DHCP Options
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From: http://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xml
Dynamic Host Configuration Protocol (DHCP) and Bootstrap Protocol (BOOTP) Parameters
- Last Updated
- 2012-07-06
- 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 plain text.
Registries included below
- BOOTP Vendor Extensions and DHCP Options
- DHCP Message Type 53 Values
- NetWare/IP Option Type 63 Sub-Option Codes
- DHCP Cablelabs Client Configuration Option Type 122 Sub-Option Codes
- Altitude Type Registry
- Datum Registry
- GeoLoc Option Version Registry
- 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
- IEEE 802.21 Service Type (MoS DHCPv4 Address and FQDN Sub-Options)
- NTP Time Source Suboptions
- VSS Type Options
BOOTP Vendor Extensions and DHCP Options
- Registration Procedures
IETF Consensus
- Reference
- [
- RFC2939]
- Note
The Bootstrap Protocol (BOOTP) [RFC951] describes an IP/UDP bootstrapprotocol (BOOTP) which allows a diskless client machine to discoverits own IP address, the address of a server host, and the name of afile to be loaded into memory and executed. The Dynamic HostConfiguration Protocol (DHCP) [RFC2131] provides a framework forautomatic configuration of IP hosts. The document "DHCP Options andBOOTP Vendor Information Extensions" [RFC2132] describes options forDHCP, some of which can also be used with BOOTP. Additional DHCPoptions are described in other RFCs, as documented in this registry.
Tag | Name | Data Length | Meaning | Reference | 0Pad0None[RFC2132]1Subnet Mask4Subnet Mask Value[RFC2132]2Time Offset4Time Offset in Seconds from UTC (note: deprecated by 100 and 101)[RFC2132]3RouterNN/4 Router addresses[RFC2132]4Time ServerNN/4 Timeserver addresses[RFC2132]5Name ServerNN/4 IEN-116 Server addresses[RFC2132]6Domain ServerNN/4 DNS Server addresses[RFC2132]7Log ServerNN/4 Logging Server addresses[RFC2132]8Quotes ServerNN/4 Quotes Server addresses[RFC2132]9LPR ServerNN/4 Printer Server addresses[RFC2132]10Impress ServerNN/4 Impress Server addresses[RFC2132]11RLP ServerNN/4 RLP Server addresses[RFC2132]12HostnameNHostname string[RFC2132]13Boot File Size2Size of boot file in 512 byte chunks[RFC2132]14Merit Dump FileNClient to dump and name the file to dump it to[RFC2132]15Domain NameNThe DNS domain name of the client[RFC2132]16Swap ServerNSwap Server address[RFC2132]17Root PathNPath name for root disk[RFC2132]18Extension FileNPath name for more BOOTP info[RFC2132]19Forward On/Off1Enable/Disable IP Forwarding[RFC2132]20SrcRte On/Off1Enable/Disable Source Routing[RFC2132]21Policy FilterNRouting Policy Filters[RFC2132]22Max DG Assembly2Max Datagram Reassembly Size[RFC2132]23Default IP TTL1Default IP Time to Live[RFC2132]24MTU Timeout4Path MTU Aging Timeout[RFC2132]25MTU PlateauNPath MTU Plateau Table[RFC2132]26MTU Interface2Interface MTU Size[RFC2132]27MTU Subnet1All Subnets are Local[RFC2132]28Broadcast Address4Broadcast Address[RFC2132]29Mask Discovery1Perform Mask Discovery[RFC2132]30Mask Supplier1Provide Mask to Others[RFC2132]31Router Discovery1Perform Router Discovery[RFC2132]32Router Request4Router Solicitation Address[RFC2132]33Static RouteNStatic Routing Table[RFC2132]34Trailers1Trailer Encapsulation[RFC2132]35ARP Timeout4ARP Cache Timeout[RFC2132]36Ethernet1Ethernet Encapsulation[RFC2132]37Default TCP TTL1Default TCP Time to Live[RFC2132]38Keepalive Time4TCP Keepalive Interval[RFC2132]39Keepalive Data1TCP Keepalive Garbage[RFC2132]40NIS DomainNNIS Domain Name[RFC2132]41NIS ServersNNIS Server Addresses[RFC2132]42NTP ServersNNTP Server Addresses[RFC2132]43Vendor SpecificNVendor Specific