IPv6 and option 18

[Paolo Prandini]

I would like to use the option 18 inserted by the dhcp relay agent
(a string like "AT2/1.0") to identify an host, I tried with:

host AVM {
         host-identifier option dhcp6.interface-id "AT2/1.0";

         fixed-address6 2a00:19a8:1::2;
         fixed-prefix6 2a00:19a8:101:: /48;
}

I get no syntax errors, but even if the interface-id is correctly set ( I checked
with tcpdump ) no lease is assigned.

of course with client-id it works correcty:

host AVM {
         host-identifier option dhcp6.client-id 01:03:00:01:00:1e:be:bc:5d:c2;

         fixed-address6 2a30:19a8:1::2;
         fixed-prefix6 2a30:19a8:101:: /48;
}

Where is the fault?
Thanks a lot!

-- 
Dr.Ing.Paolo Prandini