Pad

0

1 octet

Causes the subsequent fields to align on word boundaries.

End

255

1 octet

End of valid information in the vendor field. Subsequent octets should be filled with the Pad options.

Subnet Mask

1

4 octets

Client subnet mask, as per RFC 950. If both the Subnet Mask and the Router option are specified in a DHCP reply, the Subnet Mask option must be first.

Time Offset

2

4 octets

Offset of the client subnet, in seconds, from Universal Time (UT). The offset is expressed as a twos-complement 32-bit integer. A positive offset indicates a location east of the zero meridian and a negative offset indicates a location west of the zero meridian.

Router

3

4 octets minimum; multiples of 4

List of IP addresses for routers on the client subnet. Routers should be in order of preference.

Time Server

4

4 octets minimum; multiples of 4

List of RFC 868 compliant time servers available to the client. Servers should be in order of preference.

Name Server Option

5

4 octets minimum; multiples of 4

List of IEN 116 name servers available to the client. Servers should be in order of preference.

Domain Name Server

6

4 octets minimum; multiples of 4

List of Domain Name System (STD 13, RFC 1035) name servers available to the client. Servers should be in order of preference.

Log Server

7

4 octets minimum; multiples of 4

List of MIT-LCS UDP log servers available to the client. Servers should be in order of preference.

Cookie Server

8

4 octets minimum; multiples of 4

List of RFC 865-compliant cookie servers available to the client. Servers should be in order of preference.

LPR Server

9

4 octets minimum; multiples of 4

List of RFC 1179-compliant line printer servers available to the client. Servers should be in order of preference.

Impress Server

10

4 octets minimum; multiples of 4

List of Imagen Impress servers available to the client. Servers should be in order of preference.

Resource Location Server

11

4 octets minimum; multiples of 4

List of RFC 887-compliant resource location servers available to the client. Servers should be in order of preference.

Host Name

12

1 octet minimum

Name of the client. The name may or may not be qualified with the local domain name. See RFC 1035 for the character set restrictions.

Boot File Size

13

2 octets

Number of 512-octet blocks in the default boot file.

Merit Dump File

14

1 octet minimum

Path name of a file to which the client core image should be placed in the event the client crashes. The path is formatted as a character string consisting of characters from the NVT ASCII character set.

Domain Name

15

1 octet minimum

Domain name that the client should use when resolving hostnames through the Domain Name System.

Swap Server

16

4 octets

IP address of the client swap server.

Root Path

17

1 octet minimum

Path name that contains the client root disk. The path is formatted as a character string consisting of characters from the NVT ASCII character set.

Extensions Path

18

1 octet minimum

Uses a string to specify a file, retrievable through TFTP. The file contains information that can be interpreted in the same way as the 64-octet vendor-extension field within the BOOTP response, with these exceptions: the length of the file is unconstrained, and all references to instances of this option in the file are ignored.

IP Forwarding Enable/Disable

19

1 octet

Specifies whether the client should configure its IP layer for packet forwarding. Values: 0=disable; 1=enable

Non-Local Source Routing Enable/Disable

20

1 octet

Specifies whether the client should configure its IP layer to allow forwarding of datagrams with non-local source routes. Values: 0=disable; 1=enable

Policy Filter

21

8 octets minimum; multiples of 8

Policy filters for non-local source routing. The filters consist of a list of IP addresses and masks that specify destination/mask pairs with which to filter incoming source routes. Any source-routed datagram whose next-hop address does not match one of the filters should be discarded by the client.

Maximum Datagram Reassembly Size

22

2 octets

Maximum size datagram that the client should be prepared to reassemble. Value: 576 minimum

Default IP Time-to-live

23

1 octet

Default TTL that the client should use on outgoing datagrams. Values: 1 to 255

Path MTU Aging Timeout

24

4 octets

Timeout (in seconds) to use when aging Path MTU values (defined in RFC 1191).

Path MTU Plateau Table

25

2 octets minimum; multiples of 2

Table of MTU sizes to use when performing Path MTU Discovery as defined in RFC 1191. The table is formatted as a list of 16-bit unsigned integers, ordered from smallest to largest. Value: 68 minimum

Interface MTU

26

2 octets

MTU to use on this interface.The minimum legal value for the MTU is 68.

All Subnets are Local

27

1 octet

Specifies whether or not the client can assume that all subnets of the IP network to which the client is connected use the same MTU as the subnet of that network to which the client is directly connected. Values: 1=all subnets share same MTU; 0=some directly-connected subnets can have smaller MTUs

Broadcast Address

28

4 octets

Broadcast address in use on the client subnet.

Perform Mask Discovery

29

1 octet

Specifies whether or not the client should perform subnet mask discovery using ICMP. Values: 0=disable; 1=enable

Mask Supplier

30

1 octet

Specifies whether or not the client should respond to subnet mask requests using ICMP. Values: 0=do not respond; 1=respond

Perform Router Discovery

31

1 octet

Specifies whether or not the client should solicit routers using the Router Discovery mechanism defined in RFC 1256. Values: 0=disable; 1=enable

Router Solicitation Address

32

4 octets

Address to which the client should transmit router solicitation requests.

Static Route

33

8 octets minimum; multiples of 8

List of static routes that the client should install in its routing cache. If multiple routes to the same destination are specified, they are in descending order of priority. The routes consist of a list of IP address pairs. The first address is the destination address, and the second address is the router for the destination. The default route (0.0.0.0) is an illegal destination for a static route.

Trailer Encapsulation

34

1 octet

Specifies whether or not the client should negotiate the use of trailers (RFC 893) when using the ARP protocol. Values: 0=do not use; 1=use

ARP Cache Timeout

35

4 octets

Timeout in seconds for ARP cache entries.

Ethernet Encapsulation

36

1 octet

Specifies whether or not the client should use Ethernet Version 2 (RFC 894) or IEEE 802.3 (RFC 1042) encapsulation if the interface is an Ethernet. Value: 0=use RFC 894 encapsulation; 1=use RFC 1042 encapsulation

TCP Default TTL

37

1 octet

Default TTL that the client should use when sending TCP segments. Value: minimum 1

TCP Keepalive Interval

38

4 octets

Interval (in seconds) that the client TCP should wait before sending a keepalive message on a TCP connection. The time is specified as a 32-bit unsigned integer. A value of zero indicates that the client should not generate keepalive messages on connections unless specifically requested by an application. Value: 32-bit unsigned; 0=do not generate keepalive messages unless specifically requested.

TCP Keepalive Garbage

39

1 octet

Specifies the whether or not the client should send TCP keep-alive messages with an octet of garbage for compatibility with older implementations. Values: 0=do not send; 1=send

Network Information Service (NIS) Domain

40

1 octet minimum

Name of the client NIS domain. The domain is formatted as a character string consisting of characters from the NVT ASCII character set.

Network Information Service (NIS) Servers

41

4 octets minimum; multiples of 4

List of IP addresses indicating NIS servers available to the client. Servers should be in order of preference.

Network Time Protocol Servers

42

4 octets minimum; multiples of 4

List of IP addresses indicating NTP servers that are available to the client. Servers should be in order of preference.

Vendor-Specific Information

43

1 octet minimum

This option is used by clients and servers to exchange vendor-specific information. The information is an opaque object of n octets, presumably interpreted by vendor-specific code on the clients and servers. The definition of this information is vendor specific. The vendor is indicated in the dhcp-class-identifier option. Servers not equipped to interpret the vendor-specific information sent by a client must ignore it (although it can be reported). Clients that do not receive desired vendor-specific information should make an attempt to operate without it, although they can do so (and announce they are doing so) in a degraded mode.

If a vendor potentially encodes more than one item of information in this option, then the vendor should encode the option using encapsulated vendor-specific options as described here.

The encapsulated vendor-specific options field should be encoded as a sequence of code, length, and value fields of identical syntax to the DHCP options field with these exceptions:

• There should not be a magic cookie field in the encapsulated vendor-specific extensions field.

• Codes other than 0 or 255 can be redefined by the vendor within the encapsulated vendor-specific extensions field, but should conform to the tag-length-value syntax defined in section 2.

Code 255 (END), if present, signifies the end of the encapsulated vendor extensions, not the end of the vendor extensions field.

