001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied. See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 *
019 */
020
021 package org.apache.directory.server.dhcp.options.dhcp;
022
023
024 import org.apache.directory.server.dhcp.options.DhcpOption;
025
026
027 /**
028 * This option is used by DHCP clients to specify their unique
029 * identifier. DHCP servers use this value to index their database of
030 * address bindings. This value is expected to be unique for all
031 * clients in an administrative domain.
032 *
033 * Identifiers SHOULD be treated as opaque objects by DHCP servers.
034 *
035 * The client identifier MAY consist of type-value pairs similar to the
036 * 'htype'/'chaddr' fields. For instance, it MAY consist
037 * of a hardware type and hardware address. In this case the type field
038 * SHOULD be one of the ARP hardware types defined in STD2. A
039 * hardware type of 0 (zero) should be used when the value field
040 * contains an identifier other than a hardware address (e.g. a fully
041 * qualified domain name).
042 *
043 * For correct identification of clients, each client's client-
044 * identifier MUST be unique among the client-identifiers used on the
045 * subnet to which the client is attached. Vendors and system
046 * administrators are responsible for choosing client-identifiers that
047 * meet this requirement for uniqueness.
048 *
049 * The code for this option is 61, and its minimum length is 2.
050 *
051 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
052 * @version $Rev: 638228 $, $Date: 2008-03-18 08:12:41 +0200 (Tue, 18 Mar 2008) $
053 */
054 public class ClientIdentifier extends DhcpOption
055 {
056 /*
057 * @see org.apache.directory.server.dhcp.options.DhcpOption#getTag()
058 */
059 public byte getTag()
060 {
061 return 61;
062 }
063 }