DHCP and BOOTP Parameters

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

Last Updated - 2008-10-28


Note 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]