Table Of Contents
DHCP Options
Option Descriptions
BOOTP Extensions/DHCP Option Field Format
RFC 1497 Vendor Extensions
IP Layer Parameters Per Host
IP Layer Parameters Per Interface
Link Layer Parameters Per Interface
TCP Parameters
Application and Service Parameters
DHCP Extensions
Microsoft Client Options
Option Tables
Options by Number
Options by Network Registrar Name
Options by Category
Option Validation Types
DHCP Options
DHCP provides a framework for passing configuration information to hosts on a TCP/IP network. Configuration parameters and other control information are carried in tagged data items that are stored in the options field of the DHCP message. The data items themselves are also called options.
This appendix contains DHCP options and BOOTP vendor extensions from RFC 2132, and includes the validation type for each option, as indicated in Table B-9.
This appendix also contains the standard Microsoft client options and several tables displaying the options sorted by categories.
Option Descriptions
The following sections describe the DHCP options in detail:
•
BOOTP Extensions/DHCP Option Field Format
•RFC 1497 Vendor Extensions
•IP Layer Parameters Per Host
•Link Layer Parameters Per Interface
•TCP Parameters
•Application and Service Parameters
•DHCP Extensions
•Microsoft Client Options
BOOTP Extensions/DHCP Option Field Format
DHCP options have the same format as the BOOTP vendor extensions defined in RFC 1497. Options can be fixed length or variable length. All options begin with a tag octet, which uniquely identifies the option. Fixed-length options without data consist of only a tag octet. Only options 0 and 255 are fixed length. All other options are variable-length with a length octet following the tag octet. The value of the length octet omits the two octets specifying the tag and length. The length octet is followed by that number of octets of data. Options containing NVT ASCII data should not include a trailing NULL; however, the receiver of such options must be prepared to delete trailing nulls if they exist. The receiver must not require that a trailing null be included in the data. In the case of some variable-length options, the length field must be specified.
Any options defined subsequent to this document must contain a length octet even if the length is fixed or zero. All multi-octet quantities are in network byte-order.
Except for the options in section 9, all options can be used with either DHCP or BOOTP. Many of these options have their default values specified in other documents. In particular, RFC 1122 [4] specifies default values for most IP and TCP configuration parameters.
Many options supply one or more 32-bit IP addresses. Use of IP addresses instead of DNS names can make future service migration more difficult. Use of IP addresses instead of DNS CNAMEs is not recommended.
When used with BOOTP, the first four octets of the vendor information field are reserved for a magic cookie (as suggested in RFC 951). This field identifies the mode in which the succeeding data is to be interpreted. The value of the magic cookie is the 4 octet dotted decimal 99.130.83.99 (or hexadecimal number 63.82.53.63) in network byte order.
All of the vendor extensions defined in RFC 1497 are also DHCP options.
Option codes 128 through 254 (decimal) are reserved for site-specific options.
RFC 1497 Vendor Extensions
Table B-1 lists the vendor extensions as defined in RFC 1497.
Table B-1 RFC 1497 Vendor Extension Options
Option Name
|
No.
|
Length
|
Description
|
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's 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's 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 octet minimum; multiples of 4
|
List of IP addresses for routers on the client's subnet. Routers should be in order of preference.
|
Time Server
|
4
|
4 octet 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 octet 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 octet 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 octet 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 octet 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 octet 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 octet 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 octet 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's 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 host names through the Domain Name System.
|
Swap Server
|
16
|
4 octets
|
IP address of the client's swap server.
|
Root Path
|
17
|
1 octet minimum
|
Path name that contains the client's 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 Layer Parameters Per Host
Table B-2 lists the options that affect the operation of the IP layer on a per-host basis.
Table B-2 IP Layer Parameters Per Host Options
Option Name
|
No.
|
Length
|
Description
|
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 octet 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
|
IP Layer Parameters Per Interface
Table B-3 lists the options that affect the operation of the IP layer on a per-interface basis. A client can issue multiple requests, one per interface, to configure interfaces with their specific parameters.
Table B-3 IP Layer Parameters Per Interface Options
Option Name
|
No.
|
Length
|
Description
|
Interface MTU
|
26
|
2 octets
|
Maximum time to live to use on this interface.
|
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's 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 octet 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.
|
Link Layer Parameters Per Interface
Table B-4 lists the options that affect the operation of the data link layer on a per-interface basis.
