D-Link DWS-4026 [279/741] Ip helper global configuration

ConfiguringtheIPHelperFeatures

D-Link UnifiedWiredandWirelessAccessSystem

November2011 Page279

D‐LinkUWSUserManual

ConfiguringtheIPHelperFeatures

TheIPHelperfeatureprovidestheabilityforaroutertoforwardconfiguredUDPbroadcastpacketstoa

particularIPaddress.Thisallowsapplicationstoreachserversonnon‐localsubnets.Thisispossibleevenwhen

theapplicationisdesignedtoassumeaser verisalwaysonalocalsubnetorwhenth

eapplicationuses

broadcastpacketstoreachtheserver(withthelimitedbroadcastaddress255.255.255.255,oranetwork

directedbroadcastaddress).

Youcanconfigurerelayentriesgloballyandonroutinginterfaces.Eachrelayentrymapsaningressinterface

anddestinationUDPportnumbertoasingleIPv4address(thehelpera

ddress).Multiplerelayentriesmaybe

configuredforthesameinterfaceandUDPport,inwhichcasetherelayagentrelaysmatchingpacketstoeach

serveraddress.Interfaceconfigurationtak espriorityoverglobalconfiguration.IfthedestinationUDPportfor

apacketmatchesanyentryontheingressinterface,thepacketishand

ledaccordingtotheinterface

configuration.Ifthepacketdoesnotmatchan yentryontheingressinterface,thepacketishand ledaccording

totheglobalIPhelperconfiguration.

IPHelperGlobalConfiguration

UsetheIPHelperGlobalConfigurationpagetogloballyenabletheIPHelperadminmodeandtoconfigure

globalrelaysettingsontheswitch.

Todisplaythepage,clickLAN>L3Features>IPHelper>GlobalConfigurationinthenavigationtree.

Figure180:IPHelperGlobalConfiguration

Table161:IPHelperGlobalCo

nfigurationFields

Field Description

UDPRelayMode Selectenableordisablefromthepulldownmenu.UsermustenableRelay

ModetorelayanyotherprotocolsforwhichanIPhelperaddresshasbeen

configured.ByDefaultUDPRelayModeisdisabled.

UDPDestinationPort ShowsthedestinationUDPportID/PortNameofUDPpacketstobere

layed.