If the code 255 is not present, then the end of the enclosing vendor-specific information field is taken as the end of the encapsulated vendor-specific extensions field.

NetBIOS over TCP/IP Name Server

44

4 octets minimum; multiples of 4

List of RFC 1001/1002 NBNS name servers in order of preference.

NetBIOS over TCP/IP Datagram Distribution Server

45

4 octets minimum; multiples of 4

List of RFC 1001/1002 NBDD servers in order of preference.

NetBIOS over TCP/IP Node Type

46

1 octet

Allows NetBIOS over TCP/IP client, which are configured as described in RFC 1001/1002. Values: Single hexadecimal octet that identifies the client type:

• 0x1=B-node (broadcast node)

• 0x2=P-node (point-to-point node)

• 0x4=M-node (mixed node)

• 0x8=H-node

NetBIOS over TCP/IP Scope

47

1 octet minimum

NetBIOS over TCP/IP scope parameter for the client as specified in RFC 1001/1002.

X Window System Font Server

48

4 octets minimum; multiples of 4

List of X Window System Font servers available to the client. Servers should be in order of preference.

X Window System Display Manager

49

4 octets minimum; multiples of 4

List of IP addresses of systems that are running the X Window System Display Manager and are available to the client. Addresses should be in order of preference.

Network Information Service (NIS+) Domain

64

1 octet minimum

Name of the client NIS+ domain. The domain is formatted as a character string consisting of characters from the NVT ASCII character set.

Network Information Service (NIS+) Servers

65

4 octets minimum; multiples of 4

List of IP addresses indicating NIS+ servers available to the client. Servers should be in order of preference.

Mobile IP Home Agent

68

0 octet minimum; multiples of 4; expected, 4 octets containing a single home agent address

List of IP addresses indicating mobile IP home agents available to the client. Agents should be in order of preference. Value: 32-bit address; 0=no home agents available

Simple Mail Transport Protocol (SMTP) Server

69

4 octets minimum; multiples of 4

List of SMTP servers available to the client. Servers should be in order of preference.

Post Office Protocol (POP3) Server

70

4 octets minimum; multiples of 4

List of POP3 servers available to the client. Servers should be in order of preference.

Network News Transport Protocol (NNTP) Server

71

4 octets minimum; multiples of 4

List of NNTP servers available to the client. Servers should be in order of preference.

Default World Wide Web (WWW) Server

72

4 octets minimum; multiples of 4

List of World Wide Web (WWW) servers available to the client. Servers should be in order of preference.

Default Finger Server

73

4 octets minimum; multiples of 4

List of Finger servers available to the client. Servers should be in order of preference.

Default Internet Relay Chat (IRC) Server

74

4 octets minimum; multiples of 4

List of IRC servers available to the client. Servers should be in order of preference.

StreetTalk Server

75

4 octets minimum; multiples of 4

List of StreetTalk servers available to the client. Servers should be in order of preference.

StreetTalk Directory Assistance (STDA) Server

76

4 octets minimum; multiples of 4

List of STDA servers available to the client. Servers should be in order of preference.

Requested IP Address

50

4 octets

Used in a client request (DHCPDISCOVER) to allow the client to request that a particular IP address be assigned.

IP Address Lease Time

51

4 octets

Used in a client request (DHCPDISCOVER or DHCPREQUEST) to allow the client to request a lease time for the IP address. In a server reply (DHCPOFFER), a DHCP server uses this option to specify the lease time it is willing to offer. Value: seconds, as 32-bit unsigned integer

Option Overload

52

1 octet

Indicates that the DHCP sname or file fields are being overloaded by using them to carry DHCP options. A DHCP server inserts this option if the returned parameters will exceed the usual space allotted for options. If this option is present, the client interprets the specified additional fields after it concludes interpretation of the standard option fields. Values: 1=file field is used to hold options; 2=sname field is used to hold options; 3=both fields are used to hold options

DHCP Message Type

53

1 octet

Used to convey the type of DHCP message. The preset value is 1 (DHCPDISCOVER). Values: 1=DHCPDISCOVER; 2=DHCPOFFER; 3=DHCPREQUEST; 4=DHCPDECLINE; 5=DHCPACK; 6=DHCPNAK; 7=DHCPRELEASE; 8=DHCPINFORM; 13=LEASEQUERY

Server Identifier

54

4 octets

Used in DHCPOFFER and DHCPREQUEST messages, and can optionally be included in the DHCPACK and DHCPNAK messages. DHCP servers include this option in the DHCPOFFER in order to allow the client to distinguish between lease offers. DHCP clients use the contents of the server identifier field as the destination address for any DHCP messages unicast to the DHCP server. DHCP clients also indicate which of several lease offers is being accepted by including this option in a DHCPREQUEST message. The identifier is the IP address of the selected server.

Parameter Request List

55

1 octet minimum

Used by a DHCP client to request values for specified configuration parameters. The list of requested parameters is specified as n octets, where each octet is a valid DHCP option code as defined in this document. The client can list the options in order of preference. The DHCP server does not have to return the options in the requested order, but must try to insert the options in the order that the client requested.

Message

56

1 octet minimum

Used by a DHCP server to provide an error message to a DHCP client in a DHCPNAK message in the event of a failure. A client can use this option in a DHCPDECLINE message to indicate why the client declined the offered parameters. The message consists of n octets of NVT ASCII text, which the client can display on an available output device.

Maximum DHCP Message Size

57

2 octets

Maximum-length DHCP message that a server is willing to accept. The length is specified as an unsigned 16-bit integer. A client can use the maximum DHCP message size option in DHCPDISCOVER or DHCPREQUEST messages, but should not use the option in DHCPDECLINE messages. Value: 576 minimum

Renewal (T1) Time Value

58

4 octets

Time interval from address assignment until the client transitions to RENEWING state. Value: seconds, as 32-bit unsigned integer

Rebinding (T2) Time Value

59

4 octets

Time interval from address assignment until the client transitions to REBINDING state. Value: seconds, as 32-bit unsigned integer

Vendor Class Identifier

60

1 octet minimum

Used by DHCP clients to optionally identify the vendor type and configuration of a DHCP client. The information is a string of n octets, interpreted by servers. Vendors can choose to define specific vendor class identifiers to convey particular configuration or other identification information about a client. For example, the identifier can encode the client hardware configuration. Servers not equipped to interpret the class-specific information sent by a client must ignore it (although it can be reported). Servers that respond should only use option 43 to return the vendor-specific information to the client.

Client-Identifier

61

2 octets minimum

Used by DHCP clients to specify their unique identifier. DHCP servers use this value to index their database of address bindings. This value is expected to be unique for all clients in an administrative domain.

DHCP servers should treat identifiers as opaque objects. The client identifier can consist of type-value pairs similar to the htype /chaddr fields. For instance, it can consist of a hardware type and hardware address. In this case, the type field should be one of the ARP hardware types defined in STD2. A hardware type of 0 (zero) should be used when the value field contains an identifier other than a hardware address (for example, a fully qualified domain name).

For correct identification of clients, each client-identifier must be unique among the client-identifiers used on the subnet to which the client is attached. Vendors and system administrators are responsible for choosing client-identifiers that meet this requirement for uniqueness.

TFTP Server name

66

1 octet minimum

Identifies a TFTP server when the sname field in the DHCP header has been used for DHCP options.

Bootfile name

67

1 octet minimum

Identifies a bootfile when the file field is the DHCP header that has been used for DHCP options.

Relay Agent Information

82

Identifies the DHCP relay agent information (see RFC 3046)

iSNS

83

14 bytes minimum

Identifies the Internet Storage Name Service (see RFC 4174)

BCMCS Controller Domain

88

Variable

List of Broadcast and Multicast Service (BCMCS) controller domains (see RFC 4280)

BCMCS Address

89

4 octets minimum

List of IP addresses for the BCMCS controller (see RFC 4280)

Lease Query Client Last Transaction Time

91

4 octets

Time of the most recent access of the client sending a DHCPLEASEQUERY (see RFC 4388).