Table B-4 Link Layer Parameters Per Interface Options
Option Name
|
No.
|
Length
|
Description
|
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 Parameters
Table B-5 lists the options that affect the operation of the TCP layer on a per-interface basis.
Table B-5 TCP Parameter Options
Option Name
|
No.
|
Length
|
Description
|
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
|
Application and Service Parameters
Table B-6 lists some miscellaneous options used to configure miscellaneous applications and services.
Table B-6 Application and Service Parameter Options
Option Name
|
No.
|
Length
|
Description
|
Network Information Service (NIS) Domain
|
40
|
1 octet minimum
|
Name of the client's 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 octet 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 octet 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 vendor-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/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 no code 255 is 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 octet 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 octet 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 octet in hexadecimal 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 octet 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 octet 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's 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 octet 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 octets minimum; multiples of 4; expected, 4 octets (single home agent's 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 octet 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 octet 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 octet minimum; multiples of 4
|
List of NNTP servers available to the client. Servers should be in order of preference.
|
World Wide Web (WWW) Server
|
72
|
4 octet minimum; multiples of 4
|
List of World Wide Web (WWW) servers available to the client. Servers should be in order of preference.
|
Finger Server
|
73
|
4 octet minimum; multiples of 4
|
List of Finger servers available to the client. Servers should be in order of preference.
|
Internet Relay Chat Server
|
74
|
4 octet minimum; multiples of 4
|
List of IRC servers available to the client. Servers should be in order of preference.
|
StreetTalk Server
|
75
|
4 octet 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 octet minimum; multiples of 4
|
List of STDA servers available to the client. Servers should be in order of preference.
|
DHCP Extensions
This section describes the options that are specific to DHCP.
Table B-7 lists some options used to configure miscellaneous applications and services.
Table B-7 Application and Service Parameter Options
Option Name
|
No.
|
Length
|
Description
|
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 \ is 1 (DHCPDISCOVER).
Values: 1=DHCPDISCOVER; 2=DHCPOFFER; 3=DHCPREQUEST; 4=DHCPDECLINE; 5=DHCPACK; 6=DHCPNAK; 7=DHCPRELEASE; 8=DHCPINFORM
|
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's 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 octet
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's 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.
|
Microsoft Client Options
Table B-8 lists the standard Microsoft client options.
Table B-8 Microsoft DHCP Client Options
Option Name
|
No.
|
Description
|
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 Network Registrar displays a warning if it is not present
|
routers
|
3
|
IP address of the router for this subnet
|
Option Tables
The following tables display the DHCP options in various ways. They show the options sorted numerically, by Network Registrar name, and by category.
DHCP options have a prescribed format and allowed values for their option parameters. Table B-9 lists each DCHP option and parameter type (in the Validation column). The parameter formats and allowed values come from the DHCP and Internet RFCs. All the DHCP options appear, but clients control only some, and the CLI only others.
Options by Number
Table B-9 shows the DHCP options sorted by option number, and includes the validation type. (See Table B-12 for details on the option validation types found in the Validation column.)
Table B-9 DHCP Options by Number
No.
