Dhcpv6ReleasePrefix function

The Dhcpv6ReleasePrefix function releases a prefix previously acquired with the Dhcpv6RequestPrefix function.


DWORD Dhcpv6ReleasePrefix(
  IN LPWSTR                         adapterName,
  IN LPDHCPV6CAPI_CLASSID           classId,
  IN LPDHCPV6PrefixLeaseInformation leaseInfo



Name of the adapter on which the PD request must be sent.


Pointer to a DHCPV6CAPI_CLASSID structure that contains the binary ClassId information to use to send on the wire.

Note   DHCPv6 Option Code 15 (0x000F) is not supported by this API. Typically, the User Class option is used by a client to identify the type or category of user or application it represents. A server selects the configuration information for the client based on the classes identified in this option.


Pointer to a DHCPV6CAPIPrefixLeaseInformation structure that is used to release the prefix.

Return Value

Returns ERROR_SUCCESS upon successful completion.

Return code Description
Returned if one of the following conditions are true:
  • AdapterName is NULL.
  • prefixleaseInfo is NULL.


Release messages sent as the result of the call to this function must contain the following values for the T1 and T2 fields of the DHCPV6CAPIPrefixLeaseInformation structure supplied in the prefixleaseInfo parameter:

  • T1: the renewal time for the prefix, in seconds specified as absolute time values.
  • T2: the rebind time of the prefix, in seconds specified as absolute time values.


Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Target Platform Windows
Header dhcpv6csdk.h
Library Dhcpcsvc6.lib
DLL Dhcpcsvc6.dll