Lease Query Associated IP Addresses

92

4 octets minimum

All IP addresses associated with the client specified in a particular DHCPLEASEQUERY message (see RFC 4388).

dhcp-lease-time

51

14 days

domain-name

15

A domain name such as cisco.com

domain-name-servers

6

IP address of the name servers

netbios-name-servers

44

WINS server address

netbios-node-type

46

Identifies the NetBIOS client type; note that Cisco Prime Network Registrar displays a warning if it is not present

routers

3

IP address of the router for this subnet

client-identifier

AT_BLOB

1

DUID identifying a client between a client and a server. See RFC 3315.

server-identifier

AT_BLOB

2

DUID identifying a server between a client and a server. See RFC 3315.

ia-na

AT_BLOB

3

Nontemporary Addresses option with the associated parameters and addresses. Parameters are the unique ID, time the client contacts the addresses in the IA to extend the lifetime, and time the client contacts any available server to extend the lifetime of the addresses. See RFC 3315.

ia-ta

AT_BLOB

4

Temporary Addresses option with the associated parameters and addresses. See RFC 3315.

iaaddr

AT_BLOB

5

IPv6 addresses associated with an IA_NA or IA_TA. (The IAADRR must be encapsulated in the options field of an IA_NA or IA_TA option.) The IAADDR option includes preferred and valid lifetime fields, and the options field that encapsulates the options specific to this address. See RFC 3315.

oro

AT_SHORT

6

Option Request option (ORO) that identifies a list of options in a message between a client and a server. A client can include this option in a Solicit, Request, Renew, Rebind, Confirm, or Information-request message to inform the server about options the client wants from the server. A server can include this option in a Reconfigure message to indicate which option updates the client should request. See RFC 3315.

preference

AT_INT8

7

A server sends this option to a client to affect what server the client selects. See RFC 3315.

elapsed-time

AT_SHORT

8

A client sends this option to a server to indicate how long the client has been trying to complete a message exchange. See RFC 3315.

relay-message

AT_BLOB

9

DHCP message in a Relay-forward or Relay-reply message. See RFC 3315.

auth

AT_BLOB

11

Authenticates the identity and contents of a DHCP message. The parameters are the authentication protocol, the authentication algorithm, the replay detection method (RDM), and the authentication information. See RFC 3315.

server-unicast

AT_IP6ADDR

12

The server sends this option to a client to indicate that the client can unicast messages to the server. See RFC 3315.

status-code

AT_BLOB

13

Returns a status indication related to the DHCP message or option in which it appears. The parameters are the status code and status message. See RFC 3315.

rapid-commit

AT_ZEROSIZE

14

Signals use of the two-message exchange for address assignment. See RFC 3315.

user-class

AT_TYPECNT

15

Clients use this option to identify the type or category of user or applications it represents. A zero type count value field followed by user data (as a blob). See RFC 3315.

vendor-class

AT_VENDOR_CLASS

16

Clients use this option to identify the vendor that manufactured the hardware on which they are running. See RFC 3315.

vendor-opts

AT_VENDOR_OPTS

17

Clients and servers use this option to exchange vendor-specific information. The enterprise ID for the CableLabs vendor is 4491; the suboptions for CableLabs are listed in Table 4. See RFC 3315.

interface-id

AT_BLOB

18

Relay agents use this option to identify the interface on which the client message is received. See RFC 3315.

reconfigure-message

AT_INT8

19

The server includes this in a Reconfigure message to indicate whether the client should respond with a Renew or Information-request message. See RFC 3315.

reconfigure-accept

AT_ZEROSIZE

20

Clients use this option to announce to the server whether the client is willing to accept Reconfigure messages. See RFC 3315.

sip-servers-name

AT_DNSNAME

21

Domain names of the SIP outbound proxy servers for the client. See RFC 3319.

sip-servers-address

AT_IP6ADDR

22

IPv6 addresses of the SIP outbound proxy servers for the client. See RFC 3319.

dns-servers

AT_IP6ADDR

23

IPv6 addresses of DNS recursive name servers. See RFC 3646.

domain-list

AT_DNSNAME

24

Domain names in the domain search list. See RFC 3646.

ia-pd

AT_BLOB

25

IPv6 prefix delegation identity association and its associated parameters and prefixes. Parameters are the unique ID, time the client contacts the addresses in the IA to extend the lifetime, and time the client contacts any available server to extend the lifetime of the addresses. See RFC 3633.

iaprefix

AT_BLOB

26

IPv6 prefixes associated with an IA_PD. The prefix must be encapsulated in the options field of an IA_PD option. Parameters are the valid and preferred lifetimes, prefix length, and the prefix. See RFC 3633.

nis-servers

AT_IP6ADDR

27

List of IPv6 addresses of Network Information Service (NIS) servers available to the client. See RFC 3898.

nisp-servers

AT_IP6ADDR

28

List of IPv6 addresses of NIS+ servers available to the client. See RFC 3898.

nis-domain-name

AT_DNSNAME

29

Conveys the NIS domain name to the client. See RFC 3898.

nisp-domain-name

AT_DNSNAME

30

Conveys the NIS+ domain name to the client. See RFC 3898.

sntp-servers

AT_IP6ADDR

31

List of Simple Network Time Protocol (SNTP) servers available to the client. See RFC 4075.

info-refresh-time

AT_TIME

32

Sets an upper bound for how long a client should wait before refreshing DHCPv6 information. See RFC 4242.

bcmcs-server-d

AT_DNSNAME

33

List of BCMCS controller domains. See RFC 4280.

bcmcs-server-a

AT_IP6ADDR

34

List of IPv6 addresses for the Broadcast and Multicast Service (BCMCS) controller. See RFC 4280.

geoconf-civic

AT_BLOB

36

DHCP civic addresses configuration. See RFC 4776.

remote-id

AT_BLOB

37

Relay agents that terminate switched or permanent circuits can add this option to identify remote hosts. See RFC 4649.

relay-agent-subscriber-id

AT_BLOB

38

Allows assignment and activation of subscriber-specific actions. See RFC 4580.

client-fqdn

AT_BLOB

39

DHCP client FQDN. See RFC 4704.

pana-agent

AT_IP6ADDR

40

Carries a list of 32-bit (binary) IPv4 addresses indicating PANA Authentication Agents (PAAs) available to the PANA client (PaC). See RFC 5192.

new-posix-timezone

AT_NSTRING

41

POSIX time zone, for example, EST5EDT4, M3.2.0/02:00,M11.1.0/02:00. See RFC 4833.

new-tzdb-timezone

AT_NSTRING

42

POSIX time zone database name, for example, Europe/Zurich. See RFC 4833.

ero

AT_SHORT

43

Relay agent Echo Request option to inform the server of the list of relay agent options to echo back. See RFC 4994.

lq-query

AT_BLOB

44

Used only in a LEASEQUERY message; identifies the query being performed. The option includes the query type, link-address (or 0::0), and options to provide data needed for the query. See RFC 5007.

client-data

AT_CONTAINER6

45

Encapsulates the data for a single client on a single link in a LEASEQUERY-REPLY message. See RFC 5007.

clt-time

AT_TIME

46

Client last transaction time encapsulated in the client-data option; identifies how long ago the server last communicated with the client (in seconds). See RFC 5007.

lq-relay-data

AT_BLOB

47

Used only in a LEASEQUERY-REPLY message; provides the relay agent data used when the client last communicated with the server. See RFC 5007.

lq-client-links

AT_IP6ADDR

48

Used only in a LEASEQUERY-REPLY message; identifies the links on which the client has one or more bindings. It is used in reply to a query when no link-address was specified and the client is found to be on more than one link. See RFC 5007.

mip6-hnidf

AT_DNSNAME

49

Defines the Home Network ID FQDN option. See RFC 6610.

mip6-vdinf

AT_CONTAINER6

50

Defines the Visited Home Network Information option. See RFC 6610.

lost-server

AT_DNSNAME

51

A DHCPv6 client will request a LoST server domain name in an Options Request Option (ORO) (see RFC 3315).

