dhcpd class subclass

#--------------------------------------------------------
option domain-name "tt.ru";
option domain-name-servers 10.51.8.2, 10.51.8.9;

default-lease-time 7200;
max-lease-time 14400;

authoritative;

log-facility local7; #logs
#--------------------------------------------------------
class "Phones"{
        match pick-first-value (option dhcp-client-identifier, hardware);
}
subclass "Phones" 1:cc:ef:48:5e:0b:9a;
#--------------------------------------------------------
subnet 10.51.8.0 netmask 255.255.255.0 {
        option routers 10.51.8.1;
        next-server 10.51.8.10;
#---------------------------------------------------------
        pool{
                range 10.51.8.50 10.51.8.100;
                deny unknown-clients;
                allow members of "Phones";
        }

        pool{
                range 10.51.8.101 10.51.8.255;
                allow unknown-clients;
                deny members of "Phones";
        }
}

DHCPDISCOVER from cc:ef:48:5e:0b:9a via eth0: network 10.51.8.0/24: no free leases