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/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";
}