<div class="content"><p> </p><p>The <b>R_DhcpDeleteFilterV4</b> method is used to delete a
link-layer address/pattern from allow list or deny list. This method is also
used to delete an exemption of a hardware type from filtering. However,
hardware type 1 (Ethernet 10 Mb) cannot be exempted, and this method cannot be
used to delete them.</p><dl>
<dd>
<div><pre> DWORD R_DhcpDeleteFilterV4(
   [in, unique, string] DHCP_SRV_HANDLE ServerIpAddress,
   [in] DHCP_ADDR_PATTERN* DeleteFilterInfo
 );
</pre></div>
</dd></dl><p><b>ServerIpAddress: </b>The IP address/host name of
the DHCP server. This parameter is unused. </p><p><b>DeleteFilterInfo: </b>This is a pointer to a <span><a href="a45ad236-6c42-42eb-9e67-c9335b61b7a7" data-linktype="relative-path">DHCP_ADDR_PATTERN (section 2.2.1.2.89)</a></span>
that contains link-layer address/pattern information to be deleted from the
database, from the allow or deny lists. It can also contain hardware type
information to be deleted from the database, from the allow list.</p><p><b>Return Values: </b>A 32-bit unsigned integer value
that indicates return status. A return value ERROR_SUCCESS (0x00000000)
indicates that the operation was completed successfully, else it contains a
Win32 error code, as specified in <span><a href="../ms-erref/1bc92ddf-b79e-413c-bbaa-99a5281a6c90" data-linktype="relative-path">[MS-ERREF]</a></span>.
This error code value can correspond to a DHCP-specific failure, which takes a
value between 20000 and 20099, or any generic failure.</p><dl>
<dd>
<table><thead>
  <tr>
   <th>
   <p>Return value/code</p>
   </th>
   <th>
   <p>Description</p>
   </th>
  </tr>
 </thead><tbody><tr>
  <td>
  <p>0x00000000</p>
  <p>ERROR_SUCCESS</p>
  </td>
  <td>
  <p>The call was successful.</p>
  </td>
 </tr><tr>
  <td>
  <p>0x00004E2D</p>
  <p>ERROR_DHCP_JET_ERROR</p>
  </td>
  <td>
  <p>An error occurred while accessing the DHCP Server
  Database.</p>
  </td>
 </tr><tr>
  <td>
  <p>0x00004E7F</p>
  <p>ERROR_DHCP_LINKLAYER_ADDRESS_DOES_NOT_EXIST</p>
  </td>
  <td>
  <p>Address or Address pattern is not contained in any of
  the list.</p>
  </td>
 </tr><tr>
  <td>
  <p>0x00000057</p>
  <p>ERROR_INVALID_PARAMETER</p>
  </td>
  <td>
  <p>Invalid input - address/pattern</p>
  </td>
 </tr><tr>
  <td>
  <p>0x00004E86</p>
  <p>ERROR_DHCP_UNDEFINED_HARDWARE_ADDRESS_TYPE</p>
  </td>
  <td>
  <p>Hardware type not present in the exemption list.</p>
  </td>
 </tr></tbody></table>
</dd></dl><p>The opnum field value for this method is 83.</p><p>When processing this call, the DHCP server MUST do the
following:</p><ul><li><p><span><span> 
</span></span>Validate whether this method is authorized for read/write access
per section <span><a href="38840bd0-0a5a-47ed-bc69-0dd870d33aec" data-linktype="relative-path">3.5.5</a></span>. If not,
return error ERROR_ACCESS_DENIED.</p>
</li><li><p><span><span> 
</span></span>If <i>DeleteFilterInfo</i> is NULL, return
ERROR_INVALID_PARAMETER.</p>
</li><li><p><span><span> 
</span></span>If the <b>MatchHWType</b> field of <i>DeleteFilterInfo</i> is
FALSE, return ERROR_INVALID_PARAMETER.</p>
</li><li><p><span><span> 
</span></span>An exemption for hardware types other than hardware type 1
(Ethernet 10 Mb) can be deleted if the <b>AddrPatt</b> member of the <i>DeleteFilterInfo</i>
parameter contains an <b>HWType</b> value other than 1 and the value of the <b>IsWildCard</b>
member of <i>DeleteFilterInfo</i> is TRUE, the hardware type specified by <b>ListType</b>
is allowed, and the value of the <b>Length</b> member is 0. For any other value
of <b>IsWildCard</b> or <b>Length</b>, return ERROR_INVALID_PARAMETER.</p>
</li><li><p><span><span> 
</span></span>If the <b>AddrPatt</b> member specified in <i>DeleteFilterInfo</i>
contains an <b>HWType</b> value of 1, the value of the <b>IsWildCard</b> member
of <i>DeleteFilterInfo</i> is FALSE, and the <b>Length</b> value is not equal
to 6, return ERROR_INVALID_PARAMETER.</p>
</li><li><p><span><span> 
</span></span>If the <b>AddrPatt</b> member specified in <i>DeleteFilterInfo</i>
contains an <b>HWType</b> value of 1, the value of the <b>IsWildCard</b> member
of <b>AddFilterInfo</b> is TRUE, and the <b>Length</b> value is greater than 5
or less than 1, return ERROR_INVALID_PARAMETER.</p>
</li><li><p><span><span> 
</span></span>Iterate through the server ADM element <b>DHCPv4FiltersList</b>
and if there is no <b>DHCPv4Filter</b> entry that has a <b>AddrPatt.Pattern</b>
field matching the  <b>AddrPatt.Pattern</b> field of <i>DeleteFilterInfo</i>
input parameter and the <b>AddrPatt.HwType</b> field matches the <b>AddrPatt.HwType</b>
field of <i>DeleteFilterInfo</i> input parameter, then return
ERROR_DHCP_LINKLAYER_ADDRESS_DOES_NOT_EXIST. Else, delete the <b>DHCPv4Filter</b>
entry from the <b>DHCPv4FiltersList</b>.</p>
</li><li><p><span><span> 
</span></span>If the <b>AddrPatt.HwType</b> field of the <i>DeleteFilterInfo</i>
input parameter is not equal to 1 and there is no <b>DHCPv4Filter</b> entry
that has a <b>AddrPatt.HwType</b> field matching the <b>AddrPatt.HwType</b>
field of <i>DeleteFilterInfo</i> input parameter, return ERROR_DHCP_UNDEFINED_HARDWARE_ADDRESS_TYPE.
Else, delete the <b>DHCPv4Filter</b> entry from the <b>DHCPv4FiltersList</b>.</p>
</li></ul><p><b>Exceptions Thrown:</b> No exceptions are thrown beyond
those thrown by the underlying RPC protocol <span><a href="../ms-rpce/290c38b1-92fe-4229-91e6-4fc376610c15" data-linktype="relative-path">[MS-RPCE]</a></span>.</p></div>