This option contains a single domain name and must contain precisely one root label. See RFC 5223.

capwap-ac-v6

AT_IP6ADDR

52

Carries a list of 128-bit (binary) IPv6 addresses indicating one or more Control and Provisioning of Wireless Access Point (CAPWAP) Access Controllers (ACs) available to the Wireless Termination Point (WTP). Ssee RFC 5417.

relay-id

AT_BLOB

53

A DHCPv6 server MAY associate Relay-ID options from Relay-Forward messages it processes with prefix delegations and/or lease bindings that result. See RFC 5460.

mos-address

AT_IP6ADDR

54

Mobility Sever (MoS) IPv6 Address for DHCP v4. See RFC 5678.

mos-fqdn

AT_BLOB

55

Mobility Sever (MoS) Domain Name List for DHCPv6. See RFC 5678.

ntp-server

AT_BLOB

56

Serves as a container for server location information related to one Network Time Protocol (NTP) server or Simple Network Time Protocol (SNTP) server. This option can appear multiple times in a DHCPv6 message. Each instance of this option is to be considered by the NTP client or SNTP client as a server to include in its configuration.

The option itself does not contain any value. Instead, it contains one or several suboptions that carry NTP server or SNTP server location. See RFC 5908.

access-domain

AT_DNSNAME

57

Defines the domain name associated with the access network. This option contains a single domain name and, as such, must contain precisely one root label. See RFC 5986.

sip-ua-cs-domains

AT_DNSNAME

58

Defines the list of domain names in the Session Initiation Protocol (SIP) User Agent Configuration Service Domains. See RFC 6011.

bootfile-url

AT_NSTRING

59

Informs the client about a URL to a boot file. See RFC 5970.

bootfile-param

AT_TYPECNT

60

Sent by the server to the client. It consists of multiple UTF-8 (see RFC 3629) strings for specifying parameters for the boot file. See RFC 5970.

client-arch-type

AT_SHORT

61

Provides parity with the Client System Architecture Type option (option 93) defined for DHCPv4. See RFC 5970.

nii

AT_BLOB

62

Provides parity with the Client Network Interface Identifier option (option 94) defined for DHCPv4. See RFC 5970.

geoloc

AT_BLOB

63

Specifies the coordinate-based geographic location of the client, to be provided by the server. See RFC 6225.

aftr-name

AT_DNSNAME

64

Defines a fully qualified domain name of the AFTR tunnel endpoint. See RFC 6334.

erp-local-domain-name

AT_DNSNAME

65

Contains the name of the local ERP domain. See RFC 6440.

rsoo

AT_CONTAINER6

66

Encapsulates whatever options the relay agent wishes to provide to the DHCPv6 server. See RFC 6422.

pd-exclude

AT_BLOB

67

Used to exclude exactly one prefix from a delegated prefix. See RFC 6603.

vpn-id

AT_BLOB

68

Used to identify a VPN. See RFC 6607.

mip6-idinf

AT_CONTAINER6

69

Used by relay agents and DHCP servers to provide information about the home network identified. See RFC 6610.

mip6-udinf

AT_CONTAINER6

70

Provides information about a home network specified by the DHCP server administrator. See RFC 6610.

mip6-hnp

AT_BLOB

71

Defines the prefix for a home network. See RFC 6610.

mip6-haa

AT_IP6ADDR

72

Used by DHCP servers and relay agents to specify the home agent IP address. See RFC 6610.

mip6-haf

AT_DNSNAME

73

Specifies the Home Agent FQDN to look up one or more A or AAAA records containing IPv4 or IPv6 addresses for the home agent, as needed. See RFC 6610.

rdnss-selection

AT_BLOB

74

Informs resolvers which RDNSS can be contacted when initiating forward or reverse DNS lookup procedures. See RFC 6731.

krb-principal-name

AT_BLOB

75

Sent by the client to the DHCPv6 server, which uses it to select a specific set of configuration parameters, either for a client or for a Kerberos application server. See RFC 6784.

krb-realm-name

AT_NSTRING

76

Specifies to a DHCPv6 server which realm the client wants to access. See RFC 6784.

krb-default-realm-name

AT_NSTRING

77

Specifies a default realm name for the Kerberos system (clients and Kerberos application servers). See RFC 6784.

krb-kdc

AT_BLOB

78

Provides configuration information about a KDC. See RFC 6784.

client-linklayer-address

AT_BLOB

79

Indicates the client link layer address. See RFC 6939.

link-address

AT_IP6ADDR

80

Indicates to the server the link on which the client is located. See RFC 6977.

radius

AT_BLOB

81

Provides a mechanism to exchange authorization and identification information between the DHCPv6 relay agent and DHCPv6 server. See RFC 7037.

sol-max-rt

AT_TIME

82

Overrides the default value of sol-max-rt. See RFC 7083.

inf-max-rt

AT_TIME

83

Overrides the default value of inf-max-rt. See RFC 7083.

addrsel

AT_BLOB

84

Provides the policy table and some other configuration parameters. See RFC 7078.

addrsel-table

AT_BLOB

85

Provides the Address Selection Policy Table options. See RFC 7078.

v6-pcp-server

AT_IP6ADDR

86

Configures a list of IPv6 addresses of a PCP server. This option supports only single instance. See RFC 7291.

dhcpv4-msg

AT_BLOB

87

Carries a DHCPv4 message that is sent by the client or the server. Such messages exclude any IP or UDP headers. See RFC 7341.

dhcp4-o-dhcp6-server

AT_IP6ADDR

88

Carries a list of DHCP 4o6 servers' IPv6 addresses that the client should contact to obtain IPv4 configuration. See RFC 7341.

s46-rule

AT_BLOB

89

Conveys the Basic Mapping Rule (BMR) and Forwarding Mapping Rule (FMR). See RFC 7598.

s46-br

AT_IP6ADDR

90

Conveys the the IPv6 address of the Border Relay. See RFC 7598.

s46-dmr

91

Conveys values for the Default Mapping Rule (DMR). See RFC 7598.

s46-v4v6bind

AT_BLOB

92

Specifies the full or shared IPv4 address of the CE. The IPv6 prefix field is used by the CE to identify the correct prefix to use for the tunnel source. See RFC 7598.

s46-portparams

AT_BLOB

93

Specifies optional port set information that MAY be provided to CEs. See RFC 7598.

s46-cont-mape

AT_CONTAINER6

94

Specifies the container used to group all rules and optional port parameters for a specified domain (Softwire46 MAP-E domain). See RFC 7598.

s46-cont-mapt

AT_CONTAINER6

95

Specifies the container used to group all rules and optional port parameters for a specified domain (Softwire46 MAP-T domain). See RFC 7598.

s46-cont-lw

AT_CONTAINER6

96

Specifies the container used to group all rules and optional port parameters for a specified domain (Softwire46 Lightweight 4over6 domain). See RFC 7598.

4rd

AT_CONTAINER6

97

Indicates the DHCPv6 option for 4rd (IPv4 Residual Deployment). See RFC 7600.

4rd-map-rule

AT_BLOB

98

Indicates the Mapping-Rule Parameters of 4rd domains. See RFC 7600.

4rd-non-map-rule

AT_BLOB

99

Indicates the Non-Mapping-Rule Parameters of 4rd domains. See RFC 7600.

lq-base-time

AT_INT

100

Current time the message was created to be sent by the DHCPv6 server to the requestor of the Active or Bulk Leasequery if the requestor asked for the same in an Active or Bulk Leasequery request. See RFC 7653.

lq-start-time

AT_INT

101

Specifies a query start time to the DHCPv6 server. See RFC 7653.

lq-end-time

AT_INT

102

Specifies a query end time to the DHCPv6 server. See RFC 7653.

captive-portal

AT_NSTRING

103

Informs the client that it is behind a captive portal and provides the URI to access an authentication page. See RFC 7710.

mpl-parameters

AT_BLOB

104

Provides a means to distribute a configuration of an MPL Domain or a default value for all MPL Domains (a wildcard) within the network managed by the DHCP server. See RFC 7774.

ani-att

AT_BLOB

105

Used for exchanging the type of access technology the client uses to attach to the network. See RFC 7839.

ani-network-name

AT_NSTRING

106

Name of the access network to which the mobile node is attached. See RFC 7839.

ani-ap-name

AT_NSTRING

107

Name of the access point (physical device name) to which the mobile node is attached. See RFC 7839.

ani-ap-bssid

AT_BLOB

108

48-bit Basic SSSID (BSSID) of the access point to which the mobile node is attached. See RFC 7839.

