SecureStack C3 Configuration Guide 24-1
24
DHCPv6 Configuration
ThecommandsdescribedinthischapterperformconfigurationoftheDynamicHost
ConfigurationProtocolforIPv6(DHCPv6)ontheSecureStackC3.
Overview
DHCPisgenerallyusedbetweenclients(forexample,hosts)andservers(forexample,routers)for
thepurposeofassigningIPaddresses,gateways,andothernetworkingdefinitionssuchasDNS,
NTP,and/orSIPparameters.However,IPv6nativelyprovidesforautoconfigurationofIP
addressesthroughtheIPv6NeighborDiscoveryProtocol(NDP)andtheuseofRouter
Advertisementmessages.Thus,theroleofDHCPv6withinthenetworkisdifferentfromDHCPv4
inthatitislessrelieduponforIPaddressassignment.
DHCPv6serverandclientinteractionsaredescribedbyRFC3315.Therearemanysimilarities
betweenDHCPv6andDHCPv4interactionsandoptions,butthemessagesandoptiondefinitions
aresufficientlydifferent.ThereisnomigrationorinteroperabilityfromDHCPv4toDHCPv6.
DHCPv6incorporatesthenotionofthestatelessserver,whereDHCPv6isnotusedforIPaddress
assignmenttoaclient.Instead,itonlyprovidesothernetworkinginformationsuchasDNS,NTP,
and/orSIPinformation.ThestatelessserverbehaviorisdescribedbyRFC3736,whichsimply
containsdescriptionsoftheportionsofRFC3315thatarenecessaryforstatelessserverbehavior.
InorderforaroutertodriveaDHCPv6clienttoutilizestatelessDHCPv6,the“otherstateful
configuration”optionmustbeconfiguredforneighbordiscoveryonthecorrespondingIPv6
routerinterface.ThisinturncausesDHCPv6clientstosendtheDHCPv6“InformationRequest”
messageinresponse.ADHCPv6serverthenrespondsbyprovidingonlynetworkingdefinitions
suchasDNSdomainnameandserverdefinitions,NTPserverdefinitions,and/orSIPdefinitions.
* IPv6 Routing License Required *
IPv6 routing must be enabled with a license key in order to use this feature. If you have purchased an IPv6
routing license key, and have enabled routing on the device, you must activate your license as described in
the chapter entitled “Activating Licensed Features” in order to enable the DHCPv6 configuration command
set. If you wish to purchase an IPv6 routing license, contact Enterasys Networks Sales.
For information about... Refer to page...
Global Configuration Commands 24-2
Address Pool Configuration Commands 24-6
Interface Configuration Commands 24-10
DHCPv6 Show Commands 24-13