Configure an IPv6 DHCP Server

DHCPv6 is a method to assign IPv6 addresses automatically to network clients. When you enable IPv6 for a trusted or optional interface, you can enable the DHCPv6 server on the interface, to assign IPv6 addresses to clients that connect.

Before you can enable the DHCPv6 server, you must enable IPv6 for the interface. For more information, see Enable IPv6 for a Trusted or Optional Interface.

You cannot use these special purpose IP addresses in the DHCPv6 configuration:

Configure DHCPv6 Server Settings

You can enable DHCPv6 for a trusted or optional interface that has IPv6 enabled.

  1. Select Network > Interfaces.
  2. Select a trusted or an optional interface. Click Edit.
  3. Select the IPv6 tab.
  4. From the DHCP drop-down list, select Use DHCP Server.
    The DHCP server configuration settings appear.

Screen shot of the IPv6 DHCP Server settings for a trusted or optional interface

Configure the DHCPv6 Address Pool

  1. In the Address Pool section of the Settings tab, click Add.
    Add Address Range dialog box appears.

Screen shot of the Add Address Range dialog box

  1. In the Starting IP and Ending IP text boxes, type two IPv6 addresses in the same prefix range as an IPv6 address configured for this interface.
  2. Click OK.

Configure DHCPv6 Reservations

To reserve a specific IP address for a client:

  1. In the Reserved Addresses section, click Add.
    The Add Reserved IP by DUID dialog box appears.

Screen shot of the Reserved IP by DUID dialog box

  1. In the Reserved IP text box, type the IPv6 address to reserve.
  2. In the Reservation Name text box, type a name for this reservation.
    The reservation name cannot start or end with a dot (.) or hyphen (-), and cannot contain an underscore. The maximum length of a reservation name is 64 characters.
  3. In the DUID text box, type the DHCPv6 Client DUID.
  4. Click OK.

Enable Rapid Commit

To get IPv6 addresses from a server, the DHCPv6 client can use a rapid two-message exchange (solicit, reply) or a four-message exchange (solicit, advertise, request, reply). By default, the DHCPv6 client uses the four-message exchange. To use the two-message exchange, you must enable the Rapid Commit option on the XTM device and on the client. Select the Rapid Commit check box to enable the DHCP server to use the rapid two-message exchange to assign an IP address.

Configure IPv6 Address Lifetimes

The IPv6 lifetime settings control the length of time an assigned IPv6 address remains valid and the length of time the address is preferred. To change the default lifetime settings. change the values for Valid Lifetime and Preferred Lifetime. The Valid Lifetime must be greater than or equal to the Preferred Lifetime.

Configure Per-Interface DHCPv6 DNS Servers

By default, when it is configured as a DHCP server, your XTM device gives out the DNS and WINS server information configured on the Network Configuration > WINS/DNS tab. To specify different information for your device to assign when it gives out IPv6 addresses, you can add DNS servers in the DHCPv6 settings for the interface.

To configure DNS servers:

  1. In the DHCP section, select the DNS tab.

Screen shot of the DHCP Server settings, DNS tab

  1. To change the default DNS domain that the DHCP client appends to unqualified host names, in the Domain Name text box type a domain name.
  2. In the text box below the DNS Servers list, type the IPv6 address of a DNS server.
  3. Click Add.

You can add the IP addresses of up to three DNS servers.

Configure DHCPv6 SIP Servers

You can add the IPv6 addresses or domain name of SIP servers to your DHCPv6 server configuration. This enables the DHCPv6 server to provide the SIP server domain name or SIP server IP addresses to SIP clients that request them. You can specify a SIP server domain name, and up to three IP addresses.

To configure SIP servers:

  1. In the DHCP section, select the DNS tab.

Screen shot of the DHCP Server settings, DNS tab

  1. To specify the SIP server domain. type the domain name in the SIP Domain Name text box.
  2. To specify a SIP server IP address, in the text box below the SIP Servers list, type the IPv6 address of a SIP server.
  3. Click Add to add the IP address to the list.

See Also

Enable IPv6 for a Trusted or Optional Interface

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