Dynamic Host Configuration Protocol (DHCP) and Bootstrap Protocol (BOOTP) Parameters

(last updated 2008-10-28)

Registries included below:
- BOOTP Vendor Extensions and DHCP Options 
  - DHCP Message Type 53 Values
  - Network/IP Option Type 63 Sub-Option Codes 
  - DHCP Cablelabs Client Configuration Option Type 122 Sub-Option Codes 
  - GeoConf Option fields (Value 123) - The Altitude (AT) field
  - GeoConf Option fields (Value 123) - The Datum field
- CableLabs Client Configuration Option Ticket Control Mask Bit Definitions
- DHCP Relay Agent Sub-Option Codes
  - Authentication Suboption (value 8) - Algorithm identifier values
  - Authentication Suboption (value 8) - Replay Detection Method (RDM) identifier values 

Note: 
For the Civic Address Types Registry [RFC4776], please see:
http://www.iana.org/assignments/civic-address-types-registry

Registry Name: BOOTP Vendor Extensions and DHCP Options 
Reference: [RFC2939]
Registration Procedures: IETF Consensus

Note: 
The Bootstrap Protocol (BOOTP) [RFC951] describes an IP/UDP bootstrap
protocol (BOOTP) which allows a diskless client machine to discover
its own IP address, the address of a server host, and the name of a
file to be loaded into memory and executed.  The Dynamic Host
Configuration Protocol (DHCP) [RFC2131] provides a framework for
automatic configuration of IP hosts.  The document "DHCP Options and 
BOOTP Vendor Information Extensions" [RFC2132] describes options for 
DHCP, some of which can also be used with BOOTP. Additional DHCP 
options are described in other RFCs, as documented in this registry.

