Isc Dhcpv6 server 4.3.2 - Configuration ASAP PLEASE

Hello ,

I configured the dhcp server for ipv6 and its working very well but we are facing a problem with dhcpd.leases.

We need to identify the client by mac address.
How we can specify in the dhcpd.conf this option or fix this problem.

Here it is my dhcpd.conf and leases :

authoritative;
default-lease-time 20600;
max-lease-time 7200;
log-facility local7;

#Additional options
option dhcp6.name-servers 2001:4860:4860::8888;
option dhcp6.domain-search "google.com";

shared-network LAN
{

subnet6 ipv6 adress/124{
}

subnet6 ipv address::0/64 {

range6 ipv6 adress1::10 ipv6 adress 2;
prefix6 ipv6 adresss:: /64;

}

}

Leases :

server-duid "\000\001\000\001 zP\277\000PV\235\212}";

ia-na "L\001];\000\003\000\001\\5;]\001L" {
cltt 1 2017/04/10 14:22:07;
iaaddr ipv6 address {
binding state active;
preferred-life 12875;
max-life 20600;
ends 1 2017/04/10 20:05:27;
}
}

ia-pd "L\001];\000\003\000\001\\5;]\001L" {
cltt 1 2017/04/10 14:22:07;
iaprefix ipv6 address::/64 {
binding state active;
preferred-life 12875;
max-life 20600;
ends 1 2017/04/10 20:05:27;
}
}

Thank in advance

Drinis