|
Network Registrar Name
|
Protocol Name
|
Category
|
Validation
|
--
|
packet-file-name
|
--
|
DHCP Packet Fields
|
STRING
|
--
|
packet-server-name
|
--
|
DHCP Packet Fields
|
STRING
|
--
|
packet-siaddr
|
--
|
DHCP Packet Fields
|
IPADDR
|
0
|
pad (set by protocol)
|
Pad
|
--
|
|
1
|
subnet-mask (derived)
|
Subnet Mask
|
Basic
|
IPADDR as mask
|
2
|
time-offset
|
Time Offset
|
BOOTP
|
INT
|
3
|
routers
|
Router
|
Basic,
MS DHCP Client
|
IPADDR_ARRAY
|
4
|
time-servers
|
Time Server
|
BOOTP
|
IPADDR_ARRAY
|
5
|
name-servers
|
Name Server
|
BOOTP
|
IPADDR_ARRAY
|
6
|
domain-name-servers
|
Domain Name
Server
|
Basic,
MS DHCP Client
|
IPADDR_ARRAY
|
7
|
log-servers
|
Log Server
|
Servers
|
IPADDR_ARRAY
|
8
|
cookie-servers
|
Cookie Server
|
BOOTP
|
IPADDR_ARRAY
|
9
|
lpr-servers
|
LPR Server
|
Servers
|
IPADDR_ARRAY
|
10
|
impress-servers
|
Impress Server
|
BOOTP
|
IPADDR_ARRAY
|
11
|
resource-location-servers
|
Resource
Location Server
|
BOOTP
|
IPADDR_ARRAY
|
12
|
host-name
|
Host Name
|
Basic
|
Hostname STRING
|
13
|
boot-size
|
Boot File Size
|
BOOTP
|
WORD (512-byte blocks
|
14
|
merit-dump
|
Merit Dump File
|
BOOTP
|
STRING
|
15
|
domain-name
|
Domain Name
|
Basic,
MS DHCP Client
|
STRING
|
16
|
swap-server
|
Swap Server
|
BOOTP
|
IPADDR
|
17
|
root-path
|
Root Path
|
BOOTP
|
STRING
|
18
|
extensions-path
|
Extensions Path
|
BOOTP
|
STRING
|
19
|
ip-forwarding
|
IP Forwarding
Enable/Disable
|
Host IP
|
BOOL
|
20
|
non-local-source-routing
|
Non-Local Source
Routing
|
Host IP
|
BOOL
|
21
|
policy-filters
|
Policy Filter
|
Host IP
|
Alternating IPADDR_ARRAY address/mask entries
|
22
|
max-dgram-reassembly
|
Maximum Datagram
Reassembly Size
|
Host IP
|
WORD
|
23
|
default-ip-ttl
|
Default IP
Time-to-Live
|
Host IP
|
BYTE
|
24
|
path-mtu-aging-timeout
|
Path MTU Aging
Timeout
|
Host IP
|
UINT
|
25
|
path-mtu-plateau-tables
|
Path MTU Plateau
Table
|
Host IP
|
WORD_ARRAY
|
26
|
interface-mtu
|
Interface MTU
|
Interface
|
WORD
|
27
|
all-subnets-local
|
All Subnets Are
Local
|
Interface
|
BOOL
|
28
|
broadcast-address
|
Broadcast Address
|
Interface
|
IPADDR (255.255.255.255)
|
29
|
perform-mask-discovery
|
Perform Mask
Discovery
|
Interface
|
BOOL
|
30
|
mask-supplier
|
Mask Supplier
|
Interface
|
BOOL
|
31
|
router-discovery
|
Perform Router
Discovery
|
Interface
|
BOOL
|
32
|
router-solicitation-
address
|
Router Solicitation
Address
|
Interface
|
IPADDR
|
33
|
static-routes
|
Static Route
|
Interface
|
IPADDR_ARRAY
|
34
|
trailer-encapsulation
|
Trailer Encapsulation
|
Interface
|
BOOL
|
35
|
arp-cache-timeout
|
ARP Cache Timeout
|
Interface
|
UINT
|
36
|
ieee802.3-encapsulation
|
Ethernet Encapsulation
|
Interface
|
BOOL
|
37
|
default-tcp-ttl
|
TCP Default TTL
|
Interface
|
BYTE > 0
|
38
|
tcp-keepalive-interval
|
TCP Keepalive
Interval
|
Interface
|
UINT
|
39
|
tcp-keepalive-garbage
|
TCP Keepalive
Garbage
|
Interface
|
BOOL
|
40
|
nis-domain
|
NIS Domain
|
Servers
|
STRING
|
41
|
nis-servers
|
Network Information Service (NIS) Servers
|
Servers
|
IPADDR_ARRAY
|
42
|
ntp-servers
|
NTP Servers
|
Servers
|
IPADDR_ARRAY
|
43
|
vendor-encapsulated-
options
|
Vendor-Specific
Information
|
--
|
BYTE_ARRAY
|
44
|
netbios-name-servers
|
NetBIOS over TCP/IP
Name Server
|
WINS/NetBIOS,
MS DHCP Client
|
IPADDR_ARRAY
|
45
|
netbios-dd-servers
|
NetBIOS over TCP/IP
Datagram Distribution
Server
|
WINS/NetBIOS
|
IPADDR_ARRAY
|
46
|
netbios-node-type
|
NetBIOS over
TCP/IP Node Type
|
WINS/NetBIOS,
