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Data Communication and Host Modes
Rev 3.0B Feb.08 55
PPPmodeisenteredfromtheATmodebyusinganyofthe
followingcommands:
• AT\APPP
• ATDT10.0.0.1
• ATDT1000 1
• ATD#19788or#777*99***1#
• CLIENT
Inresponsetoanyoftheprecedingcommands,theRavenwill
respondwithCONNECTacarriagereturnandnewlineandis
readyforthehosttobeginPPPnegotiations.TheIPreceived
bythehostintheresultingnegotiationwilleitherbeaprivate
(non‐routable)IPaddressora
public(network‐routable)IP
addressprovidedbythenetwork,dependingonthesettingsof
*HOSTPRIVMODE.If*HOSTPRIVMODE=1,thevalueof
theprivateIPaddresscanbedeterminedbeforehandby
queryingS110.TheprivateIPaddresstobeusedcanbe
definedwiththecommandAT*HOSTPRIVIP=192.168.100.33,
substitutingthedesired
IPaddress.
Figure 6-5: AceManager : PPP/Ethernet
UsingaprivateIP insulatesthePPPclientfromchangesinIP
addressesoftheunderlyingnetwork.Thewillperformbasic
NAT‐likeaddresstranslationonallpackets.
IfapublicIPaddressisbeingused,anychangesintheIP(as
determinedbythewirelessnetwork)willresultinthePPPlink
tothehostbeingdisconnected,requiringthehosttoreinitiate
it.ThepublicIPispassedtothehostinthePPPnegotiations,
sowhenthe
networkforcesachange,themodemhastoforce
thehosttorenegotiatethePPPlinktomakethishappen.