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LanScaper
TM
PING
=PacketINternetGroper-Asimplecommunicationprotocol(ICMPEcho)usedtorequest
anechobackfromanaddresseddevice(target).TheLanScaper™usesthistoverifyIP
connectivitybetweenitselfandanotherdevice.
Router
Target
TCP/IP
WAN
=Gateway-IfadeviceisattemptingtocommunicatewithanIPaddress,anditfindsthat
thetargetisnotonitslocalnetwork(bycomparingthetargetaddresswithit'sownaddressandthe
Netmask)thedevicemustforwardit'srequesttoarouter.Therouterforwardsthecommunication
tothetargetdeviceacrosstheWAN.Thistypicallyputsthecommunicationsontheinternet,but
mayalsobeanotherLANsubnet,oraprivatenetworkofsomeothertype.ArouterhasanIP
addressandMACaddress(onEthernet)ofitsownfordirectcommunications,whichdifferentiates
itfromaHUBorswitch.Ahardw
areboxsoldasarouterwillusuallyincludeaHUBorswitch
chipinside,providingaconvenientconnectionpointformultipleEthernetdevices.
-InthePINGprotocol,anIPaddressmustbeselectedtoreceiveanechorequest.This
addressisthe"target"addressforthatPING.IntheLanScaper™,atargetmustbeselected
manuallyinSetup.ThistargetcanbeontheLAN,oranywhereelseaccessiblethrougharouter
connectedtotheLAN.IfthetargetisnotontheLAN,therouterIPaddressmustbeknownsothe
PINGcanbesenttotherouterwhichforwardsitontowardtheultimatelocation.
=TransmissionControlProtocol/InternetProtocol
=WideAreaNetwork-The"remote"interfaceonarouter.TheWANmaybeaccessedviaa
DSLline,broadbandcableconnection,ISDN,T1lineorevenadial-upmodemline.Thistermis
usedtolooselydefinethehardwarepathusedtocommunicatewithanyIP-addresseddevicenoton
thelocalLAN.