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An option space is a collection of options. The application supports only the predefined DHCP option space, which contains the industry standard options as well as additional options you can configure as needed:

  • Predefined options: These are option codes 0 to 124. They are allocated by the IANA and defined by IETF standards. The DHCP server knows these standard options, and they are predefined on the server. You cannot redefine these options or delete them from the DHCP option space.

  • Custom options: These are option codes 125 to 255. They are not defined by IETF standards and are available for private use. You can use these option codes to provide configuration or service information that none of the predefined options provide.

Note that custom options defined in the DHCP option space are included in the options section of the DHCP messages that DHCP servers and clients exchange.  

DHCP Option Data Types

Each DHCP option is identified by a name and an option code number, and specifies a data type. The data type for predefined options is predefined. For example, in the DHCP option space, the data type for option 1: subnet-mask is an IP address. You cannot change the data type for this option.

BloxOne DDI supports predefined options that contains the following standard option codes:

Name

Code

Type

Array

 subnet-mask

1

address4


time-offset

2

int32


 routers

3

address4

true

 time-servers

4

address4

true

name-servers

5

address4

true

domain-name-servers

6

address4

true

log-servers

7

address4

true

cookie-servers

8

address4

true

lpr-servers

9

address4

true

impress-servers

10

address4

true

resource-location-servers

11

address4

true

boot-size

13

uint16


merit-dump

14

text


domain-name

15

fqdn


swap-server

16

address4


root-path

17

text


extensions-path

18

text


ip-forwarding

19

boolean


non-local-source-routing

20

boolean


policy-filter

21

address4

true

max-dgram-reassembly

22

uint16


default-ip-ttl

23

uint8


path-mtu-aging-timeout

24

uint32


path-mtu-plateau-table

25

uint16

true

interface-mtu

26

uint16


all-subnets-local

27

boolean


broadcast-address

28

address4


perform-mask-discovery

29

boolean


mask-supplier

30

boolean


router-discovery

31

boolean


router-solicitation-address

32

address4


static-routes

33

address4

true

trailer-encapsulation

34

boolean


arp-cache-timeout

35

uint32


ieee802-3-encapsulation

36

boolean


default-tcp-ttl

37

uint8


tcp-keepalive-interval

38

uint32


tcp-keepalive-garbage

39

boolean


nis-domain

40

text


nis-servers

41

address4

true

ntp-servers

42

address4

true

vendor-encapsulated-options

43

empty


netbios-name-servers

44

address4

true

netbios-dd-server

45

address4

true

netbios-node-type

46

uint8


netbios-scope

47

text


font-servers

48

address4

true

x-display-manager

49

address4

true

dhcp-option-overload

52

uint8


dhcp-server-identifier

54

address4


dhcp-message

56

text


dhcp-max-message-size

57

uint16


vendor-class-identifier

60

hex


nwip-domain-name

62

text


nisplus-domain-name

64

text


nisplus-severs

65

address4

true

tftp-server-name

66

text


boot-file-name

67

text


mobile-ip-home-agent

68

address4

true

smtp-server

69

address4

true

pop-server

70

address4

true

nntp-server

71

address4

true

www.-server

72

address4

true

finger-server

73

address4

true

irc-server

74

address4

true

streettalk-server

75

address4

true

streettalk-directory-assistance-server

76

address4

true

user-class

77

hex


slp-directory-agent

78

hex*


slp-service-scope

79

hex*


nds-server

85

address4

true

nds-tree-name

86

text


nds-context

87

text


bcms-controller-names

88

fqdn

true

bcms-controller-address

89

address4

true

client-system

93

uint16

true

client-ndi

94

hex*


uuid-guid

97

hex*


uap-servers

98

text


geoconf-civic

99

hex


pcode

100

text


tcode

101

text


netinfo-server-address

112

address4

true

netinfo-server-tag

113

text


default-url

114

text


auto-config

116

uint8


name-server-search

117

uint16

true

subnet-selection

118

address4


domain-search

119

fqdn

true

vivco-suboptions

124

hex


vivso-suboptions

125

hex


pana-agent

136

address4

true

v4-lost

137

fqdn


capwap-ac-v4

138

address4

true

sip-ua-cs-domains

142

fqdn

true

rdnss-selection

146

hex*


v4-portparams

159

hex*


v4-captive-portal

160

text


option-6rd

212

hex*


v4-access-domain

213

fqdn


(*) Records are not supported. Use hex.

Viewing Option Spaces

To view the list of option spaces:

  1. From the Cloud Services Portal, click Manage -> IPAM/DHCP -> Option Spaces.

  2. The application displays the following information:

    • NAME: The name of the option space.
    • DESCRIPTION: Additional information about the option space.

You can also do the following in this tab:

  • Click to reorder the columns.

  • Click  -> Edit or select the check box for the respective record and click the Edit button to modify an option space.

  • Click -> Delete or select the respective record and click the Delete button to delete an option space.

  • Select an option space to view additional details. If you do not want to view the details in the right panel, click .

  • Enter the value that you want to search in the Search text box. The application displays the list of records matching the keyword in the text box.

  • Click to filter the objects by name and description.

Creating Option Spaces

You can define basic DHCP options that the DHCP server uses to provide configuration information to DHCP clients. The server includes these options in its DHCP messages.

To create an option space:

  1. From the Cloud Services Portal, click Manage -> IPAM/DHCP -> Option Spaces -> Create Option Space.

  2. On the Create Option Space page, specify the following:

    • Name: Enter a name for the option space.
    • Description: Enter additional information about the option space. 
    • OPTIONS CODE: Click Add to associate option codes with the option space or click Remove to delete the entry. Complete the following to associate option codes:
      • Code: Select an option code from the drop-down list. You must select the client option code to match and you can select a value from 0 to 255. Select a number between 126 and 254 if you are adding custom options to the DHCP option space. If you are adding custom options to an IPv4 option space you configured, you can enter a number between 1 and 254.
      • Type: Select a type from the drop-down list. You can select the option type (such as ip-address, text, boolean, and string). For example, to create an option that defines the IP addresses of a server, enter the name of the server, select option code 126, and then select the type as ip-address.
      • Name: Enter a value for the type.
      • User Entry: Select the check box Accept multiple values for an array.
  3. Click Save & Close to save the details or click Cancel to exit.

Modifying Option Spaces

To modify an option space:

  1. From the Cloud Services Portal, click Manage -> IPAM/DHCP -> Option Spaces.

  2. Click -> Edit or select the respective record and click the Edit button to modify an option space.

  3. Modify the details and click Save & Close to save the record or click Cancel to cancel.

Deleting Option Spaces

To delete an option space:

  1. From the Cloud Services Portal, click Manage -> IPAM/DHCP -> Option Spaces.

  2. Click -> Delete or select the respective record and click the Delete button to modify an option space.  

  3. A confirmation message is displayed. Click Delete to delete an option space or click Cancel to cancel the operation.

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