Registry:
                                           Data 
Tag       Name                             Length  Meaning                                           Reference
--------  -------------------------------  ------  ------------------------------------------------  ---------
0         Pad                              0       None                                              [RFC2132]    
1         Subnet Mask                      4       Subnet Mask Value                                 [RFC2132] 
2         Time Offset                      4       Time Offset in Seconds from UTC                   [RFC2132]
                                                   (note: deprecated by 100 and 101) 
3         Router                           N       N/4 Router addresses                              [RFC2132] 
4         Time Server                      N       N/4 Timeserver addresses                          [RFC2132] 
5         Name Server                      N       N/4 IEN-116 Server addresses                      [RFC2132] 
6         Domain Server                    N       N/4 DNS Server addresses                          [RFC2132] 
7         Log Server                       N       N/4 Logging Server addresses                      [RFC2132] 
8         Quotes Server                    N       N/4 Quotes Server addresses                       [RFC2132] 
9         LPR Server                       N       N/4 Printer Server addresses                      [RFC2132] 
10        Impress Server                   N       N/4 Impress Server addresses                      [RFC2132] 
11        RLP Server                       N       N/4 RLP Server addresses                          [RFC2132] 
12        Hostname                         N       Hostname string                                   [RFC2132] 
13        Boot File Size                   2       Size of boot file in 512 byte chunks              [RFC2132] 
14        Merit Dump File                  N       Client to dump and name the file to dump it to    [RFC2132] 
15        Domain Name                      N       The DNS domain name of the client                 [RFC2132] 
16        Swap Server                      N       Swap Server address                               [RFC2132] 
17        Root Path                        N       Path name for root disk                           [RFC2132] 
18        Extension File                   N       Path name for more BOOTP info                     [RFC2132] 
19        Forward On/Off                   1       Enable/Disable IP Forwarding                      [RFC2132] 
20        SrcRte On/Off                    1       Enable/Disable Source Routing                     [RFC2132] 
21        Policy Filter                    N       Routing Policy Filters                            [RFC2132] 
22        Max DG Assembly                  2       Max Datagram Reassembly Size                      [RFC2132] 
23        Default IP TTL                   1       Default IP Time to Live                           [RFC2132] 
24        MTU Timeout                      4       Path MTU Aging Timeout                            [RFC2132] 
25        MTU Plateau                      N       Path MTU  Plateau Table                           [RFC2132] 
26        MTU Interface                    2       Interface MTU Size                                [RFC2132] 
27        MTU Subnet                       1       All Subnets are Local                             [RFC2132] 
28        Broadcast Address                4       Broadcast Address                                 [RFC2132] 
29        Mask Discovery                   1       Perform Mask Discovery                            [RFC2132] 
30        Mask Supplier                    1       Provide Mask to Others                            [RFC2132] 
31        Router Discovery                 1       Perform Router Discovery                          [RFC2132] 
32        Router Request                   4       Router Solicitation Address                       [RFC2132] 
33        Static Route                     N       Static Routing Table                              [RFC2132] 
34        Trailers                         1       Trailer Encapsulation                             [RFC2132] 
35        ARP Timeout                      4       ARP Cache Timeout                                 [RFC2132] 
36        Ethernet                         1       Ethernet Encapsulation                            [RFC2132] 
37        Default TCP TTL                  1       Default TCP Time to Live                          [RFC2132] 
38        Keepalive Time                   4       TCP Keepalive Interval                            [RFC2132] 
39        Keepalive Data                   1       TCP Keepalive Garbage                             [RFC2132] 
40        NIS Domain                       N       NIS Domain Name                                   [RFC2132] 
41        NIS Servers                      N       NIS Server Addresses                              [RFC2132] 
42        NTP Servers                      N       NTP Server Addresses                              [RFC2132] 
43        Vendor Specific                  N       Vendor Specific Information                       [RFC2132] 
44        NETBIOS Name Srv                 N       NETBIOS Name Servers                              [RFC2132] 
45        NETBIOS Dist Srv                 N       NETBIOS Datagram Distribution                     [RFC2132] 
46        NETBIOS Node Type                1       NETBIOS Node Type                                 [RFC2132] 
47        NETBIOS Scope                    N       NETBIOS Scope                                     [RFC2132] 
48        X Window Font                    N       X Window Font Server                              [RFC2132] 
49        X Window Manager                 N       X Window Display Manager                          [RFC2132] 
50        Address Request                  4       Requested IP Address                              [RFC2132] 
51        Address Time                     4       IP Address Lease Time                             [RFC2132] 
52        Overload                         1       Overload "sname" or "file"                        [RFC2132] 
53        DHCP Msg Type                    1       DHCP Message Type                                 [RFC2132] 
54        DHCP Server Id                   4       DHCP Server Identification                        [RFC2132] 
55        Parameter List                   N       Parameter Request List                            [RFC2132] 
56        DHCP Message                     N       DHCP Error Message                                [RFC2132] 
57        DHCP Max Msg Size                2       DHCP Maximum Message Size                         [RFC2132] 
58        Renewal Time                     4       DHCP Renewal (T1) Time                            [RFC2132] 
59        Rebinding Time                   4       DHCP Rebinding (T2) Time                          [RFC2132] 
60        Class Id                         N       Class Identifier                                  [RFC2132] 
61        Client Id                        N       Client Identifier                                 [RFC2132] 
62        Netware/IP Domain                N       Netware/IP Domain Name                            [RFC2242] 
63        Netware/IP Option                N       Netware/IP sub Options                            [RFC2242] 
64        NIS-Domain-Name                  N       NIS+ v3 Client Domain Name                        [RFC2132] 
65        NIS-Server-Addr                  N       NIS+ v3 Server Addresses                          [RFC2132] 
66        Server-Name                      N       TFTP Server Name                                  [RFC2132] 
67        Bootfile-Name                    N       Boot File Name                                    [RFC2132] 
68        Home-Agent-Addrs                 N       Home Agent Addresses                              [RFC2132] 
69        SMTP-Server                      N       Simple Mail Server Addresses                      [RFC2132] 
70        POP3-Server                      N       Post Office Server Addresses                      [RFC2132] 
71        NNTP-Server                      N       Network News Server Addresses                     [RFC2132] 
72        WWW-Server                       N       WWW Server Addresses                              [RFC2132] 
73        Finger-Server                    N       Finger Server Addresses                           [RFC2132] 
74        IRC-Server                       N       Chat Server Addresses                             [RFC2132] 
