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After you create IPv4 subnets, you can create address ranges and fixed addresses. A subnet is a parent network for address ranges and fixed addresses with which it is associated. You must assign an IP space when you configure an IPv4 subnet. A subnet inherits the address properties of the parent network. The exceptions are the default router and broadcast address configuration.

Viewing Subnets

To view the list of subnets, complete the following:

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

  2. Click IP Space -> Address Block. It displays the list of subnets that are associated with it.

  3. The application displays the following information:

    • ADDRESS/NAME: The IP address and netmask of the subnet.
    • DESCRIPTION: Additional information about the subnet.
    • UTILIZATION: The percentage of the total IPv4 DHCP utilization of the subnet.
      • Red: The DHCP resources are 76%-100% utilized.
      • Orange: The utilization percentage is between 51%-75%.
      • Green: The utilization percentage is between 0%-50%.

You can also use the IPAM View slider at the top of the navigation bar to toggle between the IPAM view and the DHCP view to view different information about the subnet.

To view DHCP information about the subnet, complete the following:

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

  2. Click IP Space -> Address Block -> corresponding Subnet. It displays the list of address ranges that are associated with it.

  3. User the IPAM View slider to toggle to the DHCP View. The application displays the following information:

    • ADDRESS: Displays the subnet address.
    • NAME: Displays the name of the subnet.
    • MAC ADDRESS: The MAC address of the IPv4 lease.
    • CLIENT ID: The DHCP client identifier (option 61) in an IPv4 lease. The client sends the client identifier as option 61 in the DHCP DISCOVER and REQUEST packets, as described in RFC2132, DHCP Options and BOOTP Vendor Extensions. The client identifier is either the MAC address of the network interface card requesting the address or any string uniquely identifying the client.
    • TYPE: The type of the IPv4 address.
    • DHCP FINGERPRINT: The name of the DHCP fingerprint or vendor ID of the DHCP client that was identified through DHCP fingerprint detection. For information about DHCP fingerprints, see About DHCPv4 Fingerprints.
    • LEASE START: The date and time when the lease was issued.
    • LEASE REMAINING: The time remained before the lease expires.

To view the lease usage and state of the address range in the visualization view, click the Visualization icon at the top navigation bar. The Cloud Services Portal displays the following information about the subnet:

  • Select/Deselect All: Click this check box to select all the following options or deselect all the options.
  • Abandoned: These are IP addresses that BloxOne DDI cannot lease to any devices, because a response is received when pinging the address.
  • DNS: These are IP addresses configured for DNS use.
  • Active Lease: These are IP addresses that are currently in use by a DHCP client.
  • Conflict (red): These are IP addresses that have either a MAC address conflict or a DHCP lease conflict detected through a network discovery.
  • Fixed Address (yellow): These are fixed addresses.
  • Exclusion Range: This is a range of IP addresses that BloxOne DDI does not use to assign to clients. You can use these exclusion addresses as static IP addresses.
  • DHCP Range: The IP addresses within a DHCP range in the network.
  • IPAM Range: The IP addresses within an IPAM range in the network
  • Network/Broadcast (grey): These are the network or broadcast addresses.
  • Used (blue): These addresses are currently in use.

You can also perform 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 a subnet.

  • Click -> Delete or select the respective record and click the Delete button to delete a subnet.

  • Select a subnet to view additional details. You can view the details like tags, leases, DHCP options, and filters. If you do not want to view the details in the right panel, click .

  • Click to view the subnet utilization details or click to view the details in a tabular format.

  • 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 Subnets

To create a subnet, complete the following:

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

  2. On the Create Subnet page, specify the following:

    • Address: Enter an address for the subnet and specify the netmask.  

    • Name: Enter a name for the subnet.

    • Description: Enter additional information about the subnet.

    • IP Space: Select an IP space from the drop-down list to associate a subnet. You can also create a new IP space by selecting New from the drop-down list and specifying Name and Description for the IP space.

    • On-Premises Host: Select an on-premise host from the drop-down list.

    • Tags: For information about tags, see Using Tags.

  3. Click Save & Close to save the details or click Cancel to exit.

Modifying Subnets

When you modify a subnet, you can view the leases, DHCP options, and filters that are inherited from the Global DHCP Configuration. You can override these values. For more information, see Global DHCP Configuration.