MS DHCP Client
|
BYTE (1, 2, 4, 8)
|
47
|
netbios-scope
|
NetBIOS over
TCP/IP Scope
|
WINS/NetBIOS,
MS DHCP Client
|
STRING
|
48
|
font-servers
|
X Window System
Font Server
|
Servers
|
IPADDR_ARRAY
|
49
|
x-display-managers
|
X Window System
Display Manager
|
Servers
|
IPADDR_ARRAY
|
50
|
dhcp-requested-address
(set by DHCP client)
|
Requested IP Address
|
--
|
IPADDR
|
51
|
dhcp-lease-time
|
IP Address Lease
Time
|
Lease Information,
MS DHCP Client
|
UINT
|
52
|
dhcp-option-overload
|
Option Overload
|
--
|
BYTE
|
53
|
dhcp-message-type
(set by protocols)
|
DHCP Message Type
|
--
|
BYTE
|
54
|
dhcp-server-identifier
(set by DHCP server)
|
Server Identifier
|
--
|
IPADDR
|
55
|
dhcp-parameter-request-
list
|
Parameter Request
List
|
--
|
BYTE_ARRAY
|
56
|
dhcp-message
|
Message
|
--
|
STRING
|
57
|
dhcp-max-message-size
(set by protocol)
|
Maximum DHCP
Message Size
|
--
|
WORD
|
58
|
dhcp-renewal-time
|
Renewing (T1)
Time Value
|
Lease Information,
MS DHCP Client
|
UINT
|
59
|
dhcp-rebinding-time
|
Rebinding (T2)
Time Value
|
Lease Information,
MS DHCP Client
|
UINT
|
60
|
dhcp-class-identifier
(set by DHCP client)
|
Vendor Class Identifier
|
--
|
STRING
|
61
|
dhcp-client-identifier
(set by DHCP client)
|
Client-Identifier
|
Basic
|
BYTE_ARRAY
|
62
|
netwareip-domain
|
NetWare/IP
Domain Name
|
NetWare Client
|
STRING
|
63
|
netwareip-information
|
NetWare/IP
Information
|
NetWare Client
|
BYTE_ARRAY
|
64
|
nis+-domain
|
NIS+ Domain
|
Servers
|
STRING
|
65
|
nis+-servers
|
NIS+ Servers
|
Servers
|
IPADDR_ARRAY
|
66
|
tftp-server
|
TFTP Server Name
|
Servers
|
STRING
|
67
|
boot-file
|
Bootfile Name
|
BOOTP
|
STRING
|
68
|
mobile-ip-home-agents
|
Mobile IP Home Agent
|
Servers
|
IPADDR_ARRAY
|
69
|
smtp-servers
|
SMTP Server
|
Servers
|
IPADDR_ARRAY
|
70
|
pop3-servers
|
POP3 Server
|
Servers
|
IPADDR_ARRAY
|
71
|
nntp-servers
|
NNTP Server
|
Servers
|
IPADDR_ARRAY
|
72
|
www-servers
|
WWW Server
|
Servers
|
IPADDR_ARRAY
|
73
|
finger-servers
|
Finger Server
|
Servers
|
IPADDR_ARRAY
|
74
|
irc-servers
|
IRC Server
|
Servers
|
IPADDR_ARRAY
|
75
|
streettalk-servers
|
StreetTalk Server
|
Servers
|
IPADDR_ARRAY
|
76
|
streettalk-directory-
assistance-servers
|
STDA Server
|
Servers
|
IPADDR_ARRAY
|
77
|
dhcp-user-class-id
(set by DHCP client)
|
--
|
--
|
STRING
|
81
|
client-fqdn
|
DHCP Client FQDN
|
--
|
BYTE_ARRAY
|
82
|
relay-agent-info
|
DHCP Relay Agent
Information
|
(for suboptions, see relay-agent-info, page C-4)
|
BYTE_ARRAY
|
85
|
nds-servers
|
NDS Servers
|
NetWare Client
|
IPADDR_ARRAY
|
86
|
nds-tree
|
NDS Tree Name
|
NetWare Client
|
STRING
|
87
|
nds-context
|
NDS Context
|
NetWare Client
|
STRING
|
118
|
subnet-selection
|
Subnet Selection
|
--
|
IPADDR
|
122
|
cablelabs-client-
configuration
|
CableLabs Client Configuration
|
(for suboptions, see cablelabs-client- configuration, page C-2)
|
BYTE_ARRAY
|
128
|
mcns-security-server
|
--
|
Servers
|
IPADDR
|
185
|
vpn-id
|
VPN Identifier
|
--
|
BYTE_ARRAY (structured)
|
220
|
cisco-subnet-allocation
|
Cisco Subnet Allocation
|
--
|
BYTE_ARRAY (structured)
|
221
|
cisco-vpn-id
|
Cisco VPN Identifier
|
--
|
BYTE_ARRAY (structured)
|
251
|
auto-configure
|
Autoconfiguration
|
--
|
BYTE
|
255
|
end (set by protocol)
|
End
|
--
|
|
Options by Network Registrar Name
Table B-10 lists the DHCP options by Network Registrar name. (For each option's validation type, cross-reference it by number to Table B-9 and check the Validation column.)