Information[RFC2132]44NETBIOS Name SrvNNETBIOS Name Servers[RFC2132]45NETBIOS Dist SrvNNETBIOS Datagram Distribution[RFC2132]46NETBIOS Node Type1NETBIOS Node Type[RFC2132]47NETBIOS ScopeNNETBIOS Scope[RFC2132]48X Window FontNX Window Font Server[RFC2132]49X Window ManagerNX Window Display Manager[RFC2132]50Address Request4Requested IP Address[RFC2132]51Address Time4IP Address Lease Time[RFC2132]52Overload1Overload "sname" or "file"[RFC2132]53DHCP Msg Type1DHCP Message Type[RFC2132]54DHCP Server Id4DHCP Server Identification[RFC2132]55Parameter ListNParameter Request List[RFC2132]56DHCP MessageNDHCP Error Message[RFC2132]57DHCP Max Msg Size2DHCP Maximum Message Size[RFC2132]58Renewal Time4DHCP Renewal (T1) Time[RFC2132]59Rebinding Time4DHCP Rebinding (T2) Time[RFC2132]60Class IdNClass Identifier[RFC2132]61Client IdNClient Identifier[RFC2132]62NetWare/IP DomainNNetWare/IP Domain Name[RFC2242]63NetWare/IP OptionNNetWare/IP sub Options[RFC2242]64NIS-Domain-NameNNIS+ v3 Client Domain Name[RFC2132]65NIS-Server-AddrNNIS+ v3 Server Addresses[RFC2132]66Server-NameNTFTP Server Name[RFC2132]67Bootfile-NameNBoot File Name[RFC2132]68Home-Agent-AddrsNHome Agent Addresses[RFC2132]69SMTP-ServerNSimple Mail Server Addresses[RFC2132]70POP3-ServerNPost Office Server Addresses[RFC2132]71NNTP-ServerNNetwork News Server Addresses[RFC2132]72WWW-ServerNWWW Server Addresses[RFC2132]73Finger-ServerNFinger Server Addresses[RFC2132]74IRC-ServerNChat Server Addresses[RFC2132]75StreetTalk-ServerNStreetTalk Server Addresses[RFC2132]76STDA-ServerNST Directory Assist. Addresses[RFC2132]77User-ClassNUser Class Information[RFC3004]78Directory AgentNdirectory agent information[RFC2610]79Service ScopeNservice location agent scope[RFC2610]80Rapid Commit0Rapid Commit[RFC4039]81Client FQDNNFully Qualified Domain Name[RFC4702]82Relay Agent InformationNRelay Agent Information[RFC3046]83iSNSNInternet Storage Name Service[RFC4174]84REMOVED/Unassigned [RFC3679]85NDS ServersNNovell Directory Services[RFC2241]86NDS Tree NameNNovell Directory Services[RFC2241]87NDS ContextNNovell Directory Services[RFC2241]88BCMCS Controller Domain Name list [RFC4280]89BCMCS Controller IPv4 address option [RFC4280]90AuthenticationNAuthentication[RFC3118]91client-last-transaction-time option [RFC4388]92associated-ip option [RFC4388]93Client SystemNClient System Architecture[RFC4578]94Client NDINClient Network Device Interface[RFC4578]95LDAPNLightweight Directory Access Protocol[RFC3679]96REMOVED/Unassigned [RFC3679]97UUID/GUIDNUUID/GUID-based Client Identifier[RFC4578]98User-AuthNOpen Group's User Authentication[RFC2485]99GEOCONF_CIVIC [RFC4776]100PCodeNIEEE 1003.1 TZ String[RFC4833]101TCodeNReference to the TZ Database[RFC4833]102-107REMOVED/Unassigned [RFC3679]108REMOVED/Unassigned [RFC3679]109Unassigned [RFC3679]110REMOVED/Unassigned [RFC3679]111Unassigned [RFC3679]112Netinfo AddressNNetInfo Parent Server Address[RFC3679]113Netinfo TagNNetInfo Parent Server Tag[RFC3679]114URLNURL[RFC3679]115REMOVED/Unassigned [RFC3679]116Auto-ConfigNDHCP Auto-Configuration[RFC2563]117Name Service SearchNName Service Search[RFC2937]118Subnet Selection Option4Subnet Selection Option[RFC3011]119Domain SearchNDNS domain search list[RFC3397]120SIP Servers DHCP OptionNSIP Servers DHCP Option[RFC3361]121Classless Static Route OptionNClassless Static Route Option[RFC3442]122CCCNCableLabs Client Configuration[RFC3495]123GeoConf Option16GeoConf Option[RFC6225]124V-I Vendor Class Vendor-Identifying Vendor Class[RFC3925]125V-I Vendor-Specific Information Vendor-Identifying Vendor-Specific Information[RFC3925]126Removed/Unassigned [RFC3679]127Removed/Unassigned [RFC3679]128PXE - undefined (vendor specific) [RFC4578]128Etherboot signature. 