DHCP properties configured at the IP Space level apply to the DHCP configuration falling underneath this IP Space, for example address block, subnet, etc. You can choose to keep the inherited properties or override them when you configure the properties for an object. For example, you can override the values of DHCP properties inherited from a parent object and enter unique values for a network that is configured for DHCP.
Note
The inheritance configuration is set to Inherit by default while configuring via the Infoblox Portal or API. You must explicitly choose Override from the Infoblox Portal or API to choose a custom value.
Overriding an Inherited Value from the Infoblox Portal
To override an inherited value, complete the following:
1. Toggle Override.
2. Enter a new value.
Overriding an Inherited Value from the API
To override an inherited value from the API, specify the following:
"inheritance_sources": { "dhcp_config": { "dhcp_config_item_x": { "action": "override" } } }
Here is an example of global parameters:
{ "result": { "address": "10.1.0.0", "asm_config": { "asm_threshold": 0, "enable": true, "enable_notification": true, "forecast_period": 14, "growth_factor": 0, "growth_type": "percent", "history": 30, "min_total": 10, "min_unused": 0, "reenable_date": "1970-01-01T00:00:00Z" }, "asm_scope_flag": 0, "cidr": 24, "comment": "", "compartment_id": "", "created_at": "2020-01-13T16:44:15.996060Z", "ddns_client_update": "client", "ddns_conflict_resolution_mode": "check_with_dhcid", "ddns_domain": "", "ddns_generate_name": false, "ddns_generated_prefix": "myhost", "ddns_send_updates": true, "ddns_ttl_percent": 0, "ddns_update_on_renew": false, "ddns_use_conflict_resolution": true, "delegation": "", "dhcp_config": { "abandoned_reclaim_time": 0, "abandoned_reclaim_time_v6": 0, "allow_unknown": true, "allow_unknown_v6": true, "echo_client_id": true, "filters": [], "filters_large_selection": [], "filters_v6": [], "ignore_client_uid": false, "ignore_list": [], "lease_time": 3600, "lease_time_v6": 3600 }, "dhcp_options": [], "dhcp_utilization": { "dhcp_free": "0", "dhcp_total": "0", "dhcp_used": "0", "dhcp_utilization": 0 }, "discovery_attrs": null, "discovery_metadata": null, "external_keys": null, "federated_realms": [], "header_option_filename": "", "header_option_server_address": "", "header_option_server_name": "", "hostname_rewrite_char": "", "hostname_rewrite_enabled": false, "hostname_rewrite_regex": "", "id": "ipam/address_block/ef9bd21e-3623-11ea-91fd-8af3e42772cf", "inheritance_parent": "ipam/address_block/cbb6a009-c80e-11e9-8757-0a586460226b", "inheritance_sources": { "asm_config": { "asm_enable_block": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": { "enable": true, "enable_notification": true, "reenable_date": "1970-01-08T01:01:00Z" } }, "asm_growth_block": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": { "growth_factor": 20, "growth_type": "count" } }, "asm_threshold": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": 12 }, "forecast_period": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": 14 }, "history": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": 30 }, "min_total": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": 10 }, "min_unused": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": 20 } }, "ddns_client_update": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": "ignore" }, "ddns_conflict_resolution_mode": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": "check_with_dhcid" }, "ddns_enabled": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": false }, "ddns_hostname_block": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": { "ddns_generate_name": true, "ddns_generated_prefix": "myhost" } }, "ddns_ttl_percent": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": 0 }, "ddns_update_block": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": { "ddns_domain": "http://example.com .", "ddns_send_updates": true } }, "ddns_update_on_renew": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": false }, "ddns_use_conflict_resolution": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": true }, "dhcp_config": { "abandoned_reclaim_time": { "action": "override", "display_name": "IPAM Address Block '10.0.0.0/8'", "source": "ipam/address_block/cbb6a009-c80e-11e9-8757-0a586460226b", "value": 0 }, "abandoned_reclaim_time_v6": { "action": "override", "display_name": "IPAM Address Block '10.0.0.0/8'", "source": "ipam/address_block/cbb6a009-c80e-11e9-8757-0a586460226b", "value": 0 }, "allow_unknown": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": false }, "allow_unknown_v6": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": true }, "echo_client_id": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": true }, "filters": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": [] }, "filters_v6": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": [] }, "ignore_client_uid": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": false }, "ignore_list": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": [] }, "lease_time": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": 1740 }, "lease_time_v6": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": 3600 } }, "dhcp_options": { "action": "inherit", "value": [ { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": { "option": { "group": null, "option_code": "dhcp/option_code/ebe89708-0252-11eb-bc59-a68510dc5cf0", "option_value": "12", "type": "option" }, "overriding_group": null } }, { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": { "option": { "group": null, "option_code": "dhcp/option_code/428d6b88-92c2-11ea-8ead-c28c972a2a2a", "option_value": "12", "type": "option" }, "overriding_group": null } }, { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": { "option": { "group": "dhcp/option_group/97038ca7-b0b9-11ea-a6ae-dab68f2e59ab", "option_code": null, "option_value": "", "type": "group" }, "overriding_group": null } } ] }, "header_option_filename": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": "" }, "header_option_server_address": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": "" }, "header_option_server_name": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": "" }, "hostname_rewrite_block": { "action": "inherit", "display_name": "Global DHCP Properties", "source": "dhcp/global/47425f38-a1af-11e9-b7bf-0a5864600414", "value": { "hostname_rewrite_char": "", "hostname_rewrite_enabled": true, "hostname_rewrite_regex": "[^a-zA-Z0-9.]" } } }, "name": "", "parent": "ipam/address_block/cbb6a009-c80e-11e9-8757-0a586460226b", "protocol": "ip4", "space": "ipam/ip_space/75a9ba7f-c80e-11e9-b635-0a586460298f", "tags": null, "threshold": { "enabled": false, "high": 0, "low": 0 }, "updated_at": "2024-05-03T16:50:52.930189Z", "usage": [ "IPAM" ], "utilization": { "abandon_utilization": 0, "abandoned": "0", "dynamic": "0", "free": "256", "static": "0", "total": "256", "used": "0", "utilization": 0 }, "utilization_v6": { "abandoned": "0", "dynamic": "0", "static": "0", "total": "0", "used": "0" } }}
If you use the following API syntax,
GET http://.../child/1,
it is equivalent to,
GET http://.../child/1?_inherit=none.
Use the following syntax to retrieve the values for child with full inheritance information:
GET http://.../child/1?_inherit=full
Granular Control of DHCP Inheritance
After configuring the DHCP options in an object, you can configure the inheritance for each item individually.
To configure inheritance granularly, complete the following:
From the Infoblox Portal, click Manage > IPAM/DHCP > Object_name. This can be an IP Space, Address Block, Range, or Subnet.
Click ☰ > Edit or select the respective record and click the Edit button to modify the object.
Navigate to the DHCP Options pane.
You can Inherit, Override or Block each entry independently by configuring the following options:
Block all inherited options: Clear the check box to configure inheritance granularly. Select the check box to block the values inherited from the Global DHCP Configuration.
Inherit: Inherits the value from the Global DHCP Configuration.
Override: Choose to override the inherited value and specify a custom value.
Block: Choose this option to block the DHCP option.
Modify the details and click Save & Close to save the record or click Cancel to cancel.