ani-operator-id

AT_BLOB

109

Variable-length Private Enterprise Number (PEN) encoded in a network byte order. See RFC 7839.

ani-operator-realm

AT_NSTRING

110

Realm of the operator. See RFC 7839.

s46-priority

AT_SHORT

111

Conveys a priority order of IPv4 service continuity mechanisms. See RFC 8026.

mud-url

AT_NSTRING

112

Identifies the type of Thing to the network in a structured way such that the policy can be easily found with existing toolsets. See RFC 8520.

prefix64

AT_BLOB

113

Conveys the IPv6 prefix(es) to be used (for example, by an mB4) to synthesize IPv4-embedded IPv6 addresses. See RFC 8115.

relay-port

AT_SHORT

135

Relay Source Port Option for DHCPv6. This requires specialized server processing and is not a "configurable" option - the option is added by a relay agent and must be echoed by the server in the Relay-Reply, and requires specialized processing in the server to return the response to the relay via the relayed packet's source port. See RFC 8357.

sztp-redirect

AT_TYPECNT (list of URI strings)

136

Used to provision the client with one or more URIs for bootstrap servers that can be contacted to attempt further configuration. See RFC 8572.

s6-bind-ipv6-prefix

AT_VPREFIX

137

DHCPv6 Softwire Source Binding Prefix Hint option. See RFC 8539.

ipv6-address-andsf

AT_IP6ADDR

143

Allows the mobile node (MN) to locate an ANDSF server. See RFC 6153.

0

pad

Pad

See RFC 2132.

1

subnet-mask

Subnet Mask

See RFC 2132.

2

time-offset

Time Offset

Replaced by tz- options (RFC 4833). See RFC 2132.

3

routers

Router

1+

See RFC 2132.

4

time-servers

Time Server

1+

See RFC 2132.

5

name-servers

Name Server

1+

See RFC 2132.

6

domain-name-servers

Domain Server

1+

See RFC 2132.

7

log-servers

Log Server

1+

See RFC 2132.

8

cookie-servers

Quotes Server

1+

See RFC 2132.

9

lpr-servers

LPR Server

1+

See RFC 2132.

10

impress-servers

Impress Server

1+

See RFC 2132.

11

resource-location-servers

RLP Server

1+

See RFC 2132.

12

host-name

Host Name

See RFC 2132.

13

boot-size

Boot File Size

See RFC 2132.

14

merit-dump

Merit Dump File

See RFC 2132.

15

domain-name

Domain Name

See RFC 2132.

16

swap-server

Swap Server

See RFC 2132.

17

root-path

Root Path

See RFC 2132.

18

extensions-path

Extension File

See RFC 2132.

19

ip-forwarding

Forward On/Off

See RFC 2132.

20

non-local-source-routing

SrcRte On/Off

See RFC 2132.

21

policy-filters

Policy Filter

2n

See RFC 2132.

22

max-dgram-reassembly

Maximum DG Assembly

See RFC 2132.

23

default-ip-ttl

Default IP TTL

See RFC 2132.

24

path-mtu-aging-timeout

MTU Timeout

See RFC 2132.

25

path-mtu-plateau-tables

MTU Plateau

1+

See RFC 2132.

26

interface-mtu

MTU Interface

See RFC 2132.

27

all-subnets-local

MTU Subnet

See RFC 2132.

28

broadcast-address

Broadcast Address

See RFC 2132.

29

perform-mask-discovery

Mask Discovery

See RFC 2132.

30

mask-supplier

Mask Supplier

See RFC 2132.

31

router-discovery

Router Discovery

See RFC 2132.

32

router-solicitation-address

Router Request

See RFC 2132.

33

static-routes

Static Route

2n

See RFC 2132.

34

trailer-encapsulation

Trailers

See RFC 2132.

35

arp-cache-timeout

ARP Timeout

See RFC 2132.

36

ieee802.3-encapsulation

Ethernet

See RFC 2132.

37

default-tcp-ttl

Default TCP TTL

See RFC 2132.

38

tcp-keepalive-interval

Keepalive Time

See RFC 2132.

39

tcp-keepalive-garbage

Keepalive Data

See RFC 2132.

40

nis-domain

NIS Domain

See RFC 2132.

41

nis-servers

NIS Servers

1+

See RFC 2132.

42

ntp-servers

NTP Servers

1+

See RFC 2132.

43

vendor-encapsulated- options

Vendor Specific

NM

See RFC 2132.

44

netbios-name-servers

NetBIOS Name Server

1+

See RFC 2132.

45

netbios-dd-servers

NetBIOS Distribution Server

1+

See RFC 2132.

46

netbios-node-type

NetBIOS Node Type

See RFC 2132.

47

netbios-scope

NetBIOS Scope

See RFC 2132.

48

font-servers

X Window Font

1+

See RFC 2132.

49

x-display-managers

X Window Manager

1+

See RFC 2132.

50

dhcp-requested-address

Address Request

See RFC 2132.

51

dhcp-lease-time

Address Time

NM

See RFC 2132.

52

dhcp-option-overload

Overload

See RFC 2132.

53

dhcp-message-type

DHCP Message Type

NM (See the DHCP Message Type option in Table 1)

See RFC 2132.

54

dhcp-server-identifier

DHCP Server ID

See RFC 2132.

55

dhcp-parameter-request- list

Parameter List

0+

See RFC 2132.

56

dhcp-message

DHCP Message

NM

See RFC 2132.

57

dhcp-max-message-size

DHCP Maximum Message Size

NM

See RFC 2132.

58

dhcp-renewal-time

Renewing Time

NM

See RFC 2132.

59

dhcp-rebinding-time

Rebinding Time

NM

See RFC 2132.

60

dhcp-class-identifier

Class Identifier

See RFC 2132.

61

dhcp-client-identifier

Client Identifier

See RFC 2132.

62

netwareip-domain

NetWare/IP Domain

See RFC 2242.

63

netwareip-information

NetWare/IP Option

See RFC 2242.

64

nis+-domain

NIS Domain Name

See RFC 2132.

65

nis+-servers

NIS Server Address

1+

See RFC 2132.

66

tftp-server

TFTP Server Name

See RFC 2132.

67

boot-file

Bootfile Name

See RFC 2132.

68

mobile-ip-home-agents

Mobile IP Home Agent

0+

See RFC 2132.

69

smtp-servers

SMTP Server

1+

See RFC 2132.

70

pop3-servers

POP3 Server

1+

See RFC 2132.

71

nntp-servers

NNTP Server

1+

See RFC 2132.

72

www-servers

WWW Server

1+

See RFC 2132.

73

finger-servers

Finger Server

1+

See RFC 2132.

74

irc-servers

IRC Server

1+

See RFC 2132.

75

streettalk-servers

StreetTalk Server

1+

See RFC 2132.

76

streettalk-directory- assistance-servers

STDA Server

1+

See RFC 2132.

77

dhcp-user-class-id

User Class ID

Suboptions (2)

See RFC 3004.

78

slp-directory-agent

Service Location Protocol Directory Agent

Suboptions (2)

See RFC 2610.

79

slp-service-scope

SLP Service Scope

Suboptions (2)

See RFC 2610.

