Subnets

The Dhcp Subnets screen lists the subnets defined in the DHCP service. Each subnet is displayed with its Description, Network, Netmask, Superscope, Range Start, Range End and Occupancy columns. The Actions column contains the buttons for operations on the relevant record.

Use the search field to filter subnets. The Copy To Clipboard and Export To CSV buttons can be used to export the list.

DHCP Subnets

Buttons

  • Add New Subnet: Opens the screen for adding a new subnet. See New Subnet for details.

  • manage ▾: A dropdown menu for managing advanced DHCP features.

    • manage superscopes: Opens the superscope management dialog.

    • manage policy groups: Opens the policy group management dialog.

    • manage failover: Opens the failover management dialog.

    • enable ip conflict detection: Toggles IP conflict detection on or off.

  • import / export ▾: A dropdown menu for configuration backup and restore operations.

    • Import DHCP: Imports a previously backed-up DHCP configuration file.

    • Export DHCP: Exports the current DHCP configuration as a file.

    • Import SambaBox DHCP: Imports a DHCP configuration backed up from another SambaBox.

    • Export SambaBox DHCP: Exports the configuration in SambaBox DHCP format.

DHCP import / export menu

  • Apply Changes: Applies any configuration changes made on the subnets screen to the DHCP service.

Warning

Configuration changes made in subnets will not take effect unless the Apply Changes button is pressed.

Manage Superscopes

A superscope is a grouping of subnets that lets the DHCP server distribute addresses from multiple IP ranges to clients on the same physical network.

Manage Superscopes

  • superscope name / description: Name and description for the new superscope. Click add superscope to save.

  • The table lists existing superscopes with their name, description and the number of subnets they contain. Use Edit to modify or Delete to remove a superscope.

Manage Policy Groups

Policy groups allow the DHCP server to apply different options (such as gateway, DNS server or lease time) to clients that match specific rules (such as MAC address or vendor class).

Manage Policy Groups

  • group name / description / priority: Name, description and priority of the new policy group. Click add policy group to save.

  • The table lists existing groups with their name, description, priority and the number of rules/options. Use Manage Rules & Options to configure the group, Edit to update its name or priority, and Delete to remove it.

Policy Group Rules and Options

Policy Group Rules and Options

Each policy group has two sections:

  • rule type: Defines the condition for the policy to apply (e.g. MAC Address). Enter the value and click add rule.

  • option name: Defines the DHCP option to send to matching clients (e.g. routers). Enter the option value and click add option.

Manage Failover

Failover allows two SambaBox DHCP servers to work together for high availability. If one server fails, the other continues to distribute IP addresses.

Manage Failover

  • enable failover: Activates DHCP failover.

  • Role: Determines whether this server acts as primary or secondary.

  • Peer Domain Controller: The other SambaBox server that will act as the failover partner.

  • This Appliance’s Detected Ip: The IP address of this server, detected automatically.

  • save: Saves the failover configuration.