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DHCP

DHCP, the abbreviation for Dynamic Host Configuration Protocol, is designed to allocate appropriate IP addresses and related network parameters for subnetworks automatically, thus reducing requirement on network administration. Besides, DHCP can avoid address conflict to assure the re-allocation of idle resources.

DHCP supports to allocate IPv4 and IPv6 addresses.

System supports DHCP client, DHCP server and DHCP relay proxy.

  • DHCP client: The interface can be configured as a DHCP client and obtain IP addresses from the DHCP server. For more information on configuring a DHCP client, see Configuring an Interface.

  • DHCP server: The interface can be configured as a DHCP server and allocate IP addresses chosen from the configured address pool for the connected hosts.

  • DHCP relay proxy: The interface can be configured as a DHCP relay proxy to obtain DHCP information from the DHCP server and forward the information to connected hosts.

The security devices are designed with all the above three DHCP functions, but an individual interface can be only configured with one of the above functions.

Configuring a DHCP Server

To create a DHCP server, take the following steps:

  1. Select Network > DHCP.
  2. Select New > DHCP Server.

  3. Configure Reserved Address ( IP addresses in the Reserved Address, within the IP range of the address pool, are reserved for the DHCP server and will not be allocated).
    To configure a reserved address, click the Reserved Address tab, type the start and end IP for an IP range into the Start IP and End IP box respectively, and then click Add. To delete an IP range, select the IP range you want to delete from the list and then click Delete.
  4. Configure IP-MAC Binding. If the IP is bound to a MAC address manually, the IP will only be allocated to the specified MAC address.
    To configure an IP-MAC Binding, click the IP-MAC Binding tab and type the IP and MAC address into the IP address and MAC box respectively, type the description in the Description text box if necessary, and then click Add. Repeat the above steps to add multiple entries. To delete an IP-MAC Binding, select an entry from the list and click Delete.
  5. Click OK.

Configuring a DHCP Relay Proxy

The device can act as a DHCP relay proxy to receive requests from a DHCP client and send requests to the DHCP server, and then obtain DHCP information from the server and return it to the client.

To create a DHCP relay proxy, take the following steps:

  1. Select Network > DHCP.
  2. Click New > DHCP Relay Proxy.

  3. In the DHCP Relay Proxy dialog, select an interface to which the DHCP Relay Proxy will be applied from the Interface drop-down list.

  4. Type the IP addresses of DHCP servers into the Server 1/Server 2/Server 3 boxes.

  5. Click OK.

Configuring a DHCPv6 Server

To create a DHCPv6 server to appropriate IPv6 addresses, take the following steps:

  1. Select Network > DHCP.
  2. Select New > DHCPv6 Server.

  3. Click OK.

Configuring a DHCPv6 Relay Proxy

The device can act as a DHCPv6 relay proxy to receive requests from a DHCPv6 client and send requests to the DHCPv6 server, and then obtain DHCP information from the server and return it to the client.

To create a DHCPv6 relay proxy, take the following steps:

  1. Select Network > DHCP.
  2. Click New > DHCPv6 Relay Proxy.

  3. In the DHCP Relay Proxy dialog, select an interface to which the DHCPv6 Relay Proxy will be applied from the Interface drop-down list.

  4. Type the IPv6 addresses of DHCPv6 servers into the Server 1/Server 2/Server 3 boxes.

  5. If the DHCPv6 server is specified as link-local address, you need to select the egress interface name from Egress Interface 1/Egress Interface 2/Egress Interface 3 dropdown list.

  6. Click OK.