75        StreetTalk-Server                N       StreetTalk Server Addresses                       [RFC2132] 
76        STDA-Server                      N       ST Directory Assist. Addresses                    [RFC2132] 
77        User-Class                       N       User Class Information                            [RFC3004] 
78        Directory Agent                  N       directory agent information                       [RFC2610] 
79        Service Scope                    N       service location agent scope                      [RFC2610] 
80        Rapid Commit                     0       Rapid Commit                                      [RFC4039] 
81        Client FQDN                      N       Fully Qualified Domain Name                       [RFC4702] 
82        Relay Agent Information          N       Relay Agent Information                           [RFC3046] 
83        iSNS                             N       Internet Storage Name Service                     [RFC4174]
84        REMOVED/Unassigned                                                                         [RFC3679]
85        NDS Servers                      N       Novell Directory Services                         [RFC2241] 
86        NDS Tree Name                    N       Novell Directory Services                         [RFC2241] 
87        NDS Context                      N       Novell Directory Services                         [RFC2241] 
88        BCMCS Controller Domain Name list                                                          [RFC4280]
89        BCMCS Controller IPv4 address option                                                       [RFC4280]
90        Authentication                   N       Authentication                                    [RFC3118] 
91        client-last-transaction-time option                                                        [RFC4388]  
92        associated-ip option                                                                       [RFC4388] 
93        Client System                    N       Client System Architecture                        [RFC4578] 
94        Client NDI                       N       Client Network Device Interface                   [RFC4578]
95        LDAP                             N       Lightweight Directory Access Protocol             [RFC3679] 
96        REMOVED/Unassigned                                                                         [RFC3679] 
97        UUID/GUID                        N       UUID/GUID-based Client Identifier                 [RFC4578]
98        User-Auth                        N       Open Group's User Authentication                  [RFC2485] 
99        GEOCONF_CIVIC                                                                              [RFC4776]
100       PCode                            N       IEEE 1003.1 TZ String                             [RFC4833]
101       TCode                            N       Reference to the TZ Database                      [RFC4833] 
102-107   REMOVED/Unassigned                                                                         [RFC3679]
108       REMOVED/Unassigned                                                                         [RFC3679]
109       Unassigned                                                                                 [RFC3679]
110       REMOVED/Unassigned                                                                         [RFC3679]
111       Unassigned                                                                                 [RFC3679]
112       Netinfo Address                  N       NetInfo Parent Server Address                     [RFC3679] 
113       Netinfo Tag                      N       NetInfo Parent Server Tag                         [RFC3679] 
114       URL                              N       URL                                               [RFC3679]
115       REMOVED/Unassigned                                                                         [RFC3679] 
116       Auto-Config                      N       DHCP Auto-Configuration                           [RFC2563] 
117       Name Service Search              N       Name Service Search                               [RFC2937] 
118       Subnet Selection Option          4       Subnet Selection Option                           [RFC3011] 
119       Domain Search                    N       DNS domain search list                            [RFC3397] 
120       SIP Servers DHCP Option          N       SIP Servers DHCP Option                           [RFC3361] 
121       Classless Static Route Option    N       Classless Static Route Option                     [RFC3442] 
122       CCC                              N       CableLabs Client Configuration                    [RFC3495]
123       GeoConf Option                   16      GeoConf Option                                    [RFC3825]
124       V-I Vendor Class                         Vendor-Identifying Vendor Class                   [RFC3925]
125       V-I Vendor-Specific Information          Vendor-Identifying Vendor-Specific Information    [RFC3925]
126       Removed/Unassigned                                                                         [RFC3679]
127       Removed/Unassigned                                                                         [RFC3679]
128       PXE - undefined (vendor specific)                                                          [RFC4578]
128       Etherboot signature. 6 bytes: E4:45:74:68:00:00	
128       DOCSIS "full security" server IP address	
128       TFTP Server IP address (for IP Phone software load)	
129       PXE - undefined (vendor specific)                                                          [RFC4578]
129       Kernel options. Variable length string	
129       Call Server IP address 	
130       PXE - undefined (vendor specific)                                                          [RFC4578]
130       Ethernet interface. Variable length string.	
130       Discrimination string (to identify vendor)	
131       PXE - undefined (vendor specific)                                                          [RFC4578]
131       Remote statistics server IP address 	
132       PXE - undefined (vendor specific)                                                          [RFC4578]
132       IEEE 802.1Q VLAN ID 	
133       PXE - undefined (vendor specific)                                                          [RFC4578]
133       IEEE 802.1D/p Layer 2 Priority	
134       PXE - undefined (vendor specific)                                                          [RFC4578]
134       Diffserv Code Point (DSCP) for VoIP signalling and media streams	
135       PXE - undefined (vendor specific)                                                          [RFC4578]
135       HTTP Proxy for phone-specific applications	
136       OPTION_PANA_AGENT                                                                          [RFC5192]
137       OPTION_V4_LOST                                                                             [RFC5223]
138       OPTION_CAPWAP_AC_V4              N       CAPWAP Access Controller addresses                [RFC-ietf-capwap-dhc-ac-option-02.txt]
139-149   Unassigned                                                                                 [RFC3942]
150       TFTP server address (Tentatively Assigned - 2005-06-23)
150       Etherboot	
150       GRUB configuration path name	
151-174   Unassigned                                                                                 [RFC3942]
175       Etherboot (Tentatively Assigned - 2005-06-23)
176       IP Telephone (Tentatively Assigned - 2005-06-23)
177       Etherboot (Tentatively Assigned - 2005-06-23)
177       PacketCable and CableHome (replaced by 122)	
178-207   Unassigned                                                                                 [RFC3942]
208       PXELINUX Magic                   4       magic string = F1:00:74:7E                        [RFC5071] Deprecated
209       Configuration File               N       Configuration file                                [RFC5071]
210       Path Prefix                      N       Path Prefix Option                                [RFC5071]
211       Reboot Time                      4       Reboot Time                                       [RFC5071]
212-219   Unassigned
220       Subnet Allocation Option (Tentatively Assigned - 2005-06-23)
221       Virtual Subnet Selection Option (Tentatively Assigned - 2005-06-23)
222-223   Unassigned                                                                                 [RFC3942]
224-254   Reserved (Private Use)
255       End                              0         None                                            [RFC2132] 