6 bytes: E4:45:74:68:00:00 128DOCSIS "full security" server IP address 128TFTP Server IP address (for IP Phone software load) 129PXE - undefined (vendor specific) [RFC4578]129Kernel options. Variable length string 129Call Server IP address 130PXE - undefined (vendor specific) [RFC4578]130Ethernet interface. Variable length string. 130Discrimination string (to identify vendor) 131PXE - undefined (vendor specific) [RFC4578]131Remote statistics server IP address 132PXE - undefined (vendor specific) [RFC4578]132IEEE 802.1Q VLAN ID 133PXE - undefined (vendor specific) [RFC4578]133IEEE 802.1D/p Layer 2 Priority 134PXE - undefined (vendor specific) [RFC4578]134Diffserv Code Point (DSCP) for VoIP signalling and media streams 135PXE - undefined (vendor specific) [RFC4578]135HTTP Proxy for phone-specific applications 136OPTION_PANA_AGENT [RFC5192]137OPTION_V4_LOST [RFC5223]138OPTION_CAPWAP_AC_V4NCAPWAP Access Controller addresses[RFC5417]139OPTION-IPv4_Address-MoSNa series of suboptions[RFC5678]140OPTION-IPv4_FQDN-MoSNa series of suboptions[RFC5678]141SIP UA Configuration Service DomainsNList of domain names to search for SIP User Agent Configuration[RFC6011]142OPTION-IPv4_Address-ANDSFNANDSF IPv4 Address Option for DHCPv4[RFC6153]143OPTION-IPv6_Address-ANDSFNANDSF IPv6 Address Option for DHCPv6[RFC6153]144GeoLoc16Geospatial Location with Uncertainty[RFC6225]145FORCERENEW_NONCE_CAPABLE1Forcerenew Nonce Capable[RFC-ietf-dhc-forcerenew-nonce-07]146-149Unassigned [RFC3942]150TFTP server address [RFC5859]150Etherboot 150GRUB configuration path name 151-174Unassigned [RFC3942]175Etherboot (Tentatively Assigned - 2005-06-23) 176IP Telephone (Tentatively Assigned - 2005-06-23) 177Etherboot (Tentatively Assigned - 2005-06-23) 177PacketCable and CableHome (replaced by 122) 178-207Unassigned [RFC3942]208PXELINUX Magic4magic string = F1:00:74:7E[RFC5071][Deprecated]209Configuration FileNConfiguration file[RFC5071]210Path PrefixNPath Prefix Option[RFC5071]211Reboot Time4Reboot Time[RFC5071]212OPTION_6RD18 + NOPTION_6RD with N/4 6rd BR addresses[RFC5969]213OPTION_V4_ACCESS_DOMAINNAccess Network Domain Name[RFC5986]214-219Unassigned 220Subnet Allocation OptionNSubnet Allocation Option[draft-ietf-dhc-subnet-alloc-13]221Virtual Subnet Selection (VSS) Option [RFC6607]222-223Unassigned [RFC3942]224-254Reserved (Private Use) 255End0None[RFC2132]DHCP Message Type 53 Values
- Registration Procedures
IETF Consensus
- Reference
- [
- RFC2939]
Value | Message Type | Reference | 1DHCPDISCOVER[RFC2132]2DHCPOFFER[RFC2132]3DHCPREQUEST[RFC2132]4DHCPDECLINE[RFC2132]5DHCPACK[RFC2132]6DHCPNAK[RFC2132]7DHCPRELEASE[RFC2132]8DHCPINFORM[RFC2132]9DHCPFORCERENEW[RFC3203]10DHCPLEASEQUERY[RFC4388]11DHCPLEASEUNASSIGNED[RFC4388]12DHCPLEASEUNKNOWN[RFC4388]13DHCPLEASEACTIVE[RFC4388]NetWare/IP Option Type 63 Sub-Option Codes
- Registration Procedures
Not defined
- Reference
- [
- RFC2242]
Value | Message Type | Reference | 1NWIP_DOES_NOT_EXIST[RFC2242]2NWIP_EXIST_IN_OPTIONS_AREA[RFC2242]3NWIP_EXIST_IN_SNAME_FILE[RFC2242]4NWIP_EXIST_BUT_TOO_BIG[RFC2242]5NSQ_BROADCAST[RFC2242]6PREFERRED_DSS[RFC2242]7NEAREST_NWIP_SERVER[RFC2242]8AUTORETRIES[RFC2242]9AUTORETRY_SECS[RFC2242]10NWIP_1_1[RFC2242]11PRIMARY_DSS[RFC2242]12-255Unassigned DHCP Cablelabs Client Configuration Option Type 122 Sub-Option Codes
- Registration Procedures
IETF Consensus
- Reference
- [
- RFC3495]
