The ISC DHCP includes support for IPv6 (DHCPv6) since the 4.x release with a DHCPv6 server, client, and relay agent functionality. The agents support both IPv4 and IPv6, however the agents can only manage one protocol at a time; for dual support they must be started separately for IPv4 and IPv6. For example, configure both DHCPv4 and DHCPv6 by editing their respective configuration files /etc/dhcp/dhcpd.conf and /etc/dhcp/dhcpd6.conf and then issue the following commands:

~]# systemctl start dhcpd
~]# systemctl start dhcpd6

The DHCPv6 server configuration file can be found at /etc/dhcp/dhcpd6.conf.

The example server configuration file can be found at /usr/share/doc/dhcp-version/dhcpd6.conf.example.

A simple DHCPv6 server configuration file can look like this:

subnet6 2001:db8:0:1::/64 {
        range6 2001:db8:0:1::129 2001:db8:0:1::254;
        option dhcp6.name-servers fec0:0:0:1::1;
        option dhcp6.domain-search "domain.example";
}

To assign a fixed-address to a client, based on the MAC address of the network interface card, use the hardware ethernet parameter:

host otherclient {
        hardware ethernet 01:00:80:a2:55:67;
        fixed-address6 3ffe:501:ffff:100::4321;
 }

The configuration options in the shared-network, and group declaration for IPv6 are the same as IPV4. For more details, see the examples as demonstrated in Example 13.5, “Shared-network Declaration”, and Example 13.6, “Group Declaration”.