Sub-registry: DHCP Message Type 53 Values 
Reference: [RFC2939]
Registration Procedures: IETF Consensus

Registry:
Value  Message Type            Reference
-----  ----------------------  ---------
1      DHCPDISCOVER            [RFC2132]
2      DHCPOFFER               [RFC2132]
3      DHCPREQUEST             [RFC2132]
4      DHCPDECLINE             [RFC2132]
5      DHCPACK                 [RFC2132]
6      DHCPNAK                 [RFC2132]
7      DHCPRELEASE             [RFC2132]
8      DHCPINFORM              [RFC2132]
9      DHCPFORCERENEW          [RFC3203]
10     DHCPLEASEQUERY          [RFC4388]
11     DHCPLEASEUNASSIGNED     [RFC4388]
12     DHCPLEASEUNKNOWN        [RFC4388]
13     DHCPLEASEACTIVE         [RFC4388]

Sub-registry: Network/IP Option Type 63 Sub-Option Codes 
Reference: [RFC2242]
Registration Procedures: Not defined

Registry:
Value   Message Type                  Reference
------  ----------------------------  ---------
1       NWIP_DOES_NOT_EXIST           [RFC2242] 
2       NWIP_EXIST_IN_OPTIONS_AREA    [RFC2242]
3       NWIP_EXIST_IN_SNAME_FILE      [RFC2242]
4       NWIP_EXIST_BUT_TOO_BIG        [RFC2242]
5       NSQ_BROADCAST                 [RFC2242]
6       PREFERRED_DSS                 [RFC2242]
7       NEAREST_NWIP_SERVER           [RFC2242]
8       AUTORETRIES                   [RFC2242]
9       AUTORETRY_SECS                [RFC2242]
10      NWIP_1_1                      [RFC2242]
11      PRIMARY_DSS                   [RFC2242]
12-255  Unassigned

