different devices getting the same ip address

[Tom De Moor (VCLB Gent)]

  Hi,
i m having the following problem:
multiple Samsung Galaxy* *Gio get the same ip from our dhcp-server.
How can i resolve this?

Tom

My dhcpd.conf is

subnet 10.10.0.0 netmask 255.255.0.0 {
range 10.10.2.1 10.10.5.254;
option domain-name-servers 10.10.1.2;
option domain-name "vclbgent.be";
option routers 10.10.1.2;
default-lease-time 7200;
max-lease-time 7200;
deny duplicates;
}


In the leases file is see
lease 10.10.2.182 {
   starts 3 2011/11/30 08:02:04;
   ends 3 2011/11/30 08:36:54;
   tstp 3 2011/11/30 08:36:54;
   cltt 3 2011/11/30 08:02:04;
   binding state free;
   hardware ethernet 18:46:17:6d:dd:be;
   uid "\000K";
}

lease 10.10.2.182 {
   starts 3 2011/11/30 08:41:04;
   ends 3 2011/11/30 10:41:04;
   cltt 3 2011/11/30 08:41:04;
   binding state active;
   next binding state free;
   hardware ethernet 18:46:17:6d:dd:3e;
   uid "\000K";
}

In the logfiles i get
Nov 30 07:59:25 the-oracle dhcpd: client 18:46:17:6d:dd:52 has duplicate 
leases on 10.10.0.0/16
Nov 30 08:53:21 the-oracle dhcpd: client cc:f9:e8:12:76:50 has duplicate 
leases on 10.10.0.0/16
Nov 30 09:02:04 the-oracle dhcpd: uid lease 10.10.2.242 for client 
18:46:17:6d:dd:be is duplicate on 10.10.0.0/16
Nov 30 09:36:54 the-oracle dhcpd: client cc:f9:e8:12:76:50 has duplicate 
leases on 10.10.0.0/16