Table B-10 DHCP Options by Network Registrar Name
Network Registrar Name
|
Number
|
Option Name
|
Category
|
all-subnets-local
|
27
|
All Subnets Are Local
|
Interface
|
arp-cache-timeout
|
35
|
ARP Cache Timeout
|
Interface
|
boot-file
|
67
|
Bootfile Name
|
BOOTP
|
boot-size
|
13
|
Boot File Size
|
BOOTP
|
broadcast-address
|
28
|
Broadcast Address
|
Interface
|
cablelabs-client-configuration
|
122
|
CableLabs Client Configuration
|
Interface
|
cisco-subnet-allocation
|
220
|
Cisco Subnet Allocation
|
--
|
cisco-vpn-id
|
221
|
Cisco VPN Identifier
|
--
|
client-fqdn
|
81
|
DHCP Client FQDN
|
(proposed)
|
cookie-servers
|
8
|
Cookie Server
|
BOOTP
|
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
|
--
|
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
|
--
|
dhcp-message-type
|
53
|
DHCP Message Type
|
--
|
dhcp-message
|
56
|
Message
|
--
|
dhcp-option-overload
|
52
|
Option Overload
|
--
|
dhcp-parameter-request-list
|
55
|
Parameter Request List
|
--
|
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
|
--
|
dhcp-server-identifier
|
54
|
Server Identifier
|
--
|
dhcp-user-class-id
|
77
|
--
|
--
|
domain-name
|
15
|
Domain Name
|
Basic, MS DHCP Client
|
domain-name-servers
|
6
|
Domain Name Server
|
Basic, MS DHCP Client
|
end
|
255
|
End
|
--
|
extensions-path
|
18
|
Extensions Path
|
BOOTP
|
finger-servers
|
73
|
Finger Server
|
Servers
|
font-servers
|
48
|
X Window System
Font Server
|
Servers
|
host-name
|
12
|
Host Name
|
Basic
|
ieee802.3-encapsulation
|
36
|
Ethernet Encapsulation
|
Interface
|
impress-servers
|
10
|
Impress Server
|
BOOTP
|
interface-mtu
|
26
|
Interface MTU
|
Interface
|
ip-forwarding
|
19
|
IP Forwarding
Enable/Disable
|
Host IP
|
irc-servers
|
74
|
IRC Server
|
Servers
|
log-servers
|
7
|
Log Server
|
Servers
|
lpr-servers
|
9
|
LPR Server
|
Servers
|
mask-supplier
|
30
|
Mask Supplier
|
Interface
|
max-dgram-reassembly
|
22
|
Maximum Datagram
m Reassembly Size
|
Host IP
|
mcns-security-server
|
128
|
--
|
Servers
|
merit-dump
|
14
|
Merit Dump File
|
BOOTP
|
mobile-ip-home-agents
|
68
|
Mobile IP Home Agent
|
Servers
|
name-servers
|
5
|
Name Server
|
BOOTP
|
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
|
netwareip-domain
|
62
|
NetWare/IP Domain Name
|
NetWare Client
|
netwareip-information
|
63
|
NetWare/IP Information
|
NetWare Client
|
nis+-domain
|
64
|
NIS+ Domain
|
Servers
|
nis+-servers
|
65
|
Network Information Service (NIS+) Servers
|
Servers
|
nis-domain
|
40
|
NIS Domain
|
Servers
|
nis-servers
|
41
|
Network Information Service (NIS) Servers
|
Servers
|
nntp-servers
|
71
|
NNTP Server
|
Servers
|
non-local-source-routing
|
20
|
Non-Local Source Routing
|
Host IP
|
ntp-servers
|
42
|
NTP Servers
|
Servers
|
packet-file-name
|
--
|
--
|
DHCP Packet Fields
|
packet-server-name
|
--
|
--
|
DHCP Packet Fields
|
packet-siaddr
|
--
|
--
|
DHCP Packet Fields
|
pad
|
0
|
Pad
|
--
|
path-mtu-aging-timeout
|
24
|
Path MTU Aging Timeout
|
Host IP
|
path-mtu-plateau-tables
|