Sub-registry: DHCP Cablelabs Client Configuration Option Type 122 Sub-Option Codes 
Reference: [RFC3495]
Registration Procedures: IETF Consensus

Registry:
Code    Sub-Option Description                      Reference 
------  ------------------------------------------  --------- 
1       TSP's Primary DHCP Server Address           [RFC3495] 
2       TSP's Secondary DHCP Server Address         [RFC3495] 
3       TSP's Provisioning Server Address           [RFC3495]
4       TSP's AS-REQ/AS-REP Backoff and Retry       [RFC3495]
5       TSP's AP-REQ/AP-REP Backoff and Retry       [RFC3495]
6       TSP's Kerberos Realm Name                   [RFC3495]
7       TSP's Ticket Granting Server Utilization    [RFC3495]
8       TSP's Provisioning Timer Value              [RFC3495]
9       TSP's Security Ticket Control               [RFC3594] 
10      KDC Server Address                          [RFC3634]
11-255  Unassigned


Sub-registry: GeoConf Option fields (Value 123) - The Altitude (AT) field
Reference: [RFC3825]
Registration Procedures: Standards Action

Value  Altitude Field Description                      Reference
-----  ----------------------------------------------  ---------
1      Meters - in 2s-complement fixed-point 22-bit    [RFC3825]
       integer part with 8-bit fraction 
2      Floors - in 2s-complement fixed-point 22-bit    [RFC3825]
       integer part with 8-bit fraction


Sub-registry: GeoConf Option fields (Value 123) - The Datum field
Reference: [RFC3825]
Registration Procedures: Standards Action

Value  Datum Field Description                        Reference
-----  ---------------------------------------------- ---------
1      WGS 84 - (Geographical 3D)                     [RFC3825]
       World Geodesic System 1984, CRS Code 4327, 
       Prime Meridian Name: Greenwich

2      NAD83 - North American Datum 1983,             [RFC3825]
       CRS Code 4269, Prime Meridian Name: Greenwich; 
       The associated vertical datum is the North 
       American Vertical Datum of 1988 (NAVD88)

       This datum pair to be used when referencing 
       locations on land, not near tidal water (which 
       would use Datum = 3 below)

3      NAD83 - North American Datum 1983,             [RFC3825]
       CRS Code 4269, Prime Meridian Name: Greenwich; 
       The associated vertical datum is Mean Lower 
       Low Water (MLLW)

       This datum pair to be used when referencing 
       locations on water/sea/ocean


Registry Name: CableLabs Client Configuration Option Ticket Control Mask Bit Definitions
Reference: [RFC3594] 
Registration Procedures: IETF Consensus

Registry:
Bit     Description                             Reference
------  --------------------------------------  ---------
0       the PacketCable Provisioning Server     [RFC3594] 
        used by the CCD.  
1       the group of all PacketCable Call       [RFC3594] 
        Management Servers used by the CCD. 
2-15    Reserved and MUST be set to 0.   


Registry Name: DHCP Relay Agent Sub-Option Codes
Reference: [RFC3046]
Registration Procedures: IETF Consensus

Registry:
Code    Sub-Option Description                   Reference
------  ---------------------------------------  ---------
1       Agent Circuit ID Sub-option              [RFC3046]
2       Agent Remote ID Sub-option               [RFC3046]
3       Sub-option 3 is reserved and should      [Droms]
        not be assigned at this time;
        proprietary and incompatible usages
        of this sub-option value have been
        seen limited deployment.
4       DOCSIS Device Class Suboption            [RFC3256]
5       Link selection Sub-option                [RFC3527]
6       Subscriber-ID Suboption                  [RFC3993]
7       RADIUS Attributes Sub-option             [RFC4014]
8       Authentication Suboption                 [RFC4030] 
9       Vendor-Specific Information Suboption    [RFC4243]
10      Relay Agent Flags                        [RFC5010]
11      Server Identifier Override Suboption     [RFC5107]


Sub-registry: Authentication Suboption (value 8) - Algorithm identifier values
Reference: [RFC4030]
Registration Procedures: IETF consensus

