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Last update: 2021-10-21

Add a DHCPv6 server

You can configure Sophos Firewall as a DHCP server to dynamically provide IP addresses and network parameters to clients in a network.

You can also configure the server to assign static IP addresses mapped to clients' MAC addresses.

  1. Go to Network > DHCP. Under Server, click Add.
  2. Click IPv6.
  3. Enter a name.
  4. Specify the settings.

    Option Desription
    Interface Interface to use for the DHCP server. The firewall listens for DHCP queries on this interface.
    Accept client request via relay Accepts DHCP requests through a DHCP relay agent from clients belonging to a subnet that's different from the server's.
    Dynamic IP lease Ranges from which the DHCP server allocates IP addresses to clients.DHCP clients in the server's subnet: The range must belong to the same subnet as the interface.

    DHCP clients in a different subnet: When you configure DHCP relay, the relay agent's interface must belong to the clients' subnet.
    Static IP DUID mapping Static DHCP Unique Identifier-to-IP address mappings. The IP address is always assigned to the client DUID on the specified host.
    Preferred time Time, in minutes, that a valid address remains in the preferred state. When the preferred time expires, the address is deprecated. The preferred time must be less than the valid time.
    Valid time Time, in minutes, that an address remains in a valid state. During the valid state, an address can be used for new or existing communications.
  5. Specify the DNS servers you want the clients to contact. To specify Sophos Firewall as the primary and the secondary DNS server, select Use device's DNS settings. Alternatively, you can enter the IP addresses of DNS servers you want the clients to contact.

  6. Click Save.
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