80

rapid-commit

Rapid Commit

See RFC 4039

81

client-fqdn

Client FQDN

Suboptions (4)

See RFC 4702

82

relay-agent-info

Relay Agent Information

For suboptions, see Table 3

See RFC 3046

83

iSNS

Internet Storage Name Service (RFC 4174)

Suboptions (7)

See RFC 4174

85

nds-servers

NDS Servers

1+

See RFC 2241

86

nds-tree

NDS Tree Name

See RFC 2241

87

nds-context

NDS Context

See RFC 2241

88

bcmcs-servers-d

BCMCS Controller Domain (RFC 4280)

1+

See RFC 4280

89

bcmcs-servers-a

BCMCS Address

1+

See RFC 4280

90

authentication

Authentication

Suboptions (5)

See RFC 3118

91

lq- client-last-transaction- time

Lease Query Client Last Transaction Time

See RFC 4388

92

lq- associated-ip

Lease Query Associated IP Addresses

1+

See RFC 4388

93

pxe-client-arch

See RFC 4578

94

pxe-client-network-id

Suboptions (2)

See RFC 4578

95

ldap-url

See RFC 3679

97

pxe-client-machine-id

Suboptions (2)

See RFC 4578

98

user-auth

See RFC 2485

99

geoconf-civic

Civic Addresses Configuration

See RFC 4776

100

posix-timezone

IEEE 1003.1 String

See RFC 4833

101

tzdb-timezone

Time Zone Database

See RFC 4833

109

dhcp4o6-s46-saddr

DHCP 4o6 Softwire Source Address

AT_IP6ADDR

See RFC 8539

112

netinfo-parent-server-addr

See RFC 3679

113

netinfo-parent-server-tag

See RFC 3679

114

initial-url

See RFC 3679

116

auto-configure

Autoconfiguration

See RFC 2563

117

name-service-search

Name Service Search

1+

See RFC 2937

118

subnet-selection

Subnet Selection

See RFC 3011

119

domain-search

Domain Search

1+

See RFC 3397

120

sip-servers

SIP Servers

Suboptions (2)

See RFC 3361

121

classless-static-route

Classless Static Route

See RFC 3442

122

cablelabs-client- configuration

CableLabs Client Configuration

Suboptions (10) (see the Table 3)

See RFC 3495

123

geo-conf

GeoConf Option

See RFC 6225

124

v-i-vendor-class

Vendor-Identifying Vendor Class

NM

See RFC 3925

125

v-i-vendor-opts

Vendor-Identifying Vendor-Specific Info

See also the cablelabs-125 suboptions in Table 3

See RFC 3925

128

mcns-security-server

--

See RFC 4578

136

pana-agent

1+

See RFC 5192

137

lost-server

See RFC 5223

138

capwap-ac-v4

1+

See RFC 5417

139

mos-address

Suboptions (3)

0+

See RFC 5678

140

mos-fqdn

Suboptions (3)

0+

See RFC 5678

141

sip-ua-cs-domains

0+

See RFC 6011

142

andsf-v4

Access Network Discovery and Selection Function

See RFC 6153

143

sztp-redirect

DHCPv4 SZTP Redirect

AT_TYPECNT

0+

See RFC 8572

144

geoloc

Geospatial Location with Uncertainty

See RFC 6225

145

forcerenew-nonce-capable

Forcerenew Nonce Authentication

1+

See RFC 6704

146

rdnss-selection

RDNSS Selection

Suboptions (4)

See RFC 6731

150

tftp-server-address

TFTP

1+

See RFC 5859

151

status-code

Suboptions (2)

See RFC 6926

152

base-time

See RFC 6926

153

start-time-of-state

See RFC 6926

154

query-start-time

See RFC 6926

155

query-end-time

See RFC 6926

156

dhcp-state

See RFC 6926

157

data-source

See RFC 6926

158

v4-pcp-server

Port Control

Suboptions (2)

See RFC 7291

159

v4-portparams

Suboptions (3)

See RFC 7618

160

captive-portal

DHCP Captive-Portal

See RFC 7710

161

mud-url

IPv4 MUD URL

See RFC 8520

162

cisco-client-requested- host-name

Cisco

See RFC 3942

163

cisco-client-last- transaction-time

Cisco

See RFC 3942

185

vpn-id

VPN Identifier

NM: Suboptions (2)

See RFC 3942

209

pxelinux-config-file

See RFC 5071

210

pxelinux-path-prefix

See RFC 5071

211

pxelinux-reboot-time

See RFC 5071

212

6rd

Suboptions (4)

See RFC 5969

213

access-domain

See RFC 5986

220

subnet-alloc

Subnet Allocation

Suboptions (5)

See RFC 6656

221

cisco-vpn-id

Cisco VPN Identifier

Suboptions (2)

See RFC 6607

251

cisco-auto-configure

Cisco Autoconfiguration

255

end

End

NM

See RFC 2132

4rd

97

IPv4 Residual Deployment via IPv6 (4rd)

DHCPv6

4rd-map-rule

98

4rd Map Rule

DHCPv6

4rd-non-map-rule

99

4rd Non Map Rule

DHCPv6

6rd

212

IPv6 Rapid Deployment on IPv4 Infrastructures (6rd)

DHCPv4

access-domain

213

Access Network Domain Name

DHCPv4

access-domain

57

Access Network Domain Name

DHCPv6

addrsel

84

Address Selection

DHCPv6

addrsel-table

85

Address Selection Policy Table

DHCPv6

aftr-name

64

AFTR tunnel endpoint domain name

DHCPv6

all-subnets-local

27

All Subnets Are Local

Interface

andsf-v4

142

ANDSF IPv4 Address for DHCPv4

DHCPv4

ani-ap-bssid

108

DHCPv6 Access-Point-BSSID

DHCPv6

ani-ap-name

107

DHCPv6 Access-Point-Name

DHCPv6

ani-att

105

DHCPv6 Access-Technology-Type

DHCPv6

ani-network-name

106

DHCPv6 Network-Name

DHCPv6

ani-operator-id

109

DHCPv6 Operator-Identifier

DHCPv6

ani-operator-realm

110

DHCPv6 Operator-Realm

DHCPv6

arp-cache-timeout

35

ARP Cache Timeout

Interface

associated-ip

92

Lease Query Associated IP

DHCPv4

auth

11

Authentication

DHCPv6

authentication

90

Authentication

DHCPv4

auto-configure

116

Auto-Configuration

DHCPv4

base-time

152

base-time

DHCPv4

bcmcs-server-a

34

BCMCS Address v6

DHCPv6

bcmcs-server-d

33

BCMCS Controller Domain v6

DHCPv6

bcmcs-servers-a

89

BCMCS Address

DHCPv4

bcmcs-servers-d

88

BCMCS Controller Domain

DHCPv4

boot-file

67

Bootfile Name

BOOTP

boot-size

13

Boot File Size

BOOTP

bootfile-param

60

Boot File Parameters

DHCPv6

bootfile-url

59

Boot File Uniform Resource Locator (URL)