Value  Algorithm                            Reference
-----  ---------------------------------    ---------
0      Reserved                             [RFC4030] 
1      HMAC-SHA1 keyed hash                 [RFC4030] 


Sub-registry: Authentication Suboption (value 8) - Replay Detection Method (RDM) identifier values 
Reference: [RFC4030]
Registration Procedures: IETF consensus

Value  Algorithm                                          Reference
-----  -------------------------------------------------  ---------
0      Reserved                                           [RFC4030] 
1      use of a monotonically increasing counter value    [RFC4030] 
          

References
----------
[RFC951]  Croft, B., and J. Gilmore, "BOOTSTRAP Protocol (BOOTP)",
          RFC-951, Stanford and SUN Microsytems, September 1985.

[RFC2131]  Droms, R., "Dynamic Host Configuration Protocol", Bucknell
           University, March 1997.

[RFC2132]  Alexander, S., and R. Droms, "DHCP Options and BOOTP Vendor
           Extensions", Silicon Graphics, Inc., Bucknell University,
           March 1997.

[RFC2241]  D. Provan, "DHCP Options for Novell Directory Services", 
           RFC 2241, November 1997.

[RFC2242]  R. Droms and K. Fong, "NetWare/IP Domain Name and 
           Information", RFC 2242, November 1997.

[RFC2485]  S. Drach, "DHCP Option for The Open Group's User Authentication 
           Protocol", RFC 2485, January 1999.

[RFC2489]  Droms, R., "Procedure for Defining New DHCP Options",
           BCP 29, RFC 2489, January 1999.

[RFC2563]  R. Troll, "DHCP Option to Disable Stateless Auto-Configuration 
           in IPv4 Clients, RFC 2563, May 1999.

[RFC2610]  C. Perkins and E. Guttman, "DHCP Options for Service Location 
           Protocol", RFC 2610, June 1999.

[RFC2937]  C. Smith, "The Name Service Search Option for DHCP", RFC 2937,
           September 2000.

[RFC2939]  R. Droms, "Procedures and IANA Guidelines for Definition of
           New DHCP Options and Message Types", RFC 2939, September 2000.

[RFC3004]  G. Stump, R. Droms, Y. Gu, R. Vyaghrapuri, A. Demirtjis, 
           B. Beser, and J. Privat, "The User Class Option for DHCP", 
           RFC 3004, November 2000.

[RFC3011]  G. Waters, "The IPv4 Subnet Selection Option for DHCP",
           RFC 3011, November 2000.  

[RFC3046]  M. Patrick, "DHCP Relay Agent Information Option", 
           RFC 3046, January 2001.

[RFC3118]  R. Droms and W. Arbaugh, "Authentication for DHCP Messages",
           RFC 3118, June 2001.

[RFC3203]  Y. T'Jones, C. Hublet, and P. De Schrijver, "DHCP 
           Reonfigure Extension", RFC 3203, December 2001.

[RFC3256]  D. Jones and R. Woundy, "The DOCSIS Device Class DHCP 
           Relay Agent Information Sub-option", RFC 3256,
           April 2002.

[RFC3361]  H. Schulzrinne, "DHCPv4 Option for SIP Servers", RFC 3361,
           August 2002.

[RFC3397]  B. Aboba and S. Cheshire, "Dynamic Host Configuration Protocol 
           (DHCP) Domain Search Option", RFC 3397, November 2002.

[RFC3442]  T. Lemon, S. Cheshire, and B. Volz, "The Classless Static 
           Route Option for DHCPv4", RFC 3442, December 2002.

[RFC3495]  B. Beser and P. Duffy, "DHCP Option for CableLabs Client 
           Configuration", RFC 3495, March 2003.

[RFC3527]  K. Kinnear, M. Stapp, R. Johnson, and J. Kumarasamy, 
           "Link Selection sub-option for the Relay Agent Information 
           Option for DHCPv4", RFC 3527, April 2003.

[RFC3594]  P. Duffy, "PacketCable Security Ticket Control Sub-option for 
           the DHCP CableLabs Client Configuration Option", RFC 3594,
           September 2003.