To modify a subnet, complete the following:

  1. From the Cloud Services Portal, click Manage -> IPAM/DHCP -> Address Spaces. The list of IP spaces is displayed.

  2. Click the respective IP Space -> Address Block to view the list of subnets that are associated with it.

  3. Click -> Edit or select the respective record and click the Edit button to modify a subnet.

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

Resizing DHCP Scopes

The Automated Scope Management feature provides a number of parameters to help monitor and manage your DHCP scopes. The feature allows you to set thresholds for DHCP ranges that will trigger configuration suggestions (such as proactively expanding ranges or subnets) to avoid issues associated with lack of available IP addresses. When you see an alert icon  next to your IP scopes, address blocks, or subnets, you can preview the configuration suggestions and decide which action to take. You can also resize your subnets to increase the network size and the number of IP addresses any time when necessary. For more information about the Automated Scope Management feature, see Configuring Global DHCP Properties. For information about how to resize your DHCP scopes, see Resizing DHCP Scopes.

Modifying Subnet Inheritance

To modify a subnet's inheritance, complete the following:

Leases

  1. From the Cloud Services Portal, click Manage -> IPAM/DHCP -> Address Spaces.
  2. Click -> Edit or select the respective record and click the Edit button to modify a zone.
  3. Under DHCP CONFIGURATION, click to open the Leases panel.

Overriding Lease Time

  1. In the Leases panel under the Lease Time section, slide the Inherit toggle to Override to override the default Lease time
  2. Input a numeral value in the editable field and select time period (Days, Hours, Minutes, or Seconds) from the drop-down list.
  3. Click Save & Close to save the record or click Cancel to cancel the operation.

Allow Leases for Unknown Clients

  1. To override Allow Leases for Unknown Clients, slide the Inherit toggle to Override and place a check in the checkbox.

Ignore Lease Requests from

  1. To override IGNORE LEASE REQUESTS FROM, slide the Inherit toggle to Override the default inheritance chain.
  2. Click Add to add an item type from the following drop-down list options:
  • Any Address/Network
    • From the Type drop-down list, select from the following options:
      • Client Identifier
        • In the Value field, input the desired value.
      • Client identifier (Hex-encoded)
        • In the Value field, input the desired hex-encoded value.
      • Hardware (MAC Address)
        • In the Value field, input a valid MAC address.

     3. Click Save & Close to save the record or click Cancel to cancel the operation.

DHCP Options

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

  2. Click -> Edit or select the respective record and click the Edit button to modify a zone.

  3. Under DHCP Configuration, click to open the DHCP Options panel.

DHCP Options

  1. To override DHCP Options, slide the Inherit toggle to Override the default inheritance chain.

      2. Click Add to add an item type from the following drop-down list options:

    • Option
      • In the Space field, select a space from among the choices in the drop-down menu.
      • In the Name field, select a name from the option list or conduct a search for a name using the search feature.
    • Option Group
      • In the Name field, select a name from the option list or conduct a search for a name using the search feature.

     3. Click Save & Close to save the record or click Cancel to cancel the operation.

Note

In Override mode, you can optionally click Copy Global DHCP Properties to use the global properties inheritance values.

Filters

  1. From the Cloud Services Portal, click Manage -> IPAM/DHCP -> Address Spaces.
  2. Click -> Edit or select the respective record and click the Edit button to modify a zone.
  3. Under DHCP Configuration, click to open the Filters panel.

IPv4 Filters

  1. To override Filters, slide the Inherit toggle to Override the default inheritance chain.

      2. Click Add to add an item type from the following drop-down list options:

    • Filter Name
      • in the Filter Name field, select a filter type from among the drop-down choices.

     3. Click Save & Close to save the record or click Cancel to cancel the operation.

For additional information on inheritance, see About DHCP Inheritance.

Deleting Subnets

To delete a subnet, complete the following:

  1. From the Cloud Services Portal, click Manage -> IPAM/DHCP -> Address Spaces. The list of IP spaces is displayed.

  2. Click the respective IP Space -> Address Block to view the list of subnets that are associated with it.

  3. Click  -> Delete or select the respective record and click the Delete button to delete a subnet.

  4. A confirmation message is displayed. Click Yes to delete the respective subnet.

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