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Table Of Contents
VMware, Inc. 59
Chapter 7 Working with Configurations
TheBlockInandOutoptionisusefulinthesecircumstances:
Youaretestingsoftwarevirusesthatneedtoremainisolatedfromthephysicalnetwork.
Youaretestingaclientserverapplicationinisolation.
Virtual Networks
Virtualnetworksarebasedonthespecificationsdefinedinanetworktemplateandgetcreatedby
Lab Managerwhenyoudeployaconfiguration.See“SettingUpNetworkTemplatesonpage 29and
“ManagingNetworkTemplatesonpage 123formoreinformationaboutnetworktemplates.
Virtualnetworksareconfigurationlocalnetworks.Theyexistinsideconfigurations
anddonotspan
configurations.Virtualmachinesconnectedtoavirtualnetworkcannotcommunicatewithvirtualmachines
connectedtoadifferentvirtualnetwork.EachvirtualnetworkthatLab Managercreatesisuniqueandisolated
fromothervirtualnetworks,evenifthenetworksarebasedonthesamenetworktemplate.
vSwitchesandport
groupscreatedbyLab Managerforvirtualnetworksarenamedwiththenetworkname
concatenatedwithIDsassociatedwiththenetwork,installation,andhost.
Connecting Virtual Networks to Physical Networks
Virtualnetworkscanbeconnectedtophysicalnetworksatdeploytime.Connectingvirtualnetworksto
physicalnetworksprovidesthevirtualmachinesusingthosevirtualnetworksaccesstophysicalnetworks.
Lab Managerusesavirtualroutertoconnectthevirtualandphysicalnetworks.
Virtual to Physical Network Connectivity
Twoconnectivitymodesareavailablewhenyouconnectavirtualnetworktoaphysicalnetwork:
AllowInandOutVirtualmachinescancommunicatewithmachinesontheselectedphysicalnetwork,
andmachinesontheselectedphysicalnetworkcancommunicatewithvirtualmachinesinsidethe
configuration.
AllowOutVirtualmachinesintheconfigurationcaninitiatecommunicationwithmachinesonthe
selectedphysicalnetworkandcanreceivemessagesbackonthesameconnection.Machinesonthe
selectedphysicalnetworkcannotinitiatecommunicationwithvirtualmachinesinsidetheconfiguration.
Host Spanning
HostSpanningisafeaturethatenablesthevirtualmachinesinaconfigurationthatusesfencingorvirtual
networkstobedeployedondifferentESX/ESXihosts.WhenyoudeployaconfigurationthatusesHost
Spanning,someofthevirtualmachinescangetdeployedtooneESX/ESXihostandsomeofthe
virtual
machinescangetdeployedtoadifferenthost.
Foraconfigurationthatisunfencedanddoesnotincludeanyvirtualnetworks,Lab Managercanalways
deployitsvirtualmachinesacrossmultiplehosts.Foraconfigurationthatisfencedorincludesavirtual
network,youcanenableHostSpanning,providedthat
theconfigurationhasaccesstoanenabledhost
spanningtransportnetwork.
IfyoudonotenableHostSpanningforaconfigurationthatusesfencingoravirtualnetwork,allofitsvirtual
machinesmustdeploytothesamehost.Insomecases,thisrestrictionmaypreventyoufromdeployinga
configuration.
Forexample,foralargeconfiguration,theremightnotbeanysinglehostavailablethathas
enoughresourcestodeploytheconfiguration.Inaddition,HostSpanningisrequiredinordertosupport
VMwareDRSandHAforconfigurationsthatusefencingoravirtualnetwork.
Host Spanning Networks
Hostspanningnetworksarelogicalov erlaynetworksthatusetheresourcesofanunderlyinghostspanning
transportnetworktoenableHostSpanning.Lab M anagercreatesahostspanningnetworkwhenyoudeploy
aconfigurationwithHostSpanningenabled.HostspanningnetworksarenotvisiblewithinLab Manager.