Configure an Interface as a DHCP Relay Agent

To enable a firewall interface to transmit DHCP messages between clients and servers, you must configure the firewall as a DHCP relay agent. The interface can forward messages to a maximum of eight external IPv4 DHCP servers and eight external IPv6 DHCP servers. A client DHCPDISCOVER message is sent to all configured servers, and the DHCPOFFER message of the first server that responds is relayed back to the requesting client.
You can configure a combined total of 500 DHCP servers (IPv4) and DHCP relay agents (IPv4 and IPv6) on a firewall.
Before configuring a DHCP relay agent, make sure you have configured a Layer 3 Ethernet or Layer 3 VLAN interface, and the interface is assigned to a virtual router and a zone.
  1. Select DHCP Relay.
    Select
    Network
    DHCP
    DHCP Relay
    .
  2. Specify the IP address of each DHCP server with which the DHCP relay agent will communicate.
    1. In the
      Interface
      field, select from the drop-down the interface you want to be the DHCP relay agent.
    2. Select either
      IPv4
      or
      IPv6
      , indicating the type of DHCP server address you will specify.
    3. If you checked
      IPv4
      , in the
      DHCP Server IP Address
      field,
      Add
      the address of the DHCP server to and from which you will relay DHCP messages.
    4. If you checked
      IPv6
      , in the
      DHCP Server IPv6 Address
      field,
      Add
      the address of the DHCP server to and from which you will relay DHCP messages. If you specify a
      multicast
      address, also specify an outgoing
      Interface
      .
    5. (
      Optional
      ) Repeat the prior three steps to enter a maximum of eight DHCP server addresses per IP address family.
  3. Commit the configuration.
    Click
    OK
    and
    Commit
    .

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