Dhcpv6RequestPrefix function (dhcpv6csdk.h)

The Dhcpv6RequestPrefix function requests a specific prefix.


DWORD Dhcpv6RequestPrefix(
  [in]      LPWSTR                         adapterName,
  [in]      LPDHCPV6CAPI_CLASSID           pclassId,
  [in, out] LPDHCPV6PrefixLeaseInformation prefixleaseInfo,
  [out]     DWORD                          *pdwTimeToWait


[in] adapterName

GUID of the adapter on which the prefix request must be sent.

[in] pclassId

Pointer to a DHCPV6CAPI_CLASSID structure that contains the binary ClassId information to send on the wire. This parameter is optional.

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.

[in, out] prefixleaseInfo

Pointer to a DHCPV6PrefixLeaseInformation structure that contains the prefix lease information.

The following members of the DHCPV6PrefixLeaseInformation structure must follow these guidelines.

DHCPV6PrefixLeaseInformation member Consideration
nPrefixes Must contain a maximum value of 10. The caller should have the memory allocated in the prefixArray member based on the number of prefixes specified.
iaid A unique positive number assigned to this member. This same value should be reused if this function is called again.This mandatory value must be set by the calling application.
ServerIdLen Must contain a maximum value of 128. The caller must have the memory allocated in the ServerId member based on the specified ServerIdLen value.

The caller must follow these considerations when assigning the values of the nPrefixes, iaid, and ServerIdLen members of the DHCPV6PrefixLeaseInformation structure. Based on these values, memory must also be properly allocated to the ServerId and PrefixArray members before the Dhcpv6RequestPrefix function is called.

[out] pdwTimeToWait

Contains the number of seconds a requesting application needs to wait before calling the Dhcpv6RenewPrefix function to renew its acquired prefixes. A value of 0xFFFFFFFF indicates that the application does not need to renew its lease.

Return value

Returns ERROR_SUCCESS upon successful completion.

Return code Description
The value of the nPrefixes or the ServerIdLen member specified is less than the number of prefixes available from the server or the available server ID length. Increase the nPrefixes or the ServerIdLen member and make sure the corresponding memory has been allocated properly before calling the Dhcpv6RequestPrefix function again.
Returned if one of the following conditions are true:
  • AdapterName is NULL. Or no adapter is found with the GUID specified.
  • prefixleaseInfo is NULL.
  • pdwTimeToWait is NULL.
  • The iaid member of the prefixleaseInfo is zero.
The AdapterName is not in the correct format. It should be in this format: {00000000-0000-0000-0000-000000000000}.


Requirement Value
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