VMware Workstation 7 Instrukcja Użytkownika Pobierz pdf (Strona 317)

VMware, Inc. 317

Chapter 15 Advanced Virtual Networking

ThehostcomputerhasahostvirtualadapterontheNATnetworkidenticaltothehost

virtualadapteronthehost‐onlynetwork.Thisadapterallowsthehostandthevirtual

machinestocommunicatewitheachotherforsuchpurposesasfilesharing.TheNAT

deviceneverforwardstrafficfromthehostvirtualadapter

How the NAT Device Uses the VMnet8 Virtual Switch

TheNATdeviceisconnectedtotheVMnet8virtualswitch.Virtualmachinesconnected

totheNATnetworkalsousetheVMnet8virtualswitch.

TheNATdevicewaitsforpacketscomingfromvirtualmachinesontheVMnet8virtual

network.Whenapacketarrives,theNATdevicetranslatestheaddressofthevirtual

mach

inetotheaddressofthehostbeforeforwarding

thepackettotheexternal

network.Whendataarrivesfromtheexternalnetworkforthevirtualmachineonthe

privatenetwork,theNATdevicereceivesthedata,replacesthenetworkaddresswith

theaddressofthevirtualmachineandforwardsthedatatothevi

rtualma

chineonthe

virtualnetwork.Thistranslationoccursautomaticallyandrequiresminimal

configurationontheguestandthehost.

DHCP on the NAT Network

Tomakenetworkingconfigurationeasy,aDHCPserverisinstalledwhenyouinstall

Workstation.VirtualmachinesrunningonthenetworkwiththeNATdevicecansend

outDHCPrequeststodynamicallyobtaintheirIPaddresses.

TheDHCPserverontheNATnetwork,whichisalsousedinhost‐onlynetworking

configurations,dy

namicallyallocatesIPaddressesintherangeof<net>.128through

<net>.254,where<net>isthenetworknumberassignedtoyourNATnetwork.

WorkstationalwaysusesaClassCaddressforNATnetworks.IPaddresses<net>.3

through<net>.127canbeusedforstaticIPaddresses.IPaddress<net>.1isreser

ved

forthe hostadapterand<net>.2isreservedfortheNATdevice.Formoreinformation,

see“DHCPConventionsforAssigningIPAddresses”onpage 305.

InadditiontotheIPaddress,theDHCPserverontheNATnetworksendsout

configurationinformationthatenablesthevirtualmachinetooperate.Thisinformation

clud

esthedefaultgatewayandtheDNSserver.IntheDHCPresponse,theNAT

deviceinstructsthevirtualmachinetousetheIPaddress<net>.2asthedefault

gateway andDNSserver.ThisroutingcausesallIPpacketsdestinedfortheexternal

networkandDNSrequeststobeforwardedtoth

eNATde

vice.

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