIPaddresswhichisconvertedbya
DNS
serverintoawordbasedname).IfyouhaveadynamicIP
addressforyourmodem,youcanuseaDynamicDNSservice
(suchasIPManager)totranslateyourIPaddressintotoa
domainname.
Caution: If you want to connect remotely to your Raven XE using
TCP/IP, the IP address given to your modem by AT&T cannot be a
private or internal IP address (such as a special private network)
unless you are on the same network or inside that network’s firewall
(such as with frame relay).