Code | Sub-Option Description | Reference | 1TSP's Primary DHCP Server Address[RFC3495]2TSP's Secondary DHCP Server Address[RFC3495]3TSP's Provisioning Server Address[RFC3495]4TSP's AS-REQ/AS-REP Backoff and Retry[RFC3495]5TSP's AP-REQ/AP-REP Backoff and Retry[RFC3495]6TSP's Kerberos Realm Name[RFC3495]7TSP's Ticket Granting Server Utilization[RFC3495]8TSP's Provisioning Timer Value[RFC3495]9TSP's Security Ticket Control[RFC3594]10KDC Server Address[RFC3634]11-255Unassigned Altitude Type Registry
- Registration Procedures
Standards Action
- Reference
- [
- RFC6225]
Type | Altitude Field Description | Reference | 0No known altitude[RFC6225]1Altitude in meters[RFC6225]2Altitude in floors[RFC6225]3-15Unassigned Datum Registry
- Registration Procedures
Standards Action
- Reference
- [
- RFC6225]
Datum | Datum Field Description | Reference | 0Reserved[RFC6225]1Vertical datum WGS 84 defined by EPSG CRS Code 4327[RFC6225]2Vertical datum NAD83 defined by EPSG CRS Code 4269 with North American Vertical Datum of 1988 (NAVD88)[RFC6225]3Vertical datum NAD83 defined by EPSG CRS Code 4269 with Mean Lower Low Water (MLLW) as associated vertical datum[RFC6225]4-7Unassigned GeoLoc Option Version Registry
- Registration Procedures
Standards Action
- Reference
- [
- RFC6225]
Version | Description | Reference | 0Reserved[RFC6225]1Implementations utilizing uncertainty parameters for both DHCPv4 and DHCPv6 GeoLoc options[RFC6225]2-3Unassigned CableLabs Client Configuration Option Ticket Control Mask Bit Definitions
- Registration Procedures
IETF Consensus
- Reference
- [
- RFC3594]
Bit | Description | Reference | 0the PacketCable Provisioning Server used by the CCD.[RFC3594]1the group of all PacketCable Call Management Servers used by the CCD.[RFC3594]2-15Reserved and MUST be set to 0. DHCP Relay Agent Sub-Option Codes
- Registration Procedures
IETF Consensus
- Reference
- [
- RFC3046]
Code | Sub-Option Description | Reference | 1Agent Circuit ID Sub-option[RFC3046]2Agent Remote ID Sub-option[RFC3046]3Sub-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]4DOCSIS Device Class Suboption[RFC3256]5Link selection Sub-option[RFC3527]6Subscriber-ID Suboption[RFC3993]7RADIUS Attributes Sub-option[RFC4014]8Authentication Suboption[RFC4030]9Vendor-Specific Information Suboption[RFC4243]10Relay Agent Flags[RFC5010]11Server Identifier Override Suboption[RFC5107]12-150Unassigned 151DHCPv4 Virtual Subnet Selection Sub-Option[RFC6607]152DHCPv4 Virtual Subnet Selection Control Sub-Option[RFC6607]Authentication Suboption (value 8) - Algorithm identifier values
- Registration Procedures
IETF Consensus
- Reference
- [
- RFC4030]
Value | Algorithm | Reference | 0Reserved[RFC4030]1HMAC-SHA1 keyed hash[RFC4030]Authentication Suboption (value 8) - Replay Detection Method (RDM) identifier values
- Registration Procedures
IETF Consensus
- Reference
- [
- RFC4030]
Value | Description | Reference | 0Reserved[RFC4030]1use of a monotonically increasing counter value[RFC4030]IEEE 802.21 Service Type (MoS DHCPv4 Address and FQDN Sub-Options)
- Registration Procedures
Standards Action
- Reference
- [
- RFC5678]
Value | Name | Reference | 0Reserved[RFC5678]1IS[RFC5678]2CS[RFC5678]3ES[RFC5678]4-254Unassigned 255Reserved[RFC5678]NTP Time Source Suboptions
- Registration Procedures
IETF Review
- Reference
- [
- RFC5908]
Value | Name | Reference | 1NTP_SUBOPTION_SRV_ADDR[RFC5908]2NTP_SUBOPTION_MC_ADDR[RFC5908]3NTP_SUBOPTION_SRV_FQDN[RFC5908]VSS Type Options
- Registration Procedures
IETF Review
- Reference
- [
- RFC6607]
Type | Name | Reference | 0Network Virtual Terminal (NVT) ASCII VPN identifier[RFC6607]1RFC2685 VPN-ID[RFC2685][RFC6607]2-254Unassigned 255Global, default VPN[RFC6607]People
ID | Name | Contact URI | Last Updated | [Ralph_Droms]Ralph Dromsmailto:rdroms&cisco.com2001-01
