DHCP subnet issue

[Michele Pinassi]

Hi all,

i have strange issue with my ISC DHCP server (Internet Systems
Consortium DHCP Server 4.1.1-P1). I configure one shared network with
two subnets with MAC filtering:

class "subnet_1" {
    match pick-first-value (option dhcp-client-identifier, hardware);
}

subclass "subnet_1" 1:00:04:f2:aa:MAC1;
subclass "subnet_1" 1:cc:ef:48:5d:MAC2;
subclass "subnet_1" 1:cc:ef:48:5d:MAC3;
subclass "subnet_1" 1:cc:ef:48:5d:MAC4;

[....]

#########################################################
shared-network voip {
    subnet 172.20.0.0 netmask 255.255.0.0 {
    pool {
            range 172.20.1.10 172.20.1.250;
            option subnet-mask 255.255.255.0;
        option routers 172.20.1.1;
        allow members of "subnet_1";
    }

    pool {
            range 172.20.2.10 172.20.2.250;
            option subnet-mask 255.255.255.0;
        option routers 172.20.2.1;
        allow members of "subnet_2";
    }
    }
}

But there are some devices, like "MAC4", that were unable to get an
available IP. Logs report:

dhcpd: DHCPREQUEST for 172.20.1.16 (172.20.1.2) from cc:ef:48:5d:MAC4
via eth1
dhcpd: DHCPACK on 172.20.1.16 to cc:ef:48:5d:MAC4 via eth1
dhcpd: DHCPDISCOVER from cc:ef:48:5d:MAC4 via eth1: network
172.20.0.0/16: no free leases
dhcpd: DHCPDISCOVER from cc:ef:48:5d:MAC4 via eth1: network
172.20.0.0/16: no free leases

Any hint ?

Thanks, Michele

-- 
Michele Pinassi
Responsabile Telefonia di Ateneo
Servizio Reti, Sistemi e Sicurezza Informatica - Università degli Studi
di Siena
tel: 0577.(23)2169 - fax: 0577.(23)2053

Per trovare una soluzione rapida ai tuoi problemi tecnici
consulta le FAQ di Ateneo, http://www.faq.unisi.it
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