DHCPv6

broadcast-address

28

Broadcast Address

Interface

cablelabs-client-configuration

122

CableLabs Client Configuration

DHCPv4

captive-portal

103

Captive-Portal DHCPv6

DHCPv6

captive-portal

160

Captive-Portal DHCPv4

DHCPv4

capwap-ac-v4

138

CAPWAP AC

DHCPv4

capwap-ac-v6

52

CAPWAP AC

DHCPv6

cisco-auto-configure

251

Cisco Autoconfiguration

DHCPv4

cisco-client-last-transaction-time

163

Cisco Client Last Transaction Time

DHCPv4

cisco-client-requested-host-name

162

Cisco Client Requested Host Name

DHCPv4

cisco-vpn-id

221

Cisco VPN Identifier

DHCPv4

classless-static-route

121

Classless Static Route

DHCPv4

client-arch-type

61

Client System Architecture Type

DHCPv6

client-data

45

Leasequery Reply Client Data

DHCPv6

client-fqdn

81

DHCP Client FQDN

DHCPv4

client-fqdn

39

DHCP Client FQDN

DHCPv6

client-identifier

1

Client Identifier

DHCPv6

client-last-transaction-time

91

Leasequery Client Last Transaction Time

DHCPv4

client-linklayer-address

79

DHCPv6 Client Link-Layer Address

DHCPv6

clt-time

46

Leasequery Client Last Transaction Time

DHCPv6

cookie-servers

8

Cookie Server

BOOTP

data-source

157

data-source

DHCPv4

default-ip-ttl

23

Default IP Time-to-Live

Host IP

default-tcp-ttl

37

TCP Default TTL

Interface

dhcp-class-identifier

60

Vendor Class Identifier

DHCPv4

dhcp-client-identifier

61

Client-Identifier

Basic

dhcp-lease-time

51

IP Address Lease Time

Lease Information, MS DHCP Client

dhcp-max-message-size

57

Maximum DHCP Message Size

DHCPv4

dhcp-message

56

Message

DHCPv4

dhcp-message-type

53

DHCP Message Type

DHCPv4

dhcp-option-overload

52

Option Overload

DHCPv4

dhcp-parameter-request-list

55

Parameter Request List

DHCPv4

dhcp-rebinding-time

59

Rebinding (T2) Time Value

Lease Information, MS DHCP Client

dhcp-renewal-time

58

Renewing (T1) Time Value

Lease Information, MS DHCP Client

dhcp-requested-address

50

Requested IP Address

DHCPv4

dhcp-server-identifier

54

Server Identifier

DHCPv4

dhcp-state

156

State of IP Address

DHCPv4

dhcp-user-class-id

77

User Class ID

DHCPv4

dhcp4-o-dhcp6-server

88

DHCP 4o6 Server Address

DHCPv6

dhcp4o6-s46-saddr

109

DHCP 4o6 Softwire Source Address

DHCPv4

dhcpv4-msg

87

DHCPv4 Message

DHCPv6

dns-servers

23

DNS Recursive Name Server

DHCPv6

domain-list

24

Domain Search List

DHCPv6

domain-name

15

Domain Name

Basic, MS DHCP Client

domain-name-servers

6

Domain Name Server

Basic, MS DHCP Client

domain-search

119

Domain Search

DHCPv4

elapsed-time

8

Elapsed Time

DHCPv6

end

255

End

DHCPv4

ero

43

Relay Agent Echo Request Option

DHCPv6

erp-local-domain-name

65

Local ERP domain name

DHCPv6

extensions-path

18

Extensions Path

BOOTP

finger-servers

73

Finger Server

Servers

font-servers

48

X Window System Font Server

Servers

forcerenew-nonce-capable

145

Forcerenew Nonce Authentication

DHCPv4

geo-conf

123

GeoConf

DHCPv4

geoconf-civic

99

Civic Addresses Configuration

DHCPv4

geoconf-civic

36

Civic Addresses Configuration

DHCPv6

geoloc

63

Geolocation

DHCPv6

geoloc

144

Geospatial Location with Uncertainty

DHCPv4

host-name

12

Host Name

Basic

ia-na

3

Identity Association for Nontemporary Addresses

DHCPv6

ia-pd

25

Prefix Delegation

DHCPv6

ia-ta

4

Identity Association for Temporary Addresses

DHCPv6

iaaddr

5

IA Address

DHCPv6

iaprefix

26

IA Prefix

DHCPv6

ieee802.3-encapsulation

36

Ethernet Encapsulation

Interface

impress-servers

10

Impress Server

BOOTP

inf-max-rt

83

Max Information-Request Timeout

DHCPv6

info-refresh-time

32

Information Refresh Time

DHCPv6

initial-url

114

URL

DHCPv4

interface-id

18

Interface Identifier

DHCPv6

interface-mtu

26

Interface MTU

Interface

ip-forwarding

19

IP Forwarding Enable/Disable

Host IP

ipv6-address-andsf

143

ANDSF IPv6 Address

DHCPv6

irc-servers

74

IRC Server

Servers

iSNS

83

iSNS

DHCPv4

krb-default-realm-name

77

Kerberos Default Realm Name

DHCPv6

krb-kdc

78

Kerberos KDC

DHCPv6

krb-principal-name

75

Kerberos Principal Name

DHCPv6

krb-realm-name

76

Kerberos Realm Name

DHCPv6

ldap-url

95

Lightweight Directory Access Protocol (LDAP) Servers

DHCPv4

link-address

80

Link Address

DHCPv6

log-servers

7

Log Server

Servers

lost-server

51

Location-to-Service Translation (LoST) Server DHCPv6

DHCPv6

lost-server

137

LoST Server DHCPv4

DHCPv4

lpr-servers

9

LPR Server

Servers

lq-associated-ip

92

Leasequery Associated IP Address

DHCPv4

lq-base-time

100

Leasequery Base Time

DHCPv6

lq-client-last-transaction-time

91

Leasequery Client Transaction Time

DHCPv4

lq-client-links

48

Leasequery Client Link Reply

DHCPv6

lq-end-time

102

Leasequery End Time

DHCPv6

lq-query

44

Leasequery

DHCPv6

lq-relay-data

47

Leasequery Relay Agent Reply

DHCPv6

lq-start-time

101

Leasequery Start Time

DHCPv6

mask-supplier

30

Mask Supplier

Interface

max-dgram-reassembly

22

Maximum Datagram Reassembly Size

Host IP

mcns-security-server

128

--

Servers

merit-dump

14

Merit Dump File

DHCPv4

mip6-haa

72

MIPv6 Home Agent Address

DHCPv6

mip6-haf

73

MIPv6 Home Agent FQDN

DHCPv6

mip6-hnidf

49

MIPv6 Home Network ID FQDN

DHCPv6

mip6-hnp

71

MIPv6 Home Network Prefix

DHCPv6

mip6-idinf

69

MIPv6 Identified Home Network Information

DHCPv6

mip6-udinf

70

MIPv6 Unrestricted Home Network Information

DHCPv6

mip6-vdinf

50

MIPv6 Visited Home Network Information

DHCPv6

mobile-ip-home-agents

68

Mobile IP Home Agent

Servers

mos-address

139

MoS IPv4 Address

DHCPv4

mos-address

54

MoS IPv6 Address

DHCPv6

mos-fqdn

140

MoS Domain Name List

DHCPv4

mos-fqdn

55

MoS Domain Name List

DHCPv6

mpl-parameters

104

MPL Parameters

DHCPv6

mud-url

161

IPv4 MUD URL

DHCPv4

mud-url

112

IPv6 MUD URL

DHCPv6

name-servers

5

Name Server

BOOTP

name-service-search

117

Name Service Search

DHCPv4

nds-context

87

NDS Context

NetWare Client

nds-servers

85

NDS Servers

NetWare Client

nds-tree

86

NDS Tree Name

NetWare Client

netbios-dd-servers

45

NetBIOS over TCP/IP Datagram Distribution Server

WINS/NetBIOS

netbios-name-servers

44

NetBIOS over TCP/IP Name Server

WINS/NetBIOS, MS DHCP Client

netbios-node-type

46

NetBIOS over TCP/IP Node Type

WINS/NetBIOS, MS DHCP Client

netbios-scope

47

NetBIOS over TCP/IP Scope

WINS/NetBIOS, MS DHCP Client

netinfo-parent-server-addr

112

NetInfo Parent Server Address

DHCPv4

netinfo-parent-server-tag

113

NetInfo Parent Server Tag

DHCPv4

netwareip-domain

62

NetWare/IP Domain Name

NetWare Client

netwareip-information

63

NetWare/IP Information

NetWare Client

new-posix-timezone

41

POSIX time zone string

DHCPv6

new-tzdb-timezone

42

POSIX time zone database name

DHCPv6

nii

62

Client Network Interface Identifier

DHCPv6

nis+-domain

64

NIS+ Domain

Servers

nis+-servers

65

Network Information Service (NIS+) Servers

Servers

nis-domain

40

NIS Domain

Servers

nis-domain-name

29

NIS Domain Name

DHCPv6

nis-servers

41

Network Information Service (NIS) Servers

Servers

nis-servers

27

NIS Servers

DHCPv6

nisp-domain-name

30

NIS+ Domain Name

DHCPv6

nisp-servers

28

NIS+ Servers

DHCPv6

nntp-servers

71

