DHCP and BOOTP Parameters

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

Last Updated - 2008-10-28

• This Page was Taken From: http://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xhtml

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

This registry is also available in XML and plain text formats.

BOOTP Vendor Extensions and DHCP Options

Registration Procedures

IETF Consensus

Reference

[RFC2939]

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.

Tag	Name	Data 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 (note: deprecated by 100 and 101)	[RFC2132]
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]
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]

DHCP Message Type 53 Values

Registration Procedures

IETF Consensus

Reference

[RFC2939]

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]

Network/IP Option Type 63 Sub-Option Codes

Registration Procedures

Not defined

Reference

[RFC2242]

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

DHCP Cablelabs Client Configuration Option Type 122 Sub-Option Codes

Registration Procedures

IETF Consensus

Reference

[RFC3495]

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

GeoConf Option fields (Value 123) - The Altitude (AT) field

Registration Procedures

Standards Action

Reference

[RFC3825]

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

GeoConf Option fields (Value 123) - The Datum field

Registration Procedures

Standards Action

Reference

[RFC3825]

Value	Datum Field Description	Reference
1	WGS 84 - (Geographical 3D) World Geodesic System 1984, CRS Code 4327, Prime Meridian Name: Greenwich	[RFC3825]
2	NAD83 - North American Datum 1983, 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)	[RFC3825]
3	NAD83 - North American Datum 1983, 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	[RFC3825]

CableLabs Client Configuration Option Ticket Control Mask Bit Definitions

Registration Procedures

IETF Consensus

Reference

[RFC3594]

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

DHCP Relay Agent Sub-Option Codes

Registration Procedures

IETF Consensus

Reference

[RFC3046]

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 not be assigned at this time; proprietary and incompatible usages of this sub-option value have been seen limited deployment.	[Ralph_Droms]
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]

Authentication Suboption (value 8) - Algorithm identifier values

Registration Procedures

IETF consensus

Reference

[RFC4030]

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

Authentication Suboption (value 8) - Replay Detection Method (RDM) identifier values

Registration Procedures

IETF consensus

Reference

[RFC4030]

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