如何在xenserver中设置没有默认网关的ip

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1、HowtoSetupXenServerinaRoutedNetworkDocumentID:CTX121169  /  CreatedOn:2010-2-4  /  UpdatedOn:2010-2-4AverageRating:(2ratings)Viewproductsthisdocumentappliesto SummaryInsomecases(suchashostingenvironments),multiplesubnetsofIPaddressesareprovidedonasingleint

2、erfacewheresubnetsotherthantheoriginalarenotassignedadefaultgateway.ThisconfigurationworkswhenanIPinterfaceexistswithinthesamesubnetasthedefaultgatewayfromtheprimarysubnet,howeverthisisnotalwayspossible.Thediagrambelowdepictsthisscenario:Inthiscase,ifaVMis

3、configuredwithinthe172.16.20.0/24subnet,thecustomer’sdefaultgateway(172.16.1.1)cannotbeusedandconnectivitytosubnetsotherthan172.16.20.0/24isnnotpossible.Wheneverpossible,youshouldconfigurethedefaultgatewayforthesecondarysubnetsassecondaryIPaddressesontheVL

4、AN.Thisactioncompletelyavoidstheneedforcomplexworkarounds.NoticeThisarticlemakeschangestotheXenServerconfigurationwhich,ifmadeimproperly,mightpreventnetworkaccesstothehostorcompromisesecurity.ThesechangesmightalsobeoverwrittenafterupdatesorupgradesbetweenX

5、enServerreleases.RequirementsOneormoreXenServerhostsconfiguredwithanexistingmanagementIPaddressinthesamesubnetasthedefaultgateway.Toimplementthisprocedure,itisassumedthatyouhavebasicLinux(suchaseditingfiles)andnetworkingknowledge.BackgroundXenServerisdesig

6、nedtoallowasingleIPaddresspermanagementinterface.Inaddition,XenServerdoesnotbydefaultfacilitateroutingbetweenIPinterfacesasthiscancompromisesystemsecurityifnotimplementedproperly.ForXenServertoworkeffectivelyinthistypeofenvironment,itmustbeconfiguredto:1.A

7、llowoneormoresecondaryIPaddressestobeconfiguredonagivenmanagementinterface.2.EnableforwardingbetweenIPinterfaces.3.Configurethein-builtIPTablesfirewalltoallowforwardingbetweentheprimaryandsecondarysubnets.Fromthesecondarysubnet,anIPaddressisdesignatedasthe

8、defaultgateway,whichisconfiguredontheXenServerhost.AllVMsusingthesecondarysubnet(s)routeexternalroutestotheXenServerDomain0.Thediagrambelowshowsthemodifiedbehavior:ProcedurePerformthefollowingstepstoconfigure