25
|
Path MTU Plateau Table
|
Host IP
|
perform-mask-discovery
|
29
|
Perform Mask Discovery
|
Interface
|
policy-filters
|
21
|
Policy Filter
|
Host IP
|
pop3-servers
|
70
|
POP3 Server
|
Servers
|
relay-agent-info
|
82
|
DHCP Relay Agent
Information
|
--
|
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
|
smtp-servers
|
69
|
SMTP Server
|
Servers
|
static-routes
|
33
|
Static Route
|
Interface
|
streettalk-directory-
assistance-servers
|
76
|
STDA Server
|
Servers
|
streettalk-servers
|
75
|
StreetTalk Server
|
Servers
|
subnet-mask
|
1
|
Subnet Mask
|
Basic
|
swap-server
|
16
|
Swap Server
|
BOOTP
|
tcp-keepalive-garbage
|
39
|
TCP Keepalive Garbage
|
Interface
|
tcp-keepalive-interval
|
38
|
TCP Keepalive Interval
|
Interface
|
tftp-server
|
66
|
TFTP Server Name
|
Servers
|
time-offset
|
2
|
Time Offset
|
BOOTP
|
time-servers
|
4
|
Time Server
|
BOOTP
|
trailer-encapsulation
|
34
|
Trailer Encapsulation
|
Interface
|
vendor-encapsulated-options
|
43
|
Vendor Specific Information
|
--
|
vpn-id
|
185
|
VPN Identifier
|
--
|
www-servers
|
72
|
WWW Server
|
Servers
|
x-display-managers
|
49
|
X Window System
Display Manager
|
Servers
|
Options by Category
Table B-11 list each option by category. (For each option's validation type, cross-reference it by number to Table B-9 and check the Validation column.)
Table B-11 DHCP Options by Category
Category
|
Number
|
Network Registrar Name
|
Option Name
|
--
|
0
|
pad
|
Pad
|
--
|
43
|
vendor-encapsulated-options
|
Vendor Specific Information
|
--
|
50
|
dhcp-requested-address
|
Requested IP Address
|
--
|
52
|
dhcp-option-overload
|
Option Overload
|
--
|
53
|
dhcp-message-type
|
DHCP Message Type
|
--
|
54
|
dhcp-server-identifier
|
Server Identifier
|
--
|
55
|
dhcp-parameter-request-list
|
Parameter Request List
|
--
|
56
|
dhcp-message
|
Message
|
--
|
57
|
dhcp-max-message-size
|
Maximum DHCP Message Size
|
--
|
60
|
dhcp-class-identifier
|
Vendor Class Identifier
|
--
|
77
|
dhcp-user-class-id
|
--
|
--
|
82
|
relay-agent-info
|
--
|
--
|
122
|
cablelabs-client-configuration
|
--
|
--
|
255
|
end
|
End
|
Basic
|
1
|
subnet-mask
|
Subnet Mask
|
Basic
|
3
|
routers
|
Router
|
Basic
|
6
|
domain-name-servers
|
Domain Name Server
|
Basic
|
12
|
host-name
|
Host Name
|
Basic
|
15
|
domain-name
|
Domain Name
|
Basic
|
61
|
dhcp-client-identifier
|
Client-Identifier
|
BOOTP
|
2
|
time-offset
|
Time Offset
|
BOOTP
|
4
|
time-servers
|
Time Server
|
BOOTP
|
5
|
name-servers
|
Name Server
|
BOOTP
|
8
|
cookie-servers
|
Cookie Server
|
BOOTP
|
10
|
impress-servers
|
Impress Server
|
BOOTP
|
11
|
resource-location-servers
|
Resource Location Server
|
BOOTP
|
13
|
boot-size
|
Boot File Size
|
BOOTP
|
14
|
merit-dump
|
Merit Dump File
|
BOOTP
|
16
|
swap-server
|
Swap Server
|
BOOTP
|
17
|
root-path
|
Root Path
|
BOOTP
|
18
|
extensions-path
|
Extensions Path
|
BOOTP
|
67
|
boot-file
|
Bootfile Name
|
DHCP Packet Fields
|
--
|
packet-file-name
|
--
|
DHCP Packet Fields
|
--
|
packet-server-name
