dhcp server helds 2 addresses

[Patrick DUBAU]

Hi,

OS  : debian etch
DHCP : dhcp3-server

i deliver ip adress by range, the problem is that the server gives 2 
addresses for the same wokstation

Here's an example of dialogue between the station and the server :

DHCPDISCOVER from 00:0e:a6:a7:3f:a4 via eth0
DHCPOFFER on 192.168.250.229 to 00:0e:a6:a7:3f:a4 via eth0
DHCPREQUEST for 192.168.250.229 (192.168.250.1) from 00:0e:a6:a7:3f:a4 
via eth0
DHCPACK on 192.168.250.229 to 00:0e:a6:a7:3f:a4 via eth0
DHCPREQUEST for 192.168.250.142 from 00:0e:a6:a7:3f:a4 via eth0
DHCPACK on 192.168.250.142 to 00:0e:a6:a7:3f:a4 (S-105-11) via eth0
DHCPREQUEST for 192.168.250.142 from 00:0e:a6:a7:3f:a4 (S-105-11) via eth0
DHCPACK on 192.168.250.142 to 00:0e:a6:a7:3f:a4 (S-105-11) via eth0

at first the server gives 192.168.250.229, but then the station claims 
192.168.250.142
=> 2 addresses are hold on server side => i use double of addresses.

i put
deny duplicates;
default-lease-time 600; (instead of 43200 at the begining)
max-lease-time 7200;
=> i have less stations with 2 addresses

Does someone has a solution ?

Notice : all the stations have boot pxe on