NNTP Server

Servers

non-local-source-routing

20

Non-Local Source Routing

Host IP

ntp-server

56

Message

DHCPv6

ntp-servers

42

NTP Servers

Servers

option-time

8

Option Time

DHCPv6

oro

6

Option Request Option

DHCPv6

pad

0

Pad

DHCPv4

pana-agent

40

PANA Authentication Agent DHCPv6

DHCPv6

pana-agent

136

PANA Authentication Agent DHCPv4

DHCPv4

path-mtu-aging-timeout

24

Path MTU Aging Timeout

Host IP

path-mtu-plateau-tables

25

Path MTU Plateau Table

Host IP

pd-exclude

67

Prefix Exclude

DHCPv6

perform-mask-discovery

29

Perform Mask Discovery

Interface

policy-filters

21

Policy Filter

Host IP

pop3-servers

70

POP3 Server

Servers

posix-timezone

100

IEEE 1003.1 String

DHCPv4

preference

7

Preference

DHCPv6

prefix64

113

Prefix64

DHCPv6

pxe-client-arch

93

Client System Architecture Type

DHCPv4

pxe-client-machine-id

97

Client Machine Identifier

DHCPv4

pxe-client-network-id

94

Client Network Interface Identifier

DHCPv4

pxelinux-config-file

209

Configuration File

DHCPv4

pxelinux-path-prefix

210

Path Prefix

DHCPv4

pxelinux-reboot-time

211

Reboot Time

DHCPv4

query-end-time

155

query-end-time

DHCPv4

query-start-time

154

query-start-time

DHCPv4

radius

81

DHCPv6 RADIUS

DHCPv6

rapid-commit

80

Rapid Commit

DHCPv4

rapid-commit

14

Rapid Commit

DHCPv6

rdnss-selection

74

RDNSS Selection DHCPv6

DHCPv6

rdnss-selection

146

RDNSS Selection DHCPv4

DHCPv4

reconfigure-accept

20

Reconfigure Accept

DHCPv6

reconfigure-message

19

Reconfigure Message

DHCPv6

relay-agent-info

82

DHCP Relay Agent Information

DHCPv4

relay-agent-subscriber-id

38

Relay Agent Subscriber ID

DHCPv6

relay-id

53

Relay ID

DHCPv6

relay-message

9

Relay Message

DHCPv6

relay-port

135

Relay Source Port

DHCPv6

remote-id

37

Relay Agent Remote ID

DHCPv6

resource-location-servers

11

Resource Location Server

BOOTP

root-path

17

Root Path

BOOTP

router-discovery

31

Perform Router Discovery

Interface

router-solicitation-address

32

Router Solicitation Address

Interface

routers

3

Router

Basic, MS DHCP Client

rsoo

66

Relay-Supplied Options

DHCPv6

s46-br

90

Softwire46 (S46) Border Relay (BR)

DHCPv6

s46-cont-lw

96

S46 Lightweight 4over6 Container

DHCPv6

s46-cont-mape

94

S46 MAP-E Container

DHCPv6

s46-cont-mapt

95

S46 MAP-T Container

DHCPv6

s46-dmr

91

S46 Default Mapping Rule (DMR)

DHCPv6

s46-portparams

93

S46 Port Parameters

DHCPv6

s46-priority

111

S46 Priority

DHCPv6

s46-rule

89

S46 Rule

DHCPv6

s46-v4v6bind

92

S46 IPv4/IPv6 Address Binding

DHCPv6

s6-bind-ipv6-prefix

137

DHCPv6 Softwire Source Binding Prefix Hint

DHCPv6

server-identifier

2

DHCPv6 Server Identifier

DHCPv6

server-unicast

12

Server Unicast

DHCPv6

sip-servers

120

SIP Servers

DHCPv4

sip-servers-name

21

SIP Servers Domain Name List

DHCPv6

sip-servers-address

22

SIP Servers IPv6 Address List

DHCPv6

sip-ua-cs-domains

141

SIP UA Configuration Service Domains

DHCPv4

sip-ua-cs-domains

58

SIP User Agent Configuration Service Domains

DHCPv6

sip-ua-cs-domains

141

SIP User Agent Configuration Service Domains

DHCPv4

slp-directory-agent

78

SLP Directory Agent

DHCPv4

slp-service-scope

79

SLP Service Scope

DHCPv4

smtp-servers

69

SMTP Server

Servers

sntp-servers

31

SNTP Configuration

DHCPv6

sol-max-rt

82

SOL_MAX_RT

DHCPv6

start-time-of-state

153

start-time-of-state

DHCPv4

static-routes

33

Static Route

Interface

status-code

13

Status Code

DHCPv6

status-code

151

Status Code

DHCPv4

streettalk-directory- assistance-servers

76

STDA Server

Servers

streettalk-servers

75

StreetTalk Server

Servers

subnet-alloc

220

Subnet Allocation

DHCPv4

subnet-mask

1

Subnet Mask

Basic

subnet-selection

118

Subnet Selection

DHCPv4

swap-server

16

Swap Server

BOOTP

sztp-redirect

143

DHCPv4 SZTP Redirect

DHCPv4

sztp-redirect

136

DHCPv6 SZTP Redirect

DHCPv6

tcp-keepalive-garbage

39

TCP Keepalive Garbage

Interface

tcp-keepalive-interval

38

TCP Keepalive Interval

Interface

tftp-server

66

TFTP Server Name

Servers

tftp-server-address

150

TFTP Server Address

Servers

time-offset

2

Time Offset

BOOTP

time-servers

4

Time Server

BOOTP

trailer-encapsulation

34

Trailer Encapsulation

Interface

tzdb-timezone

101

TZ Database String

DHCPv4

user-auth

98

User Authentication

DHCPv4

user-class

15

User Class

DHCPv6

v-i-vendor-class

124

Vendor Identifying Vendor Class

DHCPv4

v-i-vendor-opts

125

Vendor Identifying Vendor Options

DHCPv4

v4-pcp-server

158

DHCPv4 PCP server

DHCPv4

v4-portparams

159

DHCPv4 Port Parameters

DHCPv4

v6-pcp-server

86

DHCPv6 PCP Server

DHCPv6

vendor-class

16

Vendor Class

DHCPv6

vendor-encapsulated-options

43

Vendor Specific Information

DHCPv4

vendor-opts

17

Vendor Specific Information

DHCPv6

vpn-id

68

VPN Identifier

DHCPv6

vpn-id

185

VPN Identifier

DHCPv4

www-servers

72

WWW Server

Servers

x-display-managers

49

X Window System Display Manager

Servers

AT_BLOB

List of binary bytes—binary

AT_BOOL

Boolean—boolean

AT_CONTAINER6

DHCPv6 Option Container (not usable for custom options)

AT_DATE

Bytes representing a date—date

AT_DNSNAME

DNS name—DNS name

AT_INT

Unsigned 32-bit integer—unsigned 32-bit

AT_INT8

8-bit integer—unsigned 8-bit

AT_INTI

Unsigned 32-bit integer (Intel)—unsigned 32-bit (Intel)

AT_IPADDR

32-bit IP address—IP address

AT_IP6ADDR

128-bit IPv6 address—IPv6 address

AT_MACADDR

Bytes representing a MAC address—MAC address

AT_MESSAGE

Unsigned 8-bit message (not usable for custom options)

AT_NOLEN

No length (used for PAD and END only)

AT_NSTRING

Sequence of ASCII characters—string

AT_OVERLOAD

Overload bytes (not usable for custom options)

AT_RANGEBYTE

Range of bytes (not usable for custom options)

AT_RANGESHORT

Range of shorts (not usable for custom options)

AT_RDNSNAME

Relative DNS name—relative DNS name

AT_SHORT

Unsigned 16-bit integer—unsigned 16-bit

AT_SHRTI

Unsigned 16-bit integer (Intel)—unsigned 16-bit (Intel)

AT_SINT

Signed 32-bit integer—signed 32-bit

AT_SINT8

8-bit integer—signed 8-bit

AT_SINTI

Signed 32-bit integer (Intel)—signed 32-bit (Intel)

AT_SSHORT

Signed 16-bit integer—signed 16-bit

AT_SSHRTI

Signed 16-bit integer (Intel)—signed 16-bit (Intel)

AT_STIME

Signed 32-bit signed integer representing time—signed time

AT_STRING

Unrestricted sequence of ASCII characters—string

AT_TIME

Unsigned 32-bit integer representing time—unsigned time

AT_TYPECNT

Type requiring two child definition: size of the type field, and type of data—counted-type:

For the DHCPv4 dhcp-user-class-id option (77), the repeating pattern is:

[ len (1 byte) ] [ data, of single type ]

For the DHCPv6 user-class option (15), the repeating pattern is:

[ len (2 byte) ] [ data, of single type ]

AT_VENDOR_CLASS

Vendor-class option (enterprise ID followed by opaque data; if DHCPv4, enterprise ID is followed by EID length)—vendor-class

AT_VENDOR_OPTS

Vendor-specific options data (enterprise ID followed by TLVs of vendor-specific data; if DHCPv4, enterprise ID is followed by EID length)—vendor-opts

AT_VPREFIX

IPv6 variable-length prefix

AT_ZEROSIZE

32 bits of zero size (no longer used for PAD and END)