|
--
|
DHCP Packet Fields
|
--
|
packet-siaddr
|
--
|
Host IP
|
19
|
ip-forwarding
|
IP Forwarding Enable/Disable
|
Host IP
|
20
|
non-local-source-routing
|
Non-Local Source Routing
|
Host IP
|
21
|
policy-filters
|
Policy Filter
|
Host IP
|
22
|
max-dgram-reassembly
|
Maximum Datagram Reassembly Size
|
Host IP
|
23
|
default-ip-ttl
|
Default IP Time-to-Live
|
Host IP
|
24
|
path-mtu-aging-timeout
|
Path MTU Aging Timeout
|
Host IP
|
25
|
path-mtu-plateau-tables
|
Path MTU Plateau Table
|
Interface
|
26
|
interface-mtu
|
Interface MTU
|
Interface
|
27
|
all-subnets-local
|
All Subnets Are Local
|
Interface
|
28
|
broadcast-address
|
Broadcast Address
|
Interface
|
29
|
perform-mask-discovery
|
Perform Mask Discovery
|
Interface
|
30
|
mask-supplier
|
Mask Supplier
|
Interface
|
31
|
router-discovery
|
Perform Router Discovery
|
Interface
|
32
|
router-solicitation-address
|
Router Solicitation Address
|
Interface
|
33
|
static-routes
|
Static Route
|
Interface
|
34
|
trailer-encapsulation
|
Trailer Encapsulation
|
Interface
|
35
|
arp-cache-timeout
|
ARP Cache Timeout
|
Interface
|
36
|
ieee802.3-encapsulation
|
Ethernet Encapsulation
|
Interface
|
37
|
default-tcp-ttl
|
TCP Default TTL
|
Interface
|
38
|
tcp-keepalive-interval
|
TCP Keepalive Interval
|
Interface
|
39
|
tcp-keepalive-garbage
|
TCP Keepalive Garbage
|
Lease Information
|
51
|
dhcp-lease-time
|
IP Address Lease Time
|
Lease Information
|
58
|
dhcp-renewal-time
|
Renewing (T1) Time Value
|
Lease Information
|
59
|
dhcp-rebinding-time
|
Rebinding (T2) Time Value
|
Microsoft DHCP Client
|
3
|
routers
|
Router
|
Microsoft DHCP Client
|
6
|
domain-name-servers
|
Domain Name Server
|
Microsoft DHCP Client
|
15
|
domain-name
|
Domain Name
|
Microsoft DHCP Client
|
44
|
netbios-name-servers
|
NetBIOS over TCP/IP Name Server
|
Microsoft DHCP Client
|
46
|
netbios-node-type
|
NetBIOS over TCP/IP Node Type
|
Microsoft DHCP Client
|
47
|
netbios-scope
|
NetBIOS over TCP/IP Scope
|
Microsoft DHCP Client
|
51
|
dhcp-lease-time
|
IP Address Lease Time
|
Microsoft DHCP Client
|
58
|
dhcp-renewal-time
|
Renewing (T1) Time Value
|
Microsoft DHCP Client
|
59
|
dhcp-rebinding-time
|
Rebinding (T2) Time Value
|
NetWare Client
|
62
|
netwareip-domain
|
NetWare/IP Domain Name
|
NetWare Client
|
63
|
netwareip-information
|
NetWare/IP Information
|
NetWare Client
|
85
|
nds-servers
|
NDS Servers
|
NetWare Client
|
86
|
nds-tree
|
NDS Tree Name
|
NetWare Client
|
87
|
nds-context
|
NDS Context
|
Servers
|
7
|
log-servers
|
Log Server
|
Servers
|
9
|
lpr-servers
|
LPR Server
|
Servers
|
40
|
nis-domain
|
NIS Domain
|
Servers
|
41
|
nis-servers
|
Network Information Service (NIS) Servers
|
Servers
|
42
|
ntp-servers
|
NTP Servers
|
Servers
|
48
|
font-servers
|
X Window System Font Server
|
Servers
|
49
|
x-display-managers
|
X Window System Display Manager
|
Servers
|
64
|
nis+-domain
|
NIS+ Domain
|
Servers
|
65
|
nis+-servers
|
NIS+ Servers
|
Servers
|
66
|
tftp-server
|
TFTP Server Name