[RFC3679]  R. Droms, "Unused DHCP Option Codes", RFC 3679, January 2004.

[RFC3634]  K. Luehrs, R. Woundy, J. Bevilacqua, N. Davoust,
           "Key Distribution Center (KDC) Server Address Sub-option for
           the Dynamic Host Configuration Protocol (DHCP) CableLabs Client 
           Configuration (CCC) Option", RFC3634, December 2003.

[RFC3825]  J. Polk, J. Schnizlein, and M. Linsner, "Dynamic Host Configuration 
           Protocol Option for Coordinate-based Location Configuration 
           Information", RFC 3825, July 2004.

[RFC3925]  J. Littlefield, "Vendor-Identifying Vendor Options for DHCPv4",
           RFC 3925, October 2004.

[RFC3942]  B. Volz, "Reclassifying DHCPv4 Options", RFC 3942, November 2004.

[RFC3993]  R. Johnson, T. Palaniappan, and M. Stapp, "Subscriber-ID Suboption 
           for the DHCP Relay Agent Option", RFC 3993, March 2005.

[RFC4014]  R. Droms and J. Schnizlein, "RADIUS Attributes Sub-option for the 
           DHCP Relay Agent Information Option", RFC 4014, February 2005.

[RFC4030]  M. Stapp and T. Lemon, "The Authentication Suboption for the 
           DHCP Relay Agent Option", RFC 4030, March 2005.

[RFC4039]  S. Park, P. Kim, and B. Volz, "Rapid Commit Option for DHCPv4", 
           RFC 4039, March 2005.

[RFC4174]  C. Monia, J. Tseng, and K. Gibbons, "The IPv4 DHCP Option for 
           the Internet Storage Name Service", RFC 4174, September 2005.

[RFC4243]  M. Stapp, R. Johnson, and T. Palaniappan, "Vendor-Specific Information 
           Suboption for the DHCP Relay Agent Option", RFC 4243, December 2005.

[RFC4280]  K. Chowdhury, P. Yegani and L. Madour, "DHCP Options for Broadcast 
           and Multicast Control Servers", RFC 4280, November 2005.

[RFC4388]  R. Woundy and Kim Kinnear, "DHCP Lease Query", RFC 4388, February 2006.
 
[RFC4578]  M. Johnston and S. Venaas, "DHCP Options for the Intel Preboot eXecution
           Environment (PXE)", RFC 4578, November 2006.

[RFC4702]  M. Stapp, B. Volz and Y. Rekhter, "The DHCP Client FQDN Option", 
           RFC 4702, October 2006.

[RFC4776]  H. Schulzrinne, "Dynamic Host Configuration Protocol (DHCPv4 and DHCPv6) 
           Option for Civic Addresses Configuration Information", RFC 4776, November 2006.

[RFC4833]  E. Lear, P. Eggert, "A Timezone Option for DHCP", RFC 4833,
            April 2007.

[RFC5010]  K. Kinnear, M. Normoyle and M. Stapp, "DHCPv4 Relay Agent Flags Suboption", 
           RFC 5010, September 2007.                      

[RFC5071]  D. Hankins, "Dynamic Host Configuration Protocol Options Used by PXELINUX",
           RFC 5071, December 2007.

[RFC5107]  R. Johnson, J. Jumarasamy, K. Kinnear, M. Stapp, "DHCP Server Identifier 
           Override Suboption", RFC 5107, February 2008.

[RFC5192]  L. Morand, A. Yegin, S. Kumar, S. Madanapalli, "DHCP options for PANA 
           Authentication Agents", RFC 5192, May 2008.

[RFC5223]  H. Schulzrinne, J. Polk, H. Tschofenig, "A Dynamic Host Configuration 
           Protocol (DHCP) based Location-to-Service Translation Protocol (LoST) 
           Discovery Procedure", RFC 5223, August 2008.

[RFC-ietf-capwap-dhc-ac-option-02.txt]
           P. Calhoun, "CAPWAP Access Controller DHCP Option", RFC XXXX, Month Year.


People
------
[Droms]  Ralph Droms, <rdroms&cisco.com>, January 2001.

[]

