VMware Workstation 7 Uživatelský manuál stáhnout pdf (Strana 318)

Workstation User’s Manual

318 VMware, Inc.

DNS on the NAT Network

TheNATdeviceactsasaDNSserverforthevirtualmachinesontheNATnetwork.

The NATdeviceisaDNSproxyandforwardsDNSrequestsfromthevirtualmachines

toaDNSserverthatthehostknows.ResponsesreturntotheNATdevice,whichthen

forwardsthemtothevirtualmac

hines.

IftheygettheirconfigurationinformationfromDHCP,thevirtualmachinesonthe

NATnetworkautomaticallyusetheNATdeviceastheDNSserver.However,the

virtualmachinescanbestaticallyconfiguredtouseanotherDNSserver.

ThevirtualmachinesintheprivateNATnetworkarenotaccessiblethroughDNS.To

hav

ethevirtualmach

inesrunningontheNATnetworkaccesseachotherbyDNS

names,youmustsetupaprivateDNSserverconnectedtotheNATnetwork.

External Access from the NAT Network

AvirtualmachineontheNATnetworkcanuseanyprotocolusingTCPorUDPaslong

asthevirtualmachineinitiatesthenetworkconnection.Thisistrueformostclient

applicationssuchasWebbrowsing,Telnet,passive‐modeFTP ,anddownloading

streamingvideo.AdditionalprotocolsupportisbuiltintotheNA

TdevicetoallowFTP

andICMPecho(ping)toworktransparentlythroughtheNAT.

Ontheexternalnetworktowhichthehostisconnected,anyvirtualmachineonthe

NATnetworkappearstobethehostitself,becauseitsnetworktrafficusesthehost’s

IP address.Thevirtualmachinecansendandre

ceivedatausingTCP/IPtoanymachine

thatisaccessiblefromthehost.

Beforeanycommunicationcanoccur,theNATdevicemustsetupamapbetweenthe

virtualmachine’saddressontheprivateNATnetworkandthehost’snetworkaddress

ontheexternalnetwork.

Whenavirtualmachineinitiatesanetw

orkconnectionwithanothernetworkresource,

thisma

piscreatedautomatically.Theoperationistransparenttotheuserofthevirtual

machineontheNATnetwork.Noadditionalworkneedstobedone.

NetworkconnectionsthatareinitiatedfromoutsidetheNATnetworktoavirtual

machineontheNATne

tworkarenottransparen

t.Whenamachineontheexternal

networkattemptstoinitiateaconnectionwithavirtualmachineontheNATnetwork,

itcannotreachthevirtualmachinebecausetheNATdevicedoesnotforwardthe

request.

However,youcanconfigureportforwardingmanuallyontheNATdevicesothat

netw

orktrafficdestinedforacertainportcanstillbeforwardedautomaticallytoa

virtualmachineontheNATnetwork.See“AdvancedNATConfiguration”onpage 319.

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