|
Servers
|
68
|
mobile-ip-home-agents
|
Mobile IP Home Agent
|
Servers
|
69
|
smtp-servers
|
SMTP Server
|
Servers
|
70
|
pop3-servers
|
POP3 Server
|
Servers
|
71
|
nntp-servers
|
NNTP Server
|
Servers
|
72
|
www-servers
|
WWW Server
|
Servers
|
73
|
finger-servers
|
Finger Server
|
Servers
|
74
|
irc-servers
|
IRC Server
|
Servers
|
75
|
streettalk-servers
|
StreetTalk Server
|
Servers
|
76
|
streettalk-directory-
assistance-servers
|
STDA Server
|
Servers
|
128
|
mcns-security-server
|
--
|
WINS/NetBIOS
|
44
|
netbios-name-servers
|
NetBIOS over TCP/IP Name Server
|
WINS/NetBIOS
|
45
|
netbios-dd-servers
|
NetBIOS over TCP/IP Datagram Distribution Server
|
WINS/NetBIOS
|
46
|
netbios-node-type
|
NetBIOS over TCP/IP Node Type
|
WINS/NetBIOS
|
47
|
netbios-scope
|
NetBIOS over TCP/IP Scope
|
Option Validation Types
Table B-12 defines the DHCP option validation types.
Table B-12 Validation Types
Validation
|
Format and Allowed Values
|
BOOL
|
Boolean value. Represents the state of an enabled or disabled option.
|
BYTE
|
Unrestricted sequence of octets.
|
BYTE_ARRAY
|
List of BYTES.Unrestricted sequence of octets.
|
INT
|
32-bit integer value. Maximum range of values: - 2147483648 through 2147483647.
|
IPADDR
|
IP address as 32-bit number, entered as a quadruple-octet (numbers ranging from 0-255) with decimal points separating the octet numbers.
Some IP addresses are subnet masks, as per RFC 950. A subnet mask is a 32-bit number, entered in IP Address format, starting with 0 or more bits, with the remaining bits set to zero. Nine numbers can appear in a subnet mask— 0, 128, 192, 224, 240, 248, 252, 254, and 255. The subnet-mask option is an exception: it accepts any valid IP address, even invalid masks.
|
IPADDR_ARRAY
|
List containing at least one IP address. See IPADDR for format and allowed values of each list member.
|
STRING
|
Unrestricted sequence of ASCII characters (from 1 through 255). A hostname string may or may not be qualified with the local domain name (see RFC 1035). The grammar for hostnames is:
•domain ::= <subdomain> | " "
•<subdomain> ::= <label> | <subdomain> "." <label>
•<label> ::= <ldh-str> <let-dig>
•<ldh-str> ::= <let-dig-hyp> | <let-dig-hyp> <ldh-str>
•<let-dig-hyp> ::= <let-dig> | `-`
•<let-dig> ::= <letter> | <digit>
•<letter> ::= any one of the 52 alphabetic characters `A' through `Z' in uppercase and `a' through `z' in lowercase.
•<digit> ::= any one of the ten digits `0' through `9'
|
UINT
|
32-bit unsigned value. Represents a count, size or duration. Can have a range of allowed values associated with a given option. Maximum range of values: 0 through 4294967295.
|
WORD
|
16-bit unsigned value. Represents a count, size or duration. Can have a range of allowed values associated with a given option. Maximum range of values: 0 through 65535.
|
WORD_ARRAY
|
List containing at least one WORD. See WORD